Display.getRotation()

API level 8, Android 2.2, android.view.Display 類提供 getRotation() 函數, 它返回屏幕的“自然“旋轉方向。



測試這個功能, 需要啟用自動旋轉屏幕(Auto-rotate screen)功能.

package com.AndroidOrientation;

import android.app.Activity;
import android.content.Context;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.Display;
import android.view.OrientationEventListener;
import android.view.Surface;
import android.view.WindowManager;
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
   
   String strRotation = "";
   Display display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE))
        .getDefaultDisplay();
   switch(display.getRotation()){
   case(Surface.ROTATION_0): 
    strRotation = "Surface.ROTATION_0";
    break;
   case(Surface.ROTATION_90): 
    strRotation = "Surface.ROTATION_90";
    break;
   case(Surface.ROTATION_180): 
    strRotation = "Surface.ROTATION_180";
    break;
   case(Surface.ROTATION_270): 
    strRotation = "Surface.ROTATION_270";
    break;
   }
   
   orientation.setText(String.valueOf(
     strRotation + "\n" + 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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- OrientationEventListener(方向事件監聽器)