1. 我想知道什么是标志(或者可能的值是什么 旗帜)在

   audiomanager.setStreamVolume (int streamType, int index, int flags);

2. 我知道我们可以使用

   audiomanger.getMaxStream(audioManager.getStreamMax(AudioManager.STREAM_MUSIC));

但在某些设备中它给出 13,15，这取决于 Android 版本或设备硬件以及它的范围是多少(最小可能值，最大可能值)

设置特定流的音量索引。

如果设备实现由 isVolumeFixed() 指示的固定音量策略，则此方法无效。//这是什么意思。

参数

streamType  The stream whose volume index should be set.

index   The volume index to set. See getStreamMaxVolume(int) for the largest valid value.

flags   One or more flags. // what are these flags 

最佳答案

关于标志参数: AudioManager.java 中定义了一些标志。 您可以使用其中任何一个来获得所需的效果。 示例:

audioManager.setStreamVolume(audioManager.STREAM_MUSIC,progress,AudioManager.FLAG_SHOW_UI);

或者只是

audioManager.setStreamVolume(audioManager.STREAM_MUSIC,progress,1);

这是来自 AudioManager.java 的代码段，显示了它们是如何定义的。

public static final int FLAG_SHOW_UI = 1 << 0;

/**
 * Whether to include ringer modes as possible options when changing volume.
 * For example, if true and volume level is 0 and the volume is adjusted
 * with {@link #ADJUST_LOWER}, then the ringer mode may switch the silent or
 * vibrate mode.
 * <p>
 * By default this is on for the ring stream. If this flag is included,
 * this behavior will be present regardless of the stream type being
 * affected by the ringer mode.
 *
 * @see #adjustVolume(int, int)
 * @see #adjustStreamVolume(int, int, int)
 */
public static final int FLAG_ALLOW_RINGER_MODES = 1 << 1;

/**
 * Whether to play a sound when changing the volume.
 * <p>
 * If this is given to {@link #adjustVolume(int, int)} or
 * {@link #adjustSuggestedStreamVolume(int, int, int)}, it may be ignored
 * in some cases (for example, the decided stream type is not
 * {@link AudioManager#STREAM_RING}, or the volume is being adjusted
 * downward).
 *
 * @see #adjustStreamVolume(int, int, int)
 * @see #adjustVolume(int, int)
 * @see #setStreamVolume(int, int, int)
 */
public static final int FLAG_PLAY_SOUND = 1 << 2;

/**
 * Removes any sounds/vibrate that may be in the queue, or are playing (related to
 * changing volume).
 */
public static final int FLAG_REMOVE_SOUND_AND_VIBRATE = 1 << 3;

/**
 * Whether to vibrate if going into the vibrate ringer mode.
 */
public static final int FLAG_VIBRATE = 1 << 4;

/**
 * Indicates to VolumePanel that the volume slider should be disabled as user
 * cannot change the stream volume
 * @hide
 */
public static final int FLAG_FIXED_VOLUME = 1 << 5;

/**
 * Indicates the volume set/adjust call is for Bluetooth absolute volume
 * @hide
 */
public static final int FLAG_BLUETOOTH_ABS_VOLUME = 1 << 6;

/**
 * Adjusting the volume was prevented due to silent mode, display a hint in the UI.
 * @hide
 */
public static final int FLAG_SHOW_SILENT_HINT = 1 << 7;

/**
 * Indicates the volume call is for Hdmi Cec system audio volume
 * @hide
 */
public static final int FLAG_HDMI_SYSTEM_AUDIO_VOLUME = 1 << 8;

/**
 * Indicates that this should only be handled if media is actively playing.
 * @hide
 */
public static final int FLAG_ACTIVE_MEDIA_ONLY = 1 << 9;

/**
 * Like FLAG_SHOW_UI, but only dialog warnings and confirmations, no sliders.
 * @hide
 */
public static final int FLAG_SHOW_UI_WARNINGS = 1 << 10;

/**
 * Adjusting the volume down from vibrated was prevented, display a hint in the UI.
 * @hide
 */
public static final int FLAG_SHOW_VIBRATE_HINT = 1 << 11;

/**
 * Adjusting the volume due to a hardware key press.
 * @hide
 */
public static final int FLAG_FROM_KEY = 1 << 12;

关于android - 标志参数是什么意思以及机器人设备可能的最小值和最大值的范围是什么，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27654620/