1

我正在尝试stream volume使用SeekBar（audioMan IS 已初始化）调整 a：

        sbTest = (SeekBar)findViewById(R.id.seekBar1);
    sbTest.setMax(audioMan.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
    sbTest.setProgress(audioMan.getStreamVolume(AudioManager.STREAM_MUSIC));
    sbTest.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            audioMan.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    progress, AudioManager.FLAG_SHOW_UI);

        }
    });

IllegalArgumentException我一触碰应用程序就会崩溃SeekBar。LogCat 的第一行（后面是大量系统类的行号）：

      04-22 22:58:28.400: E/AndroidRuntime(28881): FATAL EXCEPTION: main
      04-22 22:58:28.400: E/AndroidRuntime(28881): java.lang.IllegalArgumentException: Bad direction 8

我想我传递给该方法的整数参数是无效的。那么如何使用 SeekBar 调整流音量？

4

1 回答 1

5

我在我的 Volumizer 示例项目中使用setStreamVolume()而不是：adjustStreamVolume()

/***
  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);
    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
      }
    });
  }
}
于 2013-04-22T21:19:53.587 回答