Android拨打接听电话自动免提

权限：

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

public class MainActivity extends AppCompatActivity {AudioManager audioManager;int currVolume;//当前音量
@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);TelListner listener = new TelListner();telManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);}public void click(View v) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {if (MainActivity.this.checkSelfPermission(Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED) {callPhone();} else {//
                Toast.makeText(this, "没有权限", Toast.LENGTH_LONG).show();}} else {callPhone();}}void callPhone() {Intent callIntent = new Intent(Intent.ACTION_CALL);callIntent.setData(Uri.parse("tel:10086"));callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(callIntent);}private class TelListner extends PhoneStateListener {boolean comingPhone = false;//标识
@Overridepublic void onCallStateChanged(int state, String incomingNumber) {switch (state) {case TelephonyManager.CALL_STATE_IDLE:/* 无任何状态 */if (this.comingPhone) {this.comingPhone = false;setSpeekModle(false);}break;case TelephonyManager.CALL_STATE_OFFHOOK:/* 接起电话 */this.comingPhone = true;setSpeekModle(true);break;case TelephonyManager.CALL_STATE_RINGING:/* 电话进来 */this.comingPhone = true;setSpeekModle(true);break;}}}void setSpeekModle(boolean open) {audioManager.setMode(AudioManager.ROUTE_SPEAKER);currVolume = audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL);//5.0以上if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);} else {audioManager.setMode(AudioManager.MODE_IN_CALL);}if (!audioManager.isSpeakerphoneOn() && open) {Toast.makeText(MainActivity.this, "免提模式", Toast.LENGTH_LONG).show();audioManager.setSpeakerphoneOn(true);//开启免提
            audioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL,audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL),AudioManager.STREAM_VOICE_CALL);} else if (audioManager.isSpeakerphoneOn() && open) {audioManager.setSpeakerphoneOn(false);audioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL, currVolume,AudioManager.STREAM_VOICE_CALL);}}
}

ps：此方式在华为手机上不兼容