下面是一個例子程序:
1.首先通過以下語句設置Activity為無標題和全屏模式:
Java代碼
1 // 設置為無標題欄 2 requestWindowFeature(Window.FEATURE_NO_TITLE); 3 4 // 設置為全屏模式 5 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 6 WindowManager.LayoutParams.FLAG_FULLSCREEN); 7 setContentView(R.layout.main);
2.下面給出xml文件配置,這里我們在res目錄下建立layout-land和layout-port目錄,相應的layout文件不變，比如main.xml。layout-land是橫屏的layout,layout-port是豎屏的layout，其他的不用管模擬器自動尋找
main.xml文件如下:
Java代碼
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:background="@drawable/white" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/myTextView1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textColor="@drawable/blue" android:text="the portrait" /> <Button android:id="@+id/myButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_button1" /> </LinearLayout>
這個xml文件需要在上述所說的2個文件夾下都需要放置.
3.獲取資源id的view:
Java代碼
mButton01 = (Button) findViewById(R.id.myButton1);
mTextView01 = (TextView) findViewById(R.id.myTextView1);
4.返回當前顯示Activity的顯示狀態(橫屏還是豎屏)
Java代碼
// Return the current requested orientation of the activity if (getRequestedOrientation() == -1){ mTextView01.setText(getResources().getText(R.string.str_err_1001)); }
5.設置按鈕點擊監聽器
Java代碼
/* 當點擊按鈕旋轉屏幕畫面 */ mButton01.setOnClickListener(new Button.OnClickListener() { // @Override public void onClick(View arg0) { /* 方法一：重寫getRequestedOrientation */ /* 若無法取得screenOrientation屬性 */ if (getRequestedOrientation() == -1) { /* 提示無法進行畫面旋轉功能，因無法判別Orientation */ mTextView01.setText(getResources().getText(R.string.str_err_1001)); } else { if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) { /* 若當下為橫排，則更改為豎排呈現 */ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); } else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { /* 若當下為豎排，則更改為橫排呈現 */ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); } } } }); }
6.改變屏幕顯示的函數
Java代碼
@Override public void setRequestedOrientation(int requestedOrientation) { // TODO Auto-generated method stub /* 判斷要更改的方向，以Toast提示 */ switch (requestedOrientation) { /* 更改為LANDSCAPE */ case (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE): mMakeTextToast(getResources().getText(R.string.str_msg1).toString(), false); break; /* 更改為PORTRAIT */ case (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT): mMakeTextToast(getResources().getText(R.string.str_msg2).toString(), false); break; } super.setRequestedOrientation(requestedOrientation); }
7.獲取屏幕顯示狀態
Java代碼
@Override public int getRequestedOrientation() { // TODO Auto-generated method stub /* 此重寫getRequestedOrientation方法，可取得當下屏幕的方向 */ return super.getRequestedOrientation(); }
8.通過一個Toast來顯示屏幕狀態
Java代碼
public void mMakeTextToast(String str, boolean isLong) { if (isLong == true) { Toast.makeText(EX05_22.this, str, Toast.LENGTH_LONG).show(); } else { Toast.makeText(EX05_22.this, str, Toast.LENGTH_SHORT).show(); } }
9.colors.xml文件內容:
Java代碼
<?xml version="1.0" encoding="utf-8"?> <resources> <drawable name="darkgray">#808080</drawable> <drawable name="white">#FFFFFF</drawable> <drawable name="blue">#0000FF</drawable> </resources>
10.strings.xml文件內容如下:
Java代碼
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello World, ScreenChangeEx</string> <string name="app_name"> ScreenChangeEx </string> <string name="str_button1">按我旋轉屏幕</string> <string name="str_err_1001"> 請在AndroidManifest.xml\n添加android:screenOrientation屬性 </string> <string name="str_msg1">旋轉為LANDSCAPE</string> <string name="str_msg2">旋轉為PORTRAIT</string> </resources>
11.AndroidManifest.xml文件內容:
Java代碼
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.com" android:versionCode="1" android:versionName="1.0.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".ActivityMain" android:label="@string/app_name" android:screenOrientation="landscape"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
13.程序整個ActivityMain.java文件如下:
Java代碼
import android.app.Activity; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class ActivityMain extends Activity { private TextView mTextView01; private Button mButton01; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 設置為無標題欄 requestWindowFeature(Window.FEATURE_NO_TITLE); // 設置為全屏模式 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); mButton01 = (Button) findViewById(R.id.myButton1); mTextView01 = (TextView) findViewById(R.id.myTextView1); // Return the current requested orientation of the activity if (getRequestedOrientation() == -1) { mTextView01.setText(getResources().getText(R.string.str_err_1001)); } /* 當點擊按鈕旋轉屏幕畫面 */ mButton01.setOnClickListener(new Button.OnClickListener() { // @Override public void onClick(View arg0) { /* 方法一：重寫getRequestedOrientation */ /* 若無法取得screenOrientation屬性 */ if (getRequestedOrientation() == -1) { /* 提示無法進行畫面旋轉功能，因無法判別Orientation */ mTextView01.setText(getResources().getText(R.string.str_err_1001)); } else { if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) { /* 若當下為橫排，則更改為豎排呈現 */ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); } else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { /* 若當下為豎排，則更改為橫排呈現 */ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); } } } }); } @Override public void setRequestedOrientation(int requestedOrientation) { // TODO Auto-generated method stub /* 判斷要更改的方向，以Toast提示 */ switch (requestedOrientation) { /* 更改為LANDSCAPE */ case (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE): mMakeTextToast(getResources().getText(R.string.str_msg1).toString(), false); break; /* 更改為PORTRAIT */ case (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT): mMakeTextToast(getResources().getText(R.string.str_msg2).toString(), false); break; } super.setRequestedOrientation(requestedOrientation); } @Override public int getRequestedOrientation() { // TODO Auto-generated method stub /* 此重寫getRequestedOrientation方法，可取得當下屏幕的方向 */ return super.getRequestedOrientation(); } public void mMakeTextToast(String str, boolean isLong) { if (isLong == true) { Toast.makeText(EX05_22.this, str, Toast.LENGTH_LONG).show(); } else { Toast.makeText(EX05_22.this, str, Toast.LENGTH_SHORT).show(); } } }