微信的高仿界面

在上一篇博客中，我大概的復制了一下這份源代，可能沒有怎么說清楚，在這一篇代碼中，我來仔細的幫大家把微信的高仿界面說明白：

（本人用的編譯環境是Android Studio1.0版本的，用的是Android4.4.4的SDK）

這就是我已經寫好的微信高仿界面，好了，說了那么都多，開始寫我們的代碼吧：

首先，我們要新建一個項目隨便叫做WeChatSimple，我們需要在menu文件里面的xml文件編譯一下，具體代碼如下:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.wechatsample.MainActivity" >

    <item
        android:id="@+id/action_search"
        android:actionViewClass="android.widget.SearchView"
        android:icon="@drawable/actionbar_search_icon"
        android:showAsAction="ifRoom|collapseActionView"
        android:title="@string/action_search"/>
    <item
        android:id="@+id/action_plus"
        android:actionProviderClass="com.example.wechatsample.PlusActionProvider"
        android:icon="@drawable/actionbar_add_icon"
        android:showAsAction="ifRoom"
        android:title="@string/action_plus"/>
    <item
        android:id="@+id/action_album"
        android:icon="@drawable/ofm_photo_icon"
        android:title="@string/action_album"/>
    <item
        android:id="@+id/action_collection"
        android:icon="@drawable/ofm_collect_icon"
        android:title="@string/action_collection"/>
    <item
        android:id="@+id/action_card"
        android:icon="@drawable/ofm_card_icon"
        android:title="@string/action_card"/>
    <item
        android:id="@+id/action_settings"
        android:icon="@drawable/ofm_setting_icon"
        android:title="@string/action_settings"/>
    <item
        android:id="@+id/action_feed"
        android:icon="@drawable/ofm_feedback_icon"
        android:title="@string/action_feed"/>

</menu>

當然，我們需要修改一下String文件里的代碼：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">微信</string>
    <string name="action_search">搜索</string>
    <string name="action_plus">功能</string>
    <string name="action_album">我的相冊</string>
    <string name="action_collection">我的收藏</string>
    <string name="action_card">我的銀行卡</string>
    <string name="action_settings">設置</string>
    <string name="action_feed">意見反饋</string>
    <string name="plus_group_chat">發起群聊</string>
    <string name="plus_add_friend">添加朋友</string>
    <string name="plus_video_chat">視頻聊天</string>
    <string name="plus_scan">掃一掃</string>
    <string name="plus_take_photo">拍照分享</string>
</resources>

 

其中里面的圖片都是我已經之前准備好了大家可以在我的這篇博客的最后下載我的源文件進行查看；好了，我們已經寫完了menu文件里的xml文了，接下來會發現里面有一個自定義的Action Provider，叫作PlusActionProvider。這個主要是用於模擬微信中那個加號的子菜單的，下面我們就來實現這個類，代碼如下：

package com.example.wechatsample;

import android.content.Context;
import android.view.ActionProvider;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.SubMenu;
import android.view.View;
/**
 * author :liu Zhenlong
 *
 * time:2014/12/21
 * */

public class PlusActionProvider extends ActionProvider {

    private Context context;

    public PlusActionProvider(Context context) {
        super(context);
        this.context = context;
    }

    @Override
    public View onCreateActionView() {
        return null;
    }

    @Override
    public void onPrepareSubMenu(SubMenu subMenu) {
        subMenu.clear();
        subMenu.add(context.getString(R.string.plus_group_chat))
                .setIcon(R.drawable.ofm_group_chat_icon)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        return true;
                    }
                });
        subMenu.add(context.getString(R.string.plus_add_friend))
                .setIcon(R.drawable.ofm_add_icon)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        return false;
                    }
                });
        subMenu.add(context.getString(R.string.plus_video_chat))
                .setIcon(R.drawable.ofm_video_icon)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        return false;
                    }
                });
        subMenu.add(context.getString(R.string.plus_scan))
                .setIcon(R.drawable.ofm_qrcode_icon)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        return false;
                    }
                });
        subMenu.add(context.getString(R.string.plus_take_photo))
                .setIcon(R.drawable.ofm_camera_icon)
                .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        return false;
                    }
                });
    }

