android loading界面及处理

本文转载自查看原文 2012-04-13 23:15 17025 面试/ Android-app

主要实现效果：
--------------
程序启动，进入loading界面，
loading界面显示背景图及进度条动画，
后台启动线程进行相应的初始化操作，
loading界面更新相应的初始化提示信息，
初始化完成，打开并进入主界面，关闭loading界面，
如果初始化超时，则弹出提示，退出程序。

loading.java
------------

package com.hello;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;

public class loading extends Activity {

int MSG_INIT_OK = 1;
int MSG_INIT_INFO = 2;
int MSG_INIT_TIMEOUT = 9;

boolean isTimeout = false;

TextView tvInfo ;

     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.loading);
        tvInfo = (TextView)findViewById(R.id.tvInfo);
        initSystem();

    }

     private void initSystem(){
     initThread();
     mHandler.postDelayed(timeOutTask,60000); // 60秒超时
    }


     public Handler mHandler = new Handler(){
      public void handleMessage(Message msg){
       if(msg.what == MSG_INIT_TIMEOUT){

        if (mHandler != null && timeOutTask != null ){
        mHandler.removeCallbacks(timeOutTask);
       }

       Toast.makeText(loading. this, "timeout", Toast.LENGTH_LONG).show();
       loading. this.finish();

      } else if(msg.what == MSG_INIT_OK){

        if (mHandler != null && timeOutTask != null ){
        mHandler.removeCallbacks(timeOutTask);
       }

       startActivity( new Intent(getApplication(),MainActivity. class));
                loading. this.finish();
      } else if(msg.what == MSG_INIT_INFO){

       String info = msg.obj.toString();
       tvInfo.setText(info);
      }
     }
    };

    Runnable timeOutTask = new Runnable() {
   public void run() {

   isTimeout = true;

   Message msg = Message.obtain();
   msg.what = MSG_INIT_TIMEOUT;
   mHandler.sendMessage(msg);
  }
    };

     private void initThread(){
      new Thread(){
       public void run() {
        try {
         if(!isTimeout){
         sendInitInfo("初始化 step 1");
         Thread.sleep(1000); // TODO 1
        }

         if(!isTimeout){
         sendInitInfo("初始化 step 2");
         Thread.sleep(2000); // TODO 2
        }

         if(!isTimeout){
         sendInitInfo("初始化 step 3");
         Thread.sleep(3000); // TODO 2
        }

      if(!isTimeout){
       // 初始化完成
      sendInitInfo("初始化完成");

      Message msg2 = Message.obtain();
      msg2.what = MSG_INIT_OK;
      mHandler.sendMessage(msg2);
     }

    } catch (InterruptedException e) {
      // TODO Auto-generated catch block
     e.printStackTrace();
    }
      }
     }.start();
    }

     private void sendInitInfo(String info){
     Message msg1 = Message.obtain();
  msg1.what = MSG_INIT_INFO;
  msg1.obj = info;
  mHandler.sendMessage(msg1);
    }
}

res/layout/loading.xml
----------------------

<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:layout_width ="match_parent" android:layout_height ="match_parent"
android:background ="@drawable/pf_loading_bg" android:orientation ="horizontal" >

< TableLayout android:layout_width ="match_parent"
  android:layout_height ="match_parent" >
   < TableRow >
    < ProgressBar android:id ="@+id/progressBar1"
    android:layout_width ="fill_parent" android:layout_height ="wrap_content"
    android:paddingTop ="10dip" android:paddingLeft ="70dip"
    android:paddingRight ="70dip" style ="@style/loading" >
    </ ProgressBar >
   </ TableRow >
   < TableRow >
    < TextView android:text ="TextView" android:layout_height ="wrap_content"
    android:id ="@+id/tvInfo" android:layout_width ="wrap_content" ></ TextView >
   </ TableRow >
</ TableLayout >

</ LinearLayout >

res/values/mystyle.xml
----------------------

<? xml version="1.0" encoding="utf-8" ?>
< resources >
     < style name ="loading" parent ="@android:style/Widget.ProgressBar.Large" >
         < item name ="android:indeterminateDrawable" >@anim/loading </ item >
     </ style >
</ resources >

res/anim/loading.xml
--------------------

<? xml version="1.0" encoding="utf-8" ?>
< animation-list android:oneshot ="false"
xmlns:android ="http://schemas.android.com/apk/res/android" >
< item android:duration ="100" android:drawable ="@drawable/loading1" />
< item android:duration ="100" android:drawable ="@drawable/loading2" />
< item android:duration ="100" android:drawable ="@drawable/loading3" />
</ animation-list >

res/drawable-hdpi/
-------------------
loading_bg.png ,
loading1.png , loading2.png ,loading3.png

AndroidMainfest.xml
-------------------

<? xml version="1.0" encoding="utf-8" ?>
< manifest xmlns:android ="http://schemas.android.com/apk/res/android"
      package ="com.hello"
      android:versionCode ="1"
      android:versionName ="1.0" >

     < application android:icon ="@drawable/icon" android:label ="@string/app_name" >
         < activity android:name =".MainActivity"
                  android:label ="@string/app_name" >
         </ activity >

         < activity android:name =".loading" >
             < intent-filter >
                 < action android:name ="android.intent.action.MAIN" />
                 < category android:name ="android.intent.category.LAUNCHER" />
             </ intent-filter >
         </ activity >

     </ application >
</ manifest >

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android loading界面 及 处理

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android loading界面及处理