在 android 中使用 SeekBar 控制音量？答案

【问题标题】：Using SeekBar to Control Volume in android?在 android 中使用 SeekBar 控制音量？
【发布时间】：2012-04-25 10:25:32
【问题描述】：

如何在不通过 Android 设备上的音量按钮控制音量的情况下使用搜索栏准确更改应用的音量？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。谁能帮帮我？

【问题讨论】：

stackoverflow.com/questions/11095576/…

标签： android volume seekbar android-audiomanager

【解决方案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();
        }
    }

【讨论】：

Eclipse 告诉我删除 @Override 注释。我这样做后它不起作用。请帮忙
这很可能是因为您在 Java 1.5 和 Java 1.6 之间切换。在 1.5 中，您无法使用 @Override 标记接口实现，但在 1.6 中可以。
我试图让我的活动实现 OnSeekBarChangeListener 并重新实现这些方法，但应用程序在以下几行崩溃：volumeSeekbar.setMax(audioManager .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); volumeSeekbar.setProgress(audioManager .getStreamVolume(AudioManager.STREAM_MUSIC));
当用户使用设备音量控制修改音量时，是否有监听器将SeekBar重置为新值？
我听不到android中音量变化的声音

【解决方案2】：

这是我用来调节音量的自定义View。它通过向上滑动手指来工作，但您可以轻松更改它。

滑块视图

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 - 确保实现OnValueChangeListener。

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

这并不完全符合您的要求，但我认为它肯定会帮助您。

【讨论】：

【解决方案3】：

@CommonsWare 在https://github.com/commonsguy/cw-omnibus/tree/master/SystemServices/Volume 中这样做，并使用 SeekBar 设置五种类型的音量

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
      }
    });
  }
}

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

【讨论】：

【解决方案4】：

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);
}

【讨论】：

【解决方案5】：

我为你添加了一些清晰的注释，这样你就会明白每一行的逻辑祝你好运！

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) {

        }
    });

}

【讨论】：

【解决方案6】：

我在初始化时遇到音量设置为 0 的问题

我已经使用下面的代码解决了问题

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) {

            }
        });

【讨论】：

【解决方案7】：

带有更改百分比文本的音量搜索栏（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。就是这样

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

【讨论】：