    @Override
    public boolean hasSubMenu() {
        return true;
    }

}

這樣，我們的加號所形成的下拉列表就基本OK，（雖然我在這里面定義了點擊事件，但是並沒有什么具體的用處，我們只是在寫微信的界面而已，不需要實現具體的功能）

好了，上面的代碼學過Android的人都會覺得十分好理解，現在我們就看是寫MainActivity里面的代碼了：

package com.example.wechatsample;

/**
 *  author : LiuZhenlong
 * 
 * time: 2014/12/21
 * **/

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Menu;
import android.view.ViewConfiguration;
import android.view.Window;
import com.example.wechatsample.astuetz.PagerSlidingTabStrip;


public class MainActivity extends FragmentActivity {

    /**
     * 聊天界面的Fragment
     */
    private ChatFragment chatFragment;

    /**
     * 發現界面的Fragment
     */
    private FoundFragment foundFragment;

    /**
     * 通訊錄界面的Fragment
     */
    private ContactsFragment contactsFragment;

    /**
     * PagerSlidingTabStrip的實例
     */
    private PagerSlidingTabStrip tabs;

    /**
     * 獲取當前屏幕的密度
     */
    private DisplayMetrics dm;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setOverflowShowingAlways();
        dm = getResources().getDisplayMetrics();
        ViewPager pager = (ViewPager) findViewById(R.id.pager);
        tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
        tabs.setViewPager(pager);
        setTabsValue();
    }

    /**
     * 對PagerSlidingTabStrip的各項屬性進行賦值。
     */
    private void setTabsValue() {
        // 設置Tab是自動填充滿屏幕的
        tabs.setShouldExpand(true);
        // 設置Tab的分割線是透明的
        tabs.setDividerColor(Color.TRANSPARENT);
        // 設置Tab底部線的高度
        tabs.setUnderlineHeight((int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 1, dm));
        // 設置Tab Indicator的高度
        tabs.setIndicatorHeight((int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 4, dm));
        // 設置Tab標題文字的大小
        tabs.setTextSize((int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_SP, 16, dm));
        // 設置Tab Indicator的顏色
        tabs.setIndicatorColor(Color.parseColor("#45c01a"));
        // 設置選中Tab文字的顏色 (這是我自定義的一個方法)
        tabs.setSelectedTextColor(Color.parseColor("#45c01a"));
        // 取消點擊Tab時的背景色
        tabs.setTabBackground(0);
    }

    public class MyPagerAdapter extends FragmentPagerAdapter {

        public MyPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        private final String[] titles = {"聊天", "發現", "通訊錄"};

        @Override
        public CharSequence getPageTitle(int position) {
            return titles[position];
        }

        @Override
        public int getCount() {
            return titles.length;
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    if (chatFragment == null) {
                        chatFragment = new ChatFragment();
                    }
                    return chatFragment;
                case 1:
                    if (foundFragment == null) {
                        foundFragment = new FoundFragment();
                    }
                    return foundFragment;
                case 2:
                    if (contactsFragment == null) {
                        contactsFragment = new ContactsFragment();
                    }
                    return contactsFragment;
                default:
                    return null;
            }
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onMenuOpened(int featureId, Menu menu) {
        if (featureId == Window.FEATURE_ACTION_BAR && menu != null) {
            if (menu.getClass().getSimpleName().equals("MenuBuilder")) {
                try {
                    Method m = menu.getClass().getDeclaredMethod(
                            "setOptionalIconsVisible", Boolean.TYPE);
                    m.setAccessible(true);
                    m.invoke(menu, true);
                } catch (Exception e) {
                }
            }
        }
        return super.onMenuOpened(featureId, menu);
    }

    private void setOverflowShowingAlways() {
        try {
            ViewConfiguration config = ViewConfiguration.get(this);
            Field menuKeyField = ViewConfiguration.class
                    .getDeclaredField("sHasPermanentMenuKey");
            menuKeyField.setAccessible(true);
            menuKeyField.setBoolean(config, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 到了現在，我們已經把ActionBar給寫好了，但是你運行看看發現還是會有很大的差異，因為我們的字體大小什么的都還沒有定義，所以自然不怎么像，所以，自然而然我們也可以去Vaule里面的Style。xml文件里面去看看編譯一下，具體的代碼如下：

Styles:

