利用 AudioManager.getStreamVolume() 調整鈴聲音量

修改前面文章"更改鈴聲模式, AudioManager.setRingerMode()"的代碼, 添加顯示和調整鈴聲音量的功能.

package com.AndroidRinger;

import android.app.Activity;
import android.media.AudioManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidRinger extends Activity {
 
 private AudioManager audioManager;
 TextView textRingerState, textRingerVol;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button buttonRinger = (Button)findViewById(R.id.buttonringer);
        Button buttonRingerUp = (Button)findViewById(R.id.buttonringerup);
        Button buttonRingerDown = (Button)findViewById(R.id.buttonringerdown);
        textRingerState = (TextView)findViewById(R.id.textringerstate);
        textRingerVol = (TextView)findViewById(R.id.textringervolume);
        
        audioManager = (AudioManager)getSystemService(AUDIO_SERVICE);
        
        buttonRinger.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    int ringerMode = audioManager.getRingerMode();
    if(ringerMode == AudioManager.RINGER_MODE_SILENT){
     audioManager.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
    }else if (ringerMode == AudioManager.RINGER_MODE_VIBRATE){
     audioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
    }else{
     audioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
    }
    
    displayRingMode();
   }});
        
        buttonRingerUp.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    audioManager.adjustStreamVolume(AudioManager.STREAM_RING, 
      AudioManager.ADJUST_RAISE, 
      AudioManager.FLAG_ALLOW_RINGER_MODES|AudioManager.FLAG_PLAY_SOUND);
    displayRingMode();
   }});
        
        buttonRingerDown.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    audioManager.adjustStreamVolume(AudioManager.STREAM_RING, 
      AudioManager.ADJUST_LOWER, 
      AudioManager.FLAG_ALLOW_RINGER_MODES|AudioManager.FLAG_PLAY_SOUND);
    displayRingMode();
    displayRingMode();
   }});
    }
    
    @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  displayRingMode();
 }

 private void displayRingMode(){
     int ringerMode = audioManager.getRingerMode();
  if(ringerMode == AudioManager.RINGER_MODE_SILENT){
   textRingerState.setText("Ringer is Silent");
  }else if (ringerMode == AudioManager.RINGER_MODE_VIBRATE){
   textRingerState.setText("Ringer is Vibrate");
  }else{
   textRingerState.setText("Ringer is Normal");
  }
  
  int ringerVol = audioManager.getStreamVolume(AudioManager.STREAM_RING);
  textRingerVol.setText("Ringer Volume: " + String.valueOf(ringerVol));
    }
}

<?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"
    />
<Button
    android:id="@+id/buttonringer"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Change Ringer Mode"
    />
<Button
    android:id="@+id/buttonringerup"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Ringer VOL+"
    />
<Button
    android:id="@+id/buttonringerdown"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Ringer VOL-"
    />
<TextView  
    android:id="@+id/textringerstate"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/textringervolume"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>