如何在 Android 中以编程方式增加和减少音量
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【中文标题】如何在 Android 中以编程方式增加和减少音量【英文标题】:How to increase and decrease the volume programmatically in Android 【发布时间】:2017-04-16 23:33:10 【问题描述】:我创建了一个音乐播放器应用,我想以编程方式调高/调低音量。我想实现两个Button
s 来增加/减少音量并设置为媒体播放器。
活动:
control = (ImageView) findViewById(R.id.control);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudiostreamType(AudioManager.STREAM_MUSIC);
control.setOnClickListener(pausePlay);
control.setBackgroundResource(R.drawable.pause);
control id is my play and pause button :
// TODO Auto-generated method stub
// TODO Auto-generated method stub
if (playPause)
control.setBackgroundResource(R.drawable.play);
if (mediaPlayer.isPlaying())
mediaPlayer.pause();
media.stop();
intialStage = false;
playPause = false;
else
control.setBackgroundResource(R.drawable.pause);
if (intialStage)
new Player()
.execute("http://streaming.shoutcast.com/MUKILFMRADIO");
else
if (!mediaPlayer.isPlaying())
mediaPlayer.start();
playPause = true;
布局:
<LinearLayout
android:layout_
android:layout_
android:orientation="horizontal"
android:gravity="center">
<ImageView
android:layout_
android:layout_
android:id="@+id/control1"
android:layout_margin="10dp"
android:layout_gravity="center"
android:background="@drawable/decrement"
android:layout_above="@+id/latestAddedSongs"
android:layout_alignEnd="@+id/musicArtistName" />
<ImageView
android:layout_
android:layout_
android:id="@+id/control"
android:layout_margin="10dp"
android:layout_gravity="center"
android:background="@drawable/play"
android:layout_above="@+id/latestAddedSongs"
android:layout_alignEnd="@+id/musicArtistName" />
<ImageView
android:layout_
android:layout_
android:id="@+id/control2"
android:layout_margin="10dp"
android:layout_gravity="center"
android:background="@drawable/increment"
android:layout_above="@+id/latestAddedSongs"
android:layout_alignEnd="@+id/musicArtistName" />
</LinearLayout>
【问题讨论】:
您想管理媒体播放器的音量吗?使用mAudioManager.setStreamVolume(3, paramAnonymousInt, 0)
但是如何将功能设置为我的上下按钮
向我展示完整的 xml 和完整的 java .. 即编辑您的问题
【参考方案1】:
为音频管理器创建一个对象
AudioManager audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
Button upButton = (Button) findViewById(R.id.upButton);
upButton.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
//To increase media player volume
audioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND);
);
Button downButton = (Button) findViewById(R.id.downButton);
downButton.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
//To decrease media player volume
audioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
);
上面的例子使用了Button标签
音量上下 代码
@Override
public boolean dispatchKeyEvent(KeyEvent event)
int action = event.getAction();
int keyCode = event.getKeyCode();
switch (keyCode)
case KeyEvent.KEYCODE_VOLUME_UP:
if (action == KeyEvent.ACTION_DOWN)
audioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND);
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
if (action == KeyEvent.ACTION_DOWN)
audioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
return true;
default:
return super.dispatchKeyEvent(event);
【讨论】:
【参考方案2】:试试下面的代码
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
seekbar.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener()
@Override
public void onProgressChanged(SeekBar seekBar, int newVolume, boolean b)
textview.setText("Media Volume : " + newVolume);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, newVolume, 0);
@Override
public void onStartTrackingTouch(SeekBar seekBar)
@Override
public void onStopTrackingTouch(SeekBar seekBar)
);
【讨论】:
感谢您的回答!。它工作完美。简单易行的答案。【参考方案3】:下面的代码效果很好
Android 中有几个可用的流可以用来管理音频
/** The audio stream for phone calls */
public static final int STREAM_VOICE_CALL = AudioSystem.STREAM_VOICE_CALL;
/** The audio stream for system sounds */
public static final int STREAM_SYSTEM = AudioSystem.STREAM_SYSTEM;
/** The audio stream for the phone ring */
public static final int STREAM_RING = AudioSystem.STREAM_RING;
/** The audio stream for music playback */
public static final int STREAM_MUSIC = AudioSystem.STREAM_MUSIC;
/** The audio stream for alarms */
public static final int STREAM_ALARM = AudioSystem.STREAM_ALARM;
/** The audio stream for notifications */
public static final int STREAM_NOTIFICATION = AudioSystem.STREAM_NOTIFICATION;
/** @hide The audio stream for phone calls when connected to bluetooth */
public static final int STREAM_BLUETOOTH_SCO = AudioSystem.STREAM_BLUETOOTH_SCO;
/** @hide The audio stream for enforced system sounds in certain countries (e.g camera in Japan) */
public static final int STREAM_SYSTEM_ENFORCED = AudioSystem.STREAM_SYSTEM_ENFORCED;
/** The audio stream for DTMF Tones */
