如何将音量滑块添加到android操作栏？

Question

我想将音量添加到操作栏.当用户点击该操作时,它应该将滑块放在操作栏中以选择正确的音量我该怎么做

Answer 1

处理此问题的最简单方法是使用ActionBar.setCustomView.

这是一个控制媒体音量的示例:

首先,您需要创建包含您的自定义布局SeekBar.

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <SeekBar
        android:id="@android:id/progress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical" />

</FrameLayout>

现在SeekBar.OnSeekBarChangeListener在你的Activityor中实现Fragment并声明一些变量:

/** Used to actually adjust the volume */
private AudioManager mAudioManager;
/** Used to control the volume for a given stream type */
private SeekBar mVolumeControls;
/** True is the volume controls are showing, false otherwise */
private boolean mShowingControls;

onCreate无论您选择在何处,都可以自定义并将自定义View应用于ActionBar.

    // Control the media volume
    setVolumeControlStream(AudioManager.STREAM_MUSIC);
    // Initialize the AudioManager
    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

    // Inflate the custom ActionBar View
    final View view = getLayoutInflater().inflate(R.layout.view_action_bar_slider, null);
    mVolumeControls = (SeekBar) view.findViewById(android.R.id.progress);
    // Set the max range of the SeekBar to the max volume stream type
    mVolumeControls.setMax(mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
    // Bind the OnSeekBarChangeListener
    mVolumeControls.setOnSeekBarChangeListener(this);

    // Apply the custom View to the ActionBar
    getActionBar().setCustomView(view, new ActionBar.LayoutParams(MATCH_PARENT, MATCH_PARENT));

要在MenuItem按下时切换控件,请调用ActionBar.setDisplayShowCustomEnabled并不要忘记将SeekBar进度更新为您正在控制的当前音量级别.

        // Toggle the custom View's visibility
        mShowingControls = !mShowingControls;
        getActionBar().setDisplayShowCustomEnabled(mShowingControls);
        // Set the progress to the current volume level of the stream
        mVolumeControls.setProgress(mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC));

在OnSeekBarChangeListener.onProgressChanged通话中控制音量流AudioManager.setStreamVolume

@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    // Adjust the volume for the given stream type
    mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
}

最后OnSeekBarChangeListener.onStopTrackingTouch,删除自定义控件以ActionBar再次正常显示.

    // Remove the SeekBar from the ActionBar
    mShowingControls = false;
    getActionBar().setDisplayShowCustomEnabled(false);

这是你按下之前和之后的图片MenuItem.