如何在 Android 中以编程方式打开内置均衡器？

Question

我看到很多应用程序在内置均衡器中打开系统（google 播放音乐、Spotify、三星音乐播放器）。直接使用，无需自己从头编写。这些应用程序如何做到这一点？我找不到解决方案。

} else if (id == R.id.action_fx) {
        Intent intent = new Intent();
        intent.setAction("android.media.action.DISPLAY_AUDIO_EFFECT_CONTROL_PANEL");
        if ((intent.resolveActivity(getPackageManager()) != null)) {
            startActivity(intent);
        } else {
            Intent intent11 = new Intent(MainActivity.this, Help.class);
            intent11.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            startActivity(intent11);
            // No equalizer found :(
        }
        return true;

Answer 1

以下应该可以启动默认均衡器 Activity：

Intent intent = new Intent(AudioEffect
    .ACTION_DISPLAY_AUDIO_EFFECT_CONTROL_PANEL);

if ((intent.resolveActivity(getPackageManager()) != null)) {
    startActivityForResult(intent, REQUEST_EQ);
} else {
    // No equalizer found :(
}

Spotify 基本一样，其他的没查过

startActivityForResult() 的必要性在 docs 中有解释：

The intent carries a number of extras used by the player application to communicate necessary pieces of information to the control panel application.

The calling application must use the android.app.Activity#startActivityForResult(Intent, int) method to launch the control panel so that its package name is indicated and used by the control panel application to keep track of changes for this particular application.

Answer 2

你需要，intent.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, mp.getAudioSessionId();) 那么你需要，但你需要一个 MediaPlayer，变量，你需要显示均衡器意图以及同一意图中的 audioSession 和 getPackageName effects.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, this.getPackageName()); 此外，Intent intent = new Intent(AudioEffect.ACTION_DISPLAY_AUDIO_EFFECT_CONTROL_PANEL); 带有音频会话和包名称。首先显示意图，然后是音频会话和 getpackagename，

然后在你需要的服务中。仅当播放不止一首歌曲时。您需要在服务中添加以下代码，否则均衡器将无法始终正常工作。

public void openAudioFx() {
    Intent i = new Intent(AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION);
    i.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, getPackageName);
    i.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, audioSession);
    this.sendBroadcast(i);
}

public void closeAudioFx() {
    Intent k = new Intent(AudioEffect.ACTION_CLOSE_AUDIO_EFFECT_CONTROL_SESSION);
    k.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, getPackageName);
    k.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, audioSession);
    this.sendBroadcast(k);
    }

然后你必须接收广播，让它一直工作你需要做一个 int audioSession = 0;

和 String getPackageName = getPackageName();

那么你需要广播包名和音频会话，然后使用变量，而不是代码。均衡器显示意图，以及包名和音频效果，是意图显示均衡器工作所必需的，仅在Activity.

下有效

我想尝试使用的广播接收器。 class,

public final BroadcastReceiver hello;
{
    hello = new BroadcastReceiver() {


        private static final String TAG = "mMessageReceiver";

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent != null) {
                String action = intent.getAction();


                switch (action) {
                    case AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION:
                        // Log.d(TAG_MAIN_ACTIVITY, action);


                        break;
                    case AudioEffect.ACTION_CLOSE_AUDIO_EFFECT_CONTROL_SESSION:
                        break;
                    case AudioEffect.EXTRA_AUDIO_SESSION:
                        audioSession = intent.getIntExtra(AudioEffect.EXTRA_AUDIO_SESSION, 0);


                        break;
                    case AudioEffect.EXTRA_PACKAGE_NAME:
                        // Log.d(TAG_MAIN_ACTIVITY, action);


                        break;

然后您需要从服务广播包名，activity 弄清楚。需要更高的变量然后以某种方式使用字符串，对 pacakename 广播，然后使用更高的变量并在广播中。然后把这个放进去，onCreate public final BroadcastReceiver hello;

{
    hello = new BroadcastReceiver() {


        private static final String TAG = "mMessageReceiver";

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent != null) {
                String action = intent.getAction();


                switch (action) {
                    case AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION:
                        // Log.d(TAG_MAIN_ACTIVITY, action);
                        break;
                    case AudioEffect.ACTION_CLOSE_AUDIO_EFFECT_CONTROL_SESSION:
                        break;
                    case AudioEffect.EXTRA_AUDIO_SESSION:
                        audioSession = intent.getIntExtra(AudioEffect.EXTRA_AUDIO_SESSION, 0);
                        break;
                    case AudioEffect.EXTRA_PACKAGE_NAME:
                        // Log.d(TAG_MAIN_ACTIVITY, action);
                        break;
                    }

    LocalBroadcastManager.getInstance(this).registerReceiver(hello, new IntentFilter("ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION"));
    LocalBroadcastManager.getInstance(this).registerReceiver(hello, new IntentFilter("ACTION_CLOSE_AUDIO_EFFECT_CONTROL_SESSION"));
    LocalBroadcastManager.getInstance(this).registerReceiver(hello, new IntentFilter("EXTRA_PACKAGE_NAME"));
    LocalBroadcastManager.getInstance(this).registerReceiver(hello, new IntentFilter("EXTRA_AUDIO_SESSION"));

完成。希望它有效，让我知道如果有任何遗漏，我可能会回复。抱歉，部分代码格式不正确，请阅读并将所有代码放在一起，然后如果您能看到写的代码，请在代码之后分开。

Answer 3

这是我在Android中打开内置均衡器的函数，你只需要在下面的函数中传递Activity上下文并给出会话ID。

    public static void openEqualizer(@NonNull final Activity activity) throws RemoteException {
    final int sessionId = MediaPlaybackServiceManager.sService.getAudioSessionId();
    if (sessionId == AudioEffect.ERROR_BAD_VALUE) {
        Toast.makeText(activity, "No Session Id", Toast.LENGTH_LONG).show();
    } else {
        try {
            final Intent effects = new Intent(AudioEffect.ACTION_DISPLAY_AUDIO_EFFECT_CONTROL_PANEL);
            effects.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, "your app package name");
            effects.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, sessionId);
            effects.putExtra(AudioEffect.EXTRA_CONTENT_TYPE, AudioEffect.CONTENT_TYPE_MUSIC);
            activity.startActivityForResult(effects, 0);
        } catch (@NonNull final ActivityNotFoundException notFound) {
            Toast.makeText(activity, "There is no equalizer", Toast.LENGTH_SHORT).show();
        }
    }
}

上面的代码对我有用，我希望它对你也有用...

如何在 Android 中以编程方式打开内置均衡器？

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