Question

我在编码方面是全新的，事实上我不是编码器，而是试图解决连接耳机时仍然想要使用耳机的问题。

经过几天的搜索，我从这里看到了一个样本（http://oneyoung.im/2014/12/26/force-route-audio-stream-to-headphone/）。

我下载并安装了Android Studio并尝试了上面的课程。但是我收到了一个错误。

12-02 13:28:48.652 6475-6475/com.free.alahdal.stopheadset E/AudioTest: setDeviceConnectionState failed: java.lang.NoSuchMethodException: setDeviceConnectionState [int, int, class java.lang.String]

以下是MyActivity.java＆amp; AudioTest.java

MyActivity：

package com.free.alahdal.stopheadset;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;


public class MyActivity extends AppCompatActivity {
    AudioTest at = new AudioTest();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
    }


    public void offHeadset(View view) {
      at.forceRouteHeadset(false);
    }

    public void onHeadset(View view) {
      at.forceRouteHeadset(true);
    }

}

以下是AudioTest

import android.util.Log;
import java.lang.reflect.Method;

public class AudioTest {
    private final String TAG = "AudioTest";
     // Constants copied from AudioSystem
    private static final int DEVICE_IN_WIRED_HEADSET    = 0x400000;
    private static final int DEVICE_OUT_EARPIECE        = 0x1;
    private static final int DEVICE_OUT_WIRED_HEADSET   = 0x4;
    private static final int DEVICE_STATE_UNAVAILABLE   = 0;
    private static final int DEVICE_STATE_AVAILABLE     = 1;

    /* force route function through AudioSystem */
    private void setDeviceConnectionState(final int device, final int state, final String address) {
        try {
            Class<?> audioSystem = Class.forName("android.media.AudioSystem");
            Method setDeviceConnectionState = audioSystem.getMethod(
                    "setDeviceConnectionState", int.class, int.class, String.class);

            setDeviceConnectionState.invoke(audioSystem, device, state, address);
        } catch (Exception e) {
            Log.e(TAG, "setDeviceConnectionState failed: " + e);
        }
    }

    public void forceRouteHeadset(boolean enable) {
        if (enable) {
            Log.i(TAG, "force route to Headset");
            setDeviceConnectionState(DEVICE_IN_WIRED_HEADSET, DEVICE_STATE_AVAILABLE, "");
            setDeviceConnectionState(DEVICE_OUT_WIRED_HEADSET, DEVICE_STATE_AVAILABLE, "");
        } else {
            Log.i(TAG, "force route to Earpirce");
            setDeviceConnectionState(DEVICE_IN_WIRED_HEADSET, DEVICE_STATE_UNAVAILABLE, "");
            setDeviceConnectionState(DEVICE_OUT_WIRED_HEADSET, DEVICE_STATE_UNAVAILABLE, "");
            setDeviceConnectionState(DEVICE_OUT_EARPIECE, DEVICE_STATE_AVAILABLE, "");
        }
    }
}

Answer 1

以下是您要用于反射的方法。

/**
 * Indicate wired accessory connection state change.
 * @param device type of device connected/disconnected (AudioManager.DEVICE_OUT_xxx)
 * @param state  new connection state: 1 connected, 0 disconnected
 * @param name   device name
 * {@hide}
 */
public void setWiredDeviceConnectionState(int type, int state, String address, String name) {
    IAudioService service = getService();
    try {
        service.setWiredDeviceConnectionState(type, state, address, name,
                mApplicationContext.getOpPackageName());
    } catch (RemoteException e) {
        Log.e(TAG, "Dead object in setWiredDeviceConnectionState "+e);
    }
}

此方法使用四个参数（以上kitkat版本）和三个参数直到kitkat。您正在使用的方法不在api中，这就是为什么它会抛出这样的异常。如果它有帮助，别忘了接受。

Android：强制音频到听筒＆gt;＆gt; setDeviceConnectionState失败：java.lang.NoSuchMethodException：

1 个答案: