在Android中使用SeekBar控制音量？

Question

如何使用搜索栏准确更改我的应用的音量，而不通过我的android设备上的音量按钮控制音量？我在Android上的音量键上有单独的功能，这就是为什么我想用一个搜索栏来控制音量的原因。谁能帮帮我吗？

Answer 1

请看下面的代码。它解决了你的问题。

import android.app.Activity; 
import android.content.Context; 
import android.media.AudioManager; 
import android.os.Bundle; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 

public class TestExample extends Activity 
{ 
    /** Called when the activity is first created. */ 

    private SeekBar volumeSeekbar = null; 
    private AudioManager audioManager = null; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setVolumeControlStream(AudioManager.STREAM_MUSIC); 
     setContentView(R.layout.main); 
     initControls(); 
    } 

    private void initControls() 
    { 
     try 
     { 
      volumeSeekbar = (SeekBar)findViewById(R.id.seekBar1); 
      audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
      volumeSeekbar.setMax(audioManager 
        .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 
      volumeSeekbar.setProgress(audioManager 
        .getStreamVolume(AudioManager.STREAM_MUSIC)); 


      volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
      { 
       @Override 
       public void onStopTrackingTouch(SeekBar arg0) 
       { 
       } 

       @Override 
       public void onStartTrackingTouch(SeekBar arg0) 
       { 
       } 

       @Override 
       public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
       { 
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 
          progress, 0); 
       } 
      }); 
     } 
     catch (Exception e) 
     { 
      e.printStackTrace(); 
     } 
    } 

Answer 2

这是一个自定义View我用来调节音量。它通过滑动手指起作用，但您可以轻松改变它。

SliderView

public class SliderView extends View implements OnGestureListener, OnTouchListener { 

private int mHeight = 0; 

private int mMaxValue = 16; 
private float mDelta = 0; 
private int mColor = Color.WHITE; 
private GestureDetector mGestureDetector; 

private OnValueChangeListener mListener; 

public SliderView(Context context) { 
    super(context); 
    init(context); 
} 

public SliderView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    init(context); 
} 

public SliderView(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    init(context); 
} 

@Override 
public boolean onDown(MotionEvent e) { 
    mDelta = 0; 
    return false; 
} 

@Override 
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
    return false; 
} 

@Override 
public void onLongPress(MotionEvent e) { 
    mDelta = 0; 
} 

@Override 
public boolean onScroll(MotionEvent event1, MotionEvent event2, float distanceX, float distanceY) { 

    if (mDelta >= 1 || mDelta <= -1) { 
     if (mListener != null) { 
      mListener.onValueChanged((int) mDelta); 
     } 
     mDelta = 0; 
    } else { 
     mDelta += mMaxValue * distanceY/mHeight * 2; 
    } 
    return false; 
} 

@Override 
public void onShowPress(MotionEvent e) { 

} 

@Override 
public boolean onSingleTapUp(MotionEvent e) { 
    return false; 
} 

@Override 
public void onSizeChanged(int w, int h, int oldw, int oldh) { 
    mHeight = getHeight(); 
} 

@Override 
public boolean onTouch(View v, MotionEvent event) { 

    int action = event.getAction(); 
    if (action == MotionEvent.ACTION_DOWN) { 
     v.setBackgroundColor(Color.argb(0x33, Color.red(mColor), Color.green(mColor), 
       Color.blue(mColor))); 
    } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) { 
     v.setBackgroundColor(Color.TRANSPARENT); 
    } 
    mGestureDetector.onTouchEvent(event); 
    return true; 
} 

public void setColor(int color) { 
    mColor = color; 
} 

public void setMax(int max) { 
    mMaxValue = max; 
} 

public void setOnValueChangeListener(OnValueChangeListener listener) { 
    mListener = listener; 
} 

private void init(Context context) { 
    setOnTouchListener(this); 
    mGestureDetector = new GestureDetector(context, this); 
    mHeight = getHeight(); 
} 

public interface OnValueChangeListener { 

    void onValueChanged(int value); 
    } 

} 

使用它 - 确保你实现OnValueChangeListener。

SliderView mSlider; 
mSlider= (SliderView) findViewById(id); 
mSlider.setOnValueChangeListener(this); 
mSlider.setMax(mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 

这不完全是你要求的，但它肯定会帮助你，我想。

Answer 3

@CommonsWare做这样的https://github.com/commonsguy/cw-omnibus/tree/master/SystemServices/Volume，还可以设置使用搜索栏

处理五种不同类型的卷

/*** 
    Copyright (c) 2008-2012 CommonsWare, LLC 
    Licensed under the Apache License, Version 2.0 (the "License"); you may not 
    use this file except in compliance with the License. You may obtain a copy 
    of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required 
    by applicable law or agreed to in writing, software distributed under the 
    License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS 
    OF ANY KIND, either express or implied. See the License for the specific 
    language governing permissions and limitations under the License. 

    From _The Busy Coder's Guide to Android Development_ 
    http://commonsware.com/Android 
*/ 

package com.commonsware.android.syssvc.volume; 

import android.app.Activity; 
import android.content.Context; 
import android.media.AudioManager; 
import android.os.Bundle; 
import android.widget.SeekBar; 

public class Volumizer extends Activity { 
    SeekBar alarm=null; 
    SeekBar music=null; 
    SeekBar ring=null; 
    SeekBar system=null; 
    SeekBar voice=null; 
    AudioManager mgr=null; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    mgr=(AudioManager)getSystemService(Context.AUDIO_SERVICE); 

    alarm=(SeekBar)findViewById(R.id.alarm); 
    music=(SeekBar)findViewById(R.id.music); 
    ring=(SeekBar)findViewById(R.id.ring); 
    system=(SeekBar)findViewById(R.id.system); 
    voice=(SeekBar)findViewById(R.id.voice); 

    initBar(alarm, AudioManager.STREAM_ALARM); 
    initBar(music, AudioManager.STREAM_MUSIC);//for Volume this is neccessary 
    initBar(ring, AudioManager.STREAM_RING); 
    initBar(system, AudioManager.STREAM_SYSTEM); 
    initBar(voice, AudioManager.STREAM_VOICE_CALL); 
    } 

    private void initBar(SeekBar bar, final int stream) { 
    bar.setMax(mgr.getStreamMaxVolume(stream)); 
    bar.setProgress(mgr.getStreamVolume(stream)); 

    bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
     public void onProgressChanged(SeekBar bar, int progress, 
            boolean fromUser) { 
     mgr.setStreamVolume(stream, progress, 
          AudioManager.FLAG_PLAY_SOUND); 
     } 

     public void onStartTrackingTouch(SeekBar bar) { 
     // no-op 
     } 

     public void onStopTrackingTouch(SeekBar bar) { 
     // no-op 
     } 
    }); 
    } 
} 

并为五类卷仅控制音量只使用
music=(SeekBar)findViewById(R.id.music);和initBar(music, AudioManager.STREAM_MUSIC);