<resources>

    <!--
        Base application theme, dependent on API level. This theme is replaced
        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
    -->
    <style name="AppBaseTheme" parent="android:Theme.Light">
        <!--
            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        -->
    </style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme">
        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    </style>

</resources>

 

attrs.xml文件里的代碼：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="PagerSlidingTabStrip">
        <attr name="pstsIndicatorColor" format="color" />
        <attr name="pstsUnderlineColor" format="color" />
        <attr name="pstsDividerColor" format="color" />
        <attr name="pstsIndicatorHeight" format="dimension" />
        <attr name="pstsUnderlineHeight" format="dimension" />
        <attr name="pstsDividerPadding" format="dimension" />
        <attr name="pstsTabPaddingLeftRight" format="dimension" />
        <attr name="pstsScrollOffset" format="dimension" />
        <attr name="pstsTabBackground" format="reference" />
        <attr name="pstsShouldExpand" format="boolean" />
        <attr name="pstsTextAllCaps" format="boolean" />
    </declare-styleable>

</resources>

 

color.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="background_tab_pressed">#6633B5E5</color>
</resources>

 

在這里面，我們將顏色什么的都已經定義好了，接下來，我們就需要修改一下AndroidMainfest.java里面的代碼，對文件進行一個注冊，代碼如下：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.wechatsample" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:logo="@drawable/logo">

        <activity
            android:name="com.example.wechatsample.MainActivity"
            android:label="@string/app_name"
            android:logo="@drawable/logo">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

寫到這里的時候讀者們可以去試着跑一下你們的代碼，你們會發下你們寫的微信頭部幾乎就可以以假亂真了，如果你們完成了，說明大家的ActionBar學的還是很不錯的，但是，我們的任務還沒有結束哦，

我們的三個界面還沒有做出來呢，至少我們不能讓三個界面都是一樣的吧，下面的聊天、發現、通訊錄這三個Tab我們還沒做呢。如此高端大氣上檔次的功能是不能就這么放過的，因此下面我們就來探究一下如何才能實現微信那樣的Tab效果，所以我們的任務還有很大：

首先，我們要寫出三個界面對吧，大家首先想到的方法是什么？沒錯，就是我們一個很重要的一節Fragment對吧

好的，廢話不多說了，讓我們就繼續：

　　這里我們介紹一個java程序PagerSlidingTabStrip，PagerSlidingTabStrip是GitHub上的一個開源框架，由Andreas Stuetz編寫，它可以完成和ActionBar Tab基本類似的功能，不過由於是完全開源的，我們可以隨意修改其中的代碼，因而擴展性非常好。由於PagerSlidingTabStrip有將近八百行的代碼，大家不要畏懼，代碼多我們只需要修改就好，慢慢來：

package com.example.wechatsample.astuetz;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Typeface;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.Locale;

import com.example.wechatsample.R;

public class PagerSlidingTabStrip extends HorizontalScrollView {

    public interface IconTabProvider {
        public int getPageIconResId(int position);
    }

    // @formatter:off
    private static final int[] ATTRS = new int[] {
            android.R.attr.textSize,
            android.R.attr.textColor
    };
    // @formatter:on

    private LinearLayout.LayoutParams defaultTabLayoutParams;
    private LinearLayout.LayoutParams expandedTabLayoutParams;

    private final PageListener pageListener = new PageListener();
    public OnPageChangeListener delegatePageListener;

    private LinearLayout tabsContainer;
    private ViewPager pager;

    private int tabCount;

    private int currentPosition = 0;
    private int selectedPosition = 0;
    private float currentPositionOffset = 0f;

    private Paint rectPaint;
    private Paint dividerPaint;

    private int indicatorColor = 0xFF666666;
    private int underlineColor = 0x1A000000;
    private int dividerColor = 0x1A000000;

    private boolean shouldExpand = false;
    private boolean textAllCaps = true;

    private int scrollOffset = 52;
    private int indicatorHeight = 8;
    private int underlineHeight = 2;
    private int dividerPadding = 12;
    private int tabPadding = 24;
    private int dividerWidth = 1;

    private int tabTextSize = 12;
    private int tabTextColor = 0xFF666666;
    private int selectedTabTextColor = 0xFF666666;
    private Typeface tabTypeface = null;
    private int tabTypefaceStyle = Typeface.NORMAL;

    private int lastScrollX = 0;

    private int tabBackgroundResId = R.drawable.background_tab;

    private Locale locale;

    public PagerSlidingTabStrip(Context context) {
        this(context, null);
    }

    public PagerSlidingTabStrip(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        setFillViewport(true);
        setWillNotDraw(false);

        tabsContainer = new LinearLayout(context);
        tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
        tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        addView(tabsContainer);