public static final int STREAM_DTMF = AudioSystem.STREAM_DTMF;
/** @hide The audio stream for text to speech (TTS) */
public static final int STREAM_TTS = AudioSystem.STREAM_TTS;
根据您的需要,您可以在此处更改流,例如 STREAM_MUSIC:
您可以使用 AudioSytem 类中的 refelction 获得常量值:
private int getStreamType(String streamName)
final String streamSourceClassName = "android.media.AudioSystem";
int streamType = 0;
try
streamType = (int) Class.forName(streamSourceClassName).getDeclaredField(streamName).get(null);
catch (ClassNotFoundException | IllegalAccessException | NoSuchFieldException e)
e.printStackTrace();
return streamType;
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
seekbar.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener()
@Override
public void onProgressChanged(SeekBar seekBar, int newVolume, boolean b)
textview.setText("Media Volume : " + newVolume);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, newVolume, 0);
@Override
public void onStartTrackingTouch(SeekBar seekBar)
@Override
public void onStopTrackingTouch(SeekBar seekBar)
);
【讨论】:
【参考方案4】:跟进jesu的解决方案,如果您想在Service而不是Activity中更改音量,请替换:
AudioManager audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
与:
AudioManager audioManager;
audioManager = (AudioManager) YourServiceName.this.getSystemService(Context.AUDIO_SERVICE);
【讨论】:
【参考方案5】:如果你的类型是AudioManager.STREAM_MUSIC:使用这个代码,按手机音量键
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
switch (keyCode)
case KeyEvent.KEYCODE_VOLUME_UP:
audio.adjustStreamVolume(
AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE,
AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
audio.adjustStreamVolume(
AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER,
AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
return true;
default:
break;
return super.onKeyDown(keyCode, event);
【讨论】:
【参考方案6】:此代码将在按下 buttonSES 时立即将音量设置为 100,而不会向用户反馈。
public void perform_actionSES(View v)
Button buttonSES = (Button) findViewById(R.id.buttonSES);
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 100, 0);
【讨论】:
【参考方案7】:各位程序员。我试图使代码尽可能简单。我希望这对某人有帮助。祝你有美好的一天!
我正在使用: 安卓工作室 4.2.2 构建 #AI-202.7660.26.42.7486908,构建于 2021 年 6 月 24 日 运行时版本:11.0.8+10-b944.6842174 amd64 虚拟机:OpenJDK 64 位服务器虚拟机(不适用) 视窗 10 10.0
对于 MainActivity.java,这里是代码。
package com.tutorial.android.mediaplayertest;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
private MediaPlayer mediaPlayer;
private AudioManager audioManager;
private Button play, pause, decVolume, incVolume;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// I want my media player instantiated as soon as the app starts
mediaPlayer = MediaPlayer.create(this, R.raw.test);
// play button
play = findViewById(R.id.play_button);
play.setOnClickListener(view ->
Toast.makeText(this, "Music Start", Toast.LENGTH_SHORT).show();
mediaPlayer.start();
);
// pause button
pause = findViewById(R.id.pause_button);
pause.setOnClickListener(view ->
Toast.makeText(this, "Pause", Toast.LENGTH_SHORT).show();
mediaPlayer.pause();
);
audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
// volume down button
decVolume = findViewById(R.id.volume_down);
decVolume.setOnClickListener(view ->
Toast.makeText(this, "Volume down", Toast.LENGTH_SHORT).show();
audioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
);
// volume up button
incVolume = findViewById(R.id.volume_up);
incVolume.setOnClickListener(view ->
Toast.makeText(this, "Volume up", Toast.LENGTH_SHORT).show();
audioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND);
);
如果是activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/play_button"
android:layout_
android:layout_
android:text="Play" />
<Button
android:id="@+id/pause_button"
android:layout_
android:layout_
android:text="Pause" />
<LinearLayout
android:layout_
android:layout_>
<Button
android:id="@+id/volume_down"
android:layout_
android:layout_
android:text="-" />
<Button
android:layout_marginLeft="16dp"
android:id="@+id/volume_up"
android:layout_
android:layout_
android:text="+" />
</LinearLayout>
</LinearLayout>
【讨论】:
【参考方案8】:AudioManager aManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
Button buttonUp= (Button) findViewById(R.id.upButton);
buttonUp.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
enter code here
//To increase media player volume
`enter code here`aManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND);
);
Button downButton = (Button) findViewById(R.id.downButton);
buttondown.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
aManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
);
【讨论】:
仅仅发布源代码可能还不够(尽管它可能会解决问题)。请考虑添加一些解释,说明您发布的代码应该解决问题的原因。以上是关于如何在 Android 中以编程方式增加和减少音量的主要内容,如果未能解决你的问题,请参考以下文章
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