使用SeekBar来控制android中的音量？

时间：2012-04-13 01:58:32

标签： android volume seekbar android-audiomanager

如何使用搜索栏准确更改应用程序的音量，而无需通过Android设备上的音量按钮控制音量？我在我的android上的音量键上有单独的功能，这就是为什么我想使用搜索栏来控制音量。有人可以帮帮我吗？

7 个答案:

答案 0 :(得分：89)

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();
        }
    }

答案 1 :(得分：3)

这是我用来调整音量的自定义View。它可以通过向上滑动手指来起作用，但您可以轻松改变它。

<强> 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 - 确保您实施OnValueChangeListener。

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

这不完全是你所要求的，但我认为它肯定会帮助你。

答案 2 :(得分：3)

@CommonsWare 在https://github.com/commonsguy/cw-omnibus/tree/master/SystemServices/Volume中执行此操作，并使用SeekBar设置五种类型的卷

处理五种不同类型的音量 

/***
  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
      }
    });
  }
}

仅用于控制音量仅使用
music=(SeekBar)findViewById(R.id.music);和initBar(music, AudioManager.STREAM_MUSIC);

答案 3 :(得分：0)

我为您添加了一些清晰的注释，以便您了解每一行的逻辑！

MediaPlayer mediaPlayer;
AudioManager audioManager;
//start the video when clicked.
public void pButton(View view){
    mediaPlayer.start();
}
//pause the audio when clicked.
public void pause(View view){
    mediaPlayer.pause();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //definning the audio manager as an audio service.
    audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
    //setting an integer with the value of the max volume of every device.
    int maxVolume= audioManager.getStreamMaxVolume(audioManager.STREAM_MUSIC);
    //getting the current volume.
    int currentVol = audioManager.getStreamVolume(audioManager.STREAM_MUSIC);
    //setting the audio at the app setup so we wont nned to write this line in every method.
    mediaPlayer = MediaPlayer.create(this,R.raw.allofme);

     SeekBar volumeC = (SeekBar) findViewById(R.id.volSeekBar);
          //setting the limit of the seek bar from its default 100 to the device max.
          volumeC.setMax(maxVolume);
          //setting the current value int to match with the seek bar.
          volumeC.setProgress(currentVol);
         //setting a listener to check the seekbar stats at all changes.
    volumeC.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            Log.i("Seek Bar change:", Integer.toString(progress));
            /*setting the audio manager to stream music with the value of the current integer
            from the seek bar*/
            audioManager.setStreamVolume(audioManager.STREAM_MUSIC ,progress ,0);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });

}

答案 4 :(得分：0)

private AudioManager audioManager;
private SeekBar seekBarSound;
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBarSound = findViewById(R.id.seekbar_sound);
        try {
        setVolumeControlStream(AudioManager.STREAM_MUSIC);
        audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

        seekBarSound.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
        seekBarSound.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
        seekBarSound.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, i, 0);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
 }

与音量键同步： 

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_UP){
        seekBarSound.setProgress((seekBarSound.getProgress()+1>seekBarSound.getMax())?seekBarSound.getMax():seekBarSound.getProgress()+1);
    }else if (keyCode==KeyEvent.KEYCODE_VOLUME_DOWN){
        seekBarSound.setProgress((seekBarSound.getProgress()-1<0)?0:seekBarSound.getProgress()-1);
    }

    return super.onKeyDown(keyCode, event);
}

答案 5 :(得分：0)

我在初始化时遇到卷设置为 0 的问题

我使用以下代码解决了问题

volumeManager.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if(b){
                    mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, i, 0);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

答案 6 :(得分：0)

Volume Seekbar 与改变百分比文本（100 % ）

创建一个java类并粘贴以下所有代码

public class Volume_Dialog extends AppCompatDialogFragment {
private ImageView cross;
private TextView volume_no;
private SeekBar seekBar;
AudioManager audioManager;

@SuppressLint("SetTextI18n")
@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    LayoutInflater inflater = getActivity().getLayoutInflater();
    View view = inflater.inflate(R.layout.volume_popup, null);
    builder.setView(view);
    getActivity().setVolumeControlStream(AudioManager.STREAM_MUSIC);
    cross = view.findViewById(R.id.volume_cross);
    volume_no = view.findViewById(R.id.volume_number);
    seekBar = view.findViewById(R.id.volume_seekbar);
    audioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
    seekBar.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
    seekBar.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
    int mediavolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
    int maxVol = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
    double volPerc = Math.ceil((((double) mediavolume / (double) maxVol) * (double) 100));
    volume_no.setText(volPerc+" %");
    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
            int mediavolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
            int maxVol = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
            double volPerc = Math.ceil((((double) mediavolume / (double) maxVol) * (double) 100));
            volume_no.setText(volPerc+" %");
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });


    cross.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dismiss();
        }
    });
    return builder.create();
}}

现在在任何 onclick 方法中调用 MainActivity 中的这个 java 类。就这样

Volume_Dialog volume_dialog = new Volume_Dialog();
                volume_dialog.show(getSupportFragmentManager(), "popup dialog");
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