        DisplayMetrics dm = getResources().getDisplayMetrics();

        scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);
        indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);
        underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);
        dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm);
        tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm);
        dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
        tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);

        // get system attrs (android:textSize and android:textColor)

        TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);

        tabTextSize = a.getDimensionPixelSize(0, tabTextSize);
        tabTextColor = a.getColor(1, tabTextColor);

        a.recycle();

        // get custom attrs

        a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip);

        indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);
        underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor);
        dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);
        indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight);
        underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight);
        dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding);
        tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding);
        tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId);
        shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);
        scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset);
        textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);

        a.recycle();

        rectPaint = new Paint();
        rectPaint.setAntiAlias(true);
        rectPaint.setStyle(Style.FILL);

        dividerPaint = new Paint();
        dividerPaint.setAntiAlias(true);
        dividerPaint.setStrokeWidth(dividerWidth);

        defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f);

        if (locale == null) {
            locale = getResources().getConfiguration().locale;
        }
    }

    public void setViewPager(ViewPager pager) {
        this.pager = pager;

        if (pager.getAdapter() == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }

        pager.setOnPageChangeListener(pageListener);

        notifyDataSetChanged();
    }

    public void setOnPageChangeListener(OnPageChangeListener listener) {
        this.delegatePageListener = listener;
    }

    public void notifyDataSetChanged() {

        tabsContainer.removeAllViews();

        tabCount = pager.getAdapter().getCount();

        for (int i = 0; i < tabCount; i++) {

            if (pager.getAdapter() instanceof IconTabProvider) {
                addIconTab(i, ((IconTabProvider) pager.getAdapter()).getPageIconResId(i));
            } else {
                addTextTab(i, pager.getAdapter().getPageTitle(i).toString());
            }

        }

        updateTabStyles();

        getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                getViewTreeObserver().removeGlobalOnLayoutListener(this);
                currentPosition = pager.getCurrentItem();
                scrollToChild(currentPosition, 0);
            }
        });

    }

    private void addTextTab(final int position, String title) {

        TextView tab = new TextView(getContext());
        tab.setText(title);
        tab.setGravity(Gravity.CENTER);
        tab.setSingleLine();
        addTab(position, tab);
    }

    private void addIconTab(final int position, int resId) {

        ImageButton tab = new ImageButton(getContext());
        tab.setImageResource(resId);

        addTab(position, tab);

    }

    private void addTab(final int position, View tab) {
        tab.setFocusable(true);
        tab.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                pager.setCurrentItem(position);
            }
        });

        tab.setPadding(tabPadding, 0, tabPadding, 0);
        tabsContainer.addView(tab, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams);
    }

    private void updateTabStyles() {

        for (int i = 0; i < tabCount; i++) {

            View v = tabsContainer.getChildAt(i);

            v.setBackgroundResource(tabBackgroundResId);

            if (v instanceof TextView) {

                TextView tab = (TextView) v;
                tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
                tab.setTypeface(tabTypeface, tabTypefaceStyle);
                tab.setTextColor(tabTextColor);

                // setAllCaps() is only available from API 14, so the upper case is made manually if we are on a
                // pre-ICS-build
                if (textAllCaps) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
                        tab.setAllCaps(true);
                    } else {
                        tab.setText(tab.getText().toString().toUpperCase(locale));
                    }
                }
                if (i == selectedPosition) {
                    tab.setTextColor(selectedTabTextColor);
                }
            }
        }

    }

    private void scrollToChild(int position, int offset) {

        if (tabCount == 0) {
            return;
        }

        int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;

        if (position > 0 || offset > 0) {
            newScrollX -= scrollOffset;
        }

        if (newScrollX != lastScrollX) {
            lastScrollX = newScrollX;
            scrollTo(newScrollX, 0);
        }

