OrientationEventListener(方向事件監聽器)



OrientationEventListener(方向事件監聽器)是一個當方向發生變化時, 從 SensorManager(傳感器管理程序)接收通知的輔助類. ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 packagecom.AndroidOrientation; importandroid.app.Activity; importandroid.content.Context; importandroid.hardware.SensorManager; importandroid.os.Bundle; importandroid.view.OrientationEventListener; importandroid.widget.TextView; importandroid.widget.Toast; publicclass AndroidOrientation extendsActivity{ TextView orientation; MyOrientationEventListener myOrientationEventListener; /** Called when the activity is first created. */ @Override publicvoid onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); orientation = (TextView)findViewById(R.id.orientation); myOrientationEventListener = newMyOrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL); if(myOrientationEventListener.canDetectOrientation()){ myOrientationEventListener.enable(); }else{ Toast.makeText(AndroidOrientation.this, "Can't Detect Orientation!", Toast.LENGTH_LONG).show(); } } @Override protectedvoid onDestroy() { // TODO Auto-generated method stub super.onDestroy(); myOrientationEventListener.disable(); } classMyOrientationEventListener extendsOrientationEventListener{ publicMyOrientationEventListener(Context context, intrate) { super(context, rate); // TODO Auto-generated constructor stub } @Override publicvoid onOrientationChanged(intarg0) { // TODO Auto-generated method stub orientation.setText(String.valueOf(arg0)); } } } ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 <?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <TextView android:id="@+id/orientation" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>