如何在通话期间打开扬声器

Question

我打电话时试着打开扬声器.我试过这段代码.注册新的电话听众.但这不起作用.它显示吐司信息,但扬声器仍然是静音(默认只有听筒).

@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permisions.

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

编辑

这也不起作用.它返回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

由于自定义ROM,我遇到了同样的问题.我已经安装了库存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);