java - 如何在通话期间打开扬声器

Question

我正在打电话时试着打开扬声器。我试过这个密码。注册新的电话侦听器。但这不管用。它显示吐司信息，但扬声器仍然是无声的（默认情况下只有听筒）。

@Override
    public void onCallStateChanged(int state, String incomingNumber) {
        super.onCallStateChanged(state, incomingNumber);
        switch (state) {
            case TelephonyManager.CALL_STATE_OFFHOOK:
                Log.i(LOG_TAG, "onCallStateChanged: CALL_STATE_OFFHOOK");
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                Toast.makeText(mContext,"Call, time to turn speaker on",Toast.LENGTH_SHORT).show();
                AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
                audioManager.setSpeakerphoneOn(true);
                break;
        }
    }

当然，我在androidmanifest.xml中添加了权限。

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

编辑
这个aslo不起作用。
返回false（toast消息为false）；

case TelephonyManager.CALL_STATE_OFFHOOK:
                Log.i(LOG_TAG, "onCallStateChanged: CALL_STATE_OFFHOOK");
                try {

                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                     Toast.makeText(mContext,"Call, time to turn speaker on",Toast.LENGTH_SHORT).show();
                audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
                ((Activity)mContext).setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
                audioManager.setMode(AudioManager.MODE_IN_CALL);
                audioManager.setSpeakerphoneOn(true);
                boolean check = audioManager.isSpeakerphoneOn();
                Toast.makeText(mContext, "Speaker is on :" +String.valueOf(check),Toast.LENGTH_SHORT).show();
                break;

Answer 1

我有同样的问题，因为自定义rom。我已经安装了stock rom，一切都很好，这是我的代码

audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
                audioManager.setMode(AudioManager.MODE_IN_CALL);
                if (!audioManager.isSpeakerphoneOn())
                    audioManager.setSpeakerphoneOn(true);
                audioManager.setMode(AudioManager.MODE_NORMAL);