    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (isInEditMode() || tabCount == 0) {
            return;
        }

        final int height = getHeight();

        // draw underline
        rectPaint.setColor(underlineColor);
        canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), height, rectPaint);

        // draw indicator line
        rectPaint.setColor(indicatorColor);

        // default: line below current tab
        View currentTab = tabsContainer.getChildAt(currentPosition);
        float lineLeft = currentTab.getLeft();
        float lineRight = currentTab.getRight();

        // if there is an offset, start interpolating left and right coordinates between current and next tab
        if (currentPositionOffset > 0f && currentPosition < tabCount - 1) {

            View nextTab = tabsContainer.getChildAt(currentPosition + 1);
            final float nextTabLeft = nextTab.getLeft();
            final float nextTabRight = nextTab.getRight();

            lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft);
            lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight);
        }

        canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, rectPaint);

        // draw divider

        dividerPaint.setColor(dividerColor);
        for (int i = 0; i < tabCount - 1; i++) {
            View tab = tabsContainer.getChildAt(i);
            canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(), height - dividerPadding, dividerPaint);
        }
    }

    private class PageListener implements OnPageChangeListener {

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            currentPosition = position;
            currentPositionOffset = positionOffset;

            scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth()));

            invalidate();

            if (delegatePageListener != null) {
                delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            if (state == ViewPager.SCROLL_STATE_IDLE) {
                scrollToChild(pager.getCurrentItem(), 0);
            }

            if (delegatePageListener != null) {
                delegatePageListener.onPageScrollStateChanged(state);
            }
        }

        @Override
        public void onPageSelected(int position) {
            selectedPosition = position;
            updateTabStyles();
            if (delegatePageListener != null) {
                delegatePageListener.onPageSelected(position);
            }
        }

    }

    public void setIndicatorColor(int indicatorColor) {
        this.indicatorColor = indicatorColor;
        invalidate();
    }

    public void setIndicatorColorResource(int resId) {
        this.indicatorColor = getResources().getColor(resId);
        invalidate();
    }

    public int getIndicatorColor() {
        return this.indicatorColor;
    }

    public void setIndicatorHeight(int indicatorLineHeightPx) {
        this.indicatorHeight = indicatorLineHeightPx;
        invalidate();
    }

    public int getIndicatorHeight() {
        return indicatorHeight;
    }

    public void setUnderlineColor(int underlineColor) {
        this.underlineColor = underlineColor;
        invalidate();
    }

    public void setUnderlineColorResource(int resId) {
        this.underlineColor = getResources().getColor(resId);
        invalidate();
    }

    public int getUnderlineColor() {
        return underlineColor;
    }

    public void setDividerColor(int dividerColor) {
        this.dividerColor = dividerColor;
        invalidate();
    }

    public void setDividerColorResource(int resId) {
        this.dividerColor = getResources().getColor(resId);
        invalidate();
    }

    public int getDividerColor() {
        return dividerColor;
    }

    public void setUnderlineHeight(int underlineHeightPx) {
        this.underlineHeight = underlineHeightPx;
        invalidate();
    }

    public int getUnderlineHeight() {
        return underlineHeight;
    }

    public void setDividerPadding(int dividerPaddingPx) {
        this.dividerPadding = dividerPaddingPx;
        invalidate();
    }

    public int getDividerPadding() {
        return dividerPadding;
    }

    public void setScrollOffset(int scrollOffsetPx) {
        this.scrollOffset = scrollOffsetPx;
        invalidate();
    }

    public int getScrollOffset() {
        return scrollOffset;
    }

    public void setShouldExpand(boolean shouldExpand) {
        this.shouldExpand = shouldExpand;
        notifyDataSetChanged();
    }

    public boolean getShouldExpand() {
        return shouldExpand;
    }

    public boolean isTextAllCaps() {
        return textAllCaps;
    }

    public void setAllCaps(boolean textAllCaps) {
        this.textAllCaps = textAllCaps;
    }

    public void setTextSize(int textSizePx) {
        this.tabTextSize = textSizePx;
        updateTabStyles();
    }

    public int getTextSize() {
        return tabTextSize;
    }

    public void setTextColor(int textColor) {
        this.tabTextColor = textColor;
        updateTabStyles();
    }

