onConfigurationChanged方法监控系统更改事件

添加权限

 

<uses-permission
		android:name="android.permission.CHANGE_CONFIGURATION"></uses-permission>

 在manifest.xml中的activity中设置configuration的属性

 

<activity
			android:name=".ConfigChange"
			android:label="@string/app_name"
			android:configChanges="orientation|keyboard">
		</activity>

 代码，重写onConfigurationChanged方法

 

private Button button1;
	private int width;
	private int height;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.screen_change);

		button1 = (Button) findViewById(R.id.button1);

		button1.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				DisplayMetrics dm = new DisplayMetrics();
				getWindowManager().getDefaultDisplay().getMetrics(dm);
				width = dm.widthPixels;
				height = dm.heightPixels;
				if (width < height) {
					setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

				} else {
					setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
				}
			}

		});
	}

	public void onConfigurationChanged(Configuration newConfig){
		if(newConfig.orientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)toast("已切换为横屏");
		else{
			toast("已切换竖屏");
		}
		super.onConfigurationChanged(newConfig);
	}
	
	
	
	public void toast(String str) {
		Toast.makeText(ConfigChange.this, str, Toast.LENGTH_LONG).show();
	}