[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程序的音量？我的Android上的音量键上具有单独的功能，这就是为什么我想使用搜寻栏来控制音量的原因。有人可以帮我吗？
请看下面的代码。它解决了您的问题。
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();
}
}
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工作，但是您可以轻松地更改它。
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-确保实现了OnValueChangeListener。
SliderView mSlider;
mSlider= (SliderView) findViewById(id);
mSlider.setOnValueChangeListener(this);
mSlider.setMax(mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
这并不是您所要的，但我认为它绝对可以帮助您。
@@ CommonsWare在https://github.com/commonsguy/cw-omnibus/tree/master/SystemServices/Volume中这样做，并使用SeekBar设置五种音量类型
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
}
});
}
}
并且仅用于控制音量music=(SeekBar)findViewById(R.id.music);和initBar(music, AudioManager.STREAM_MUSIC);
我为您添加了一些清晰的注释，以便您了解每一行的逻辑，祝您好运！
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) {
}
});
}
}