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.

package com.AndroidOrientation;

import android.app.Activity;
import android.content.Context;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.OrientationEventListener;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidOrientation extends Activity{

TextView orientation;
MyOrientationEventListener myOrientationEventListener;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       orientation = (TextView)findViewById(R.id.orientation);
      
       myOrientationEventListener =
        new MyOrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL);
      
       if (myOrientationEventListener.canDetectOrientation()){
        myOrientationEventListener.enable();
       }else{
        Toast.makeText(AndroidOrientation.this,
          "Can't Detect Orientation!",
          Toast.LENGTH_LONG).show();
       }
   }
  
   @Override
protected void onDestroy() {
 // TODO Auto-generated method stub
 super.onDestroy();
 myOrientationEventListener.disable();
}

class MyOrientationEventListener extends OrientationEventListener{

 public MyOrientationEventListener(Context context, int rate) {
  super(context, rate);
  // TODO Auto-generated constructor stub
 }

 @Override
 public void onOrientationChanged(int arg0) {
  // TODO Auto-generated method stub
  orientation.setText(String.valueOf(arg0));
 }
   
   }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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>

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- Display.getRotation()