    public void setTextColorResource(int resId) {
        this.tabTextColor = getResources().getColor(resId);
        updateTabStyles();
    }

    public int getTextColor() {
        return tabTextColor;
    }

    public void setSelectedTextColor(int textColor) {
        this.selectedTabTextColor = textColor;
        updateTabStyles();
    }

    public void setSelectedTextColorResource(int resId) {
        this.selectedTabTextColor = getResources().getColor(resId);
        updateTabStyles();
    }

    public int getSelectedTextColor() {
        return selectedTabTextColor;
    }

    public void setTypeface(Typeface typeface, int style) {
        this.tabTypeface = typeface;
        this.tabTypefaceStyle = style;
        updateTabStyles();
    }

    public void setTabBackground(int resId) {
        this.tabBackgroundResId = resId;
        updateTabStyles();
    }

    public int getTabBackground() {
        return tabBackgroundResId;
    }

    public void setTabPaddingLeftRight(int paddingPx) {
        this.tabPadding = paddingPx;
        updateTabStyles();
    }

    public int getTabPaddingLeftRight() {
        return tabPadding;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState savedState = (SavedState) state;
        super.onRestoreInstanceState(savedState.getSuperState());
        currentPosition = savedState.currentPosition;
        requestLayout();
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.currentPosition = currentPosition;
        return savedState;
    }

    static class SavedState extends BaseSavedState {
        int currentPosition;

        public SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            currentPosition = in.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(currentPosition);
        }

        public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }

}

 

完成了上訴步驟后，修改activity_main.xml.xml(也就是MainActivity對應的布局文件)中的代碼：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.wechatsample.astuetz.PagerSlidingTabStrip
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="40dp" />

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tabs" />

</RelativeLayout>

 

接着創建ChatFragment、FoundFragment和ContactsFragment，分別對應着聊天、發現、通訊錄這三個界面，Fragment中只需放置一個TextView用於表示這個界面即可：

ChatFragment：

package com.example.wechatsample;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.FrameLayout.LayoutParams;

public class ChatFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        FrameLayout fl = new FrameLayout(getActivity());
        fl.setLayoutParams(params);
        DisplayMetrics dm = getResources().getDisplayMetrics();
        final int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, dm);
        TextView v = new TextView(getActivity());
        params.setMargins(margin, margin, margin, margin);
        v.setLayoutParams(params);
        v.setLayoutParams(params);
        v.setGravity(Gravity.CENTER);
        v.setText("聊天界面");
        v.setTextSize((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, dm));
        fl.addView(v);
        return fl;
    }
}

 

FoundFragment：

package com.example.wechatsample;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.FrameLayout.LayoutParams;


public class FoundFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        FrameLayout fl = new FrameLayout(getActivity());
        fl.setLayoutParams(params);
        DisplayMetrics dm = getResources().getDisplayMetrics();
        final int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, dm);
        TextView v = new TextView(getActivity());
        params.setMargins(margin, margin, margin, margin);
        v.setLayoutParams(params);
        v.setLayoutParams(params);
        v.setGravity(Gravity.CENTER);
        v.setText("發現界面");
        v.setTextSize((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, dm));
        fl.addView(v);
        return fl;
    }
}

 

ContactsFragment

package com.example.wechatsample;

/**
 * Created by Liu Zhenlong on 2014/12/16.
 */
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.FrameLayout.LayoutParams;


public class ContactsFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        FrameLayout fl = new FrameLayout(getActivity());
        fl.setLayoutParams(params);
        DisplayMetrics dm = getResources().getDisplayMetrics();
        final int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, dm);
        TextView v = new TextView(getActivity());
        params.setMargins(margin, margin, margin, margin);
        v.setLayoutParams(params);
        v.setLayoutParams(params);
        v.setGravity(Gravity.CENTER);
        v.setText("通訊錄界面");
        v.setTextSize((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, dm));
        fl.addView(v);
        return fl;
    }
}

 

寫到這里，我們的的=微信界面幾乎寫完了，在這里，我來貼幾張圖片，大家看看是不是很像呢：

 

好了，我們這次的Android就寫到這里了，大家看了有疑問就請留言，盡量解答.....

 

如果大家要源代碼的話我們就請來這個鏈接里面下載吧

http://pan.baidu.com/s/1kTkjRSF