Android 代码监控apk安装，卸载，轮换

public class GetBroadcast extends BroadcastReceiver {	private static GetBroadcast mReceiver = new GetBroadcast();	private static IntentFilter mIntentFilter;	public static void registerReceiver(Context context) {		mIntentFilter = new IntentFilter();		mIntentFilter.addDataScheme("package");		mIntentFilter.addAction(Intent.ACTION_PACKAGE_ADDED);		mIntentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);		mIntentFilter.addAction(Intent.ACTION_PACKAGE_REPLACED);		context.registerReceiver(mReceiver, mIntentFilter);	}	public static void unregisterReceiver(Context context) {		context.unregisterReceiver(mReceiver);	}	@Override	public void onReceive(Context context, Intent intent) {		String action = intent.getAction();		if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {			Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show();		} else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) {			Toast.makeText(context, "有应用被删除", Toast.LENGTH_LONG).show();		}		/*		 * else if(Intent.ACTION_PACKAGE_CHANGED.equals(action)){		 * Toast.makeText(context, "有应用被改变", Toast.LENGTH_LONG).show(); }		 */		else if (Intent.ACTION_PACKAGE_REPLACED.equals(action)) {			Toast.makeText(context, "有应用被替换", Toast.LENGTH_LONG).show();		}		/*		 * else if(Intent.ACTION_PACKAGE_RESTARTED.equals(action)){		 * Toast.makeText(context, "有应用被重启", Toast.LENGTH_LONG).show(); }		 */		/*		 * else if(Intent.ACTION_PACKAGE_INSTALL.equals(action)){		 * Toast.makeText(context, "有应用被安装", Toast.LENGTH_LONG).show(); }		 */	}}