Android平台摇摇切歌功能

     前些天印尼客户要求在高通平台7251上加一个摇摇切歌功能。查了些资料，基本实现了此功能。

直接上源码，用svn查看修改点。

前面两个ic_mp_shake_off_btn是两张图片，资源随便让UI做两张即可。

接下来就是audio_player.xml文件的修改：（这个就是你要将你的图标按钮放在哪个地方）

对应的修改其他分辨率的布局文件audio_player.xml

接下来添加对应的字串：String.xml

<span style="font-size:24px;">    <string name="shake_on_notif">摇一摇换歌功能已开启.</string>
    <string name="shake_off_notif">摇一摇换歌功能已关闭.</string></span>

接下来修改音乐播放的主类：MediaPlaybackActivity.java

首先要添加变量：private ImageButton mShakeButton;

接下来再通过findViewById来实例化摇摇按钮并添加监听；

<pre name="code" class="java"><span style="font-size:24px;">    mShakeButton = ((ImageButton) findViewById(R.id.shake));
    mShakeButton.setOnClickListener(mShakeListener); </span>

在函数onConfigurationChanged也做同样的操作；

<span style="font-size:24px;">    mShakeButton = ((ImageButton) findViewById(R.id.shake));
    mShakeButton.setOnClickListener(mShakeListener); </span>

<span style="font-size:24px;">    <span style="font-size:18px;">private View.OnClickListener mShakeListener = new View.OnClickListener() {
        public void onClick(View v) {
            shakeEnable();
        }
    };</span></span>

<span style="font-size:24px;">    <span style="font-size:18px;">private void shakeEnable(){
	if (mService == null) {
		return;
	}
	try {
	if (mService.getShakeFlag()== false){
		mService.setShakeFlag(true);
		showToast(R.string.shake_on_notif);
	}
	else{
		mService.setShakeFlag(false);
		showToast(R.string.shake_off_notif);
	}
	setShakeButtonImage();
	}catch (RemoteException ex) {
        }
	
    }</span></span>

在ServiceConnection里修改按钮的可操作和设置图片；

写setShakeButtonImage 函数：

<span style="font-size:24px;">   <span style="font-size:18px;">private void setShakeButtonImage() {
        if (mService == null) return;
          try {
		if  (mService.getShakeFlag() == false) {
			mShakeButton.setImageResource(R.drawable.ic_mp_shake_off_btn);
		}else{
			mShakeButton.setImageResource(R.drawable.ic_mp_shake_on_btn);
		}
	   }catch (RemoteException ex) {
        }
    }</span></span>

接下来看看MediaPlaybackService.java

先import  onShakeListener

<span style="font-size:24px;">import com.android.music.ShakeDetector.onShakeListener;</span>

申明变量：

private boolean mShakeFlag = false;

ShakeDetector mShakeDetector = null;

在onCreate()中从sharedpreference中读取值，来设置是否打开摇摇功能；

<span style="font-size:24px;">  <span style="font-size:18px;">mShakeFlag = mPreferences.getBoolean("shakeflag", false);
  setShakeOnorOff();</span></span>

<span style="font-size:24px;">   <span style="font-size:18px;">if (mShakeDetector != null) {
	mShakeDetector.unRegisterListener();
   }</span></span>

<span style="font-size:24px;">   <span style="font-size:18px;"> private void setShakeOnorOff(){
 		if (mShakeFlag == true){
 		        mShakeDetector= new ShakeDetector(this);
 			mShakeDetector.registerListener();
 			mShakeDetector.setOnShakeListener(new onShakeListener() {
 				@Override
 				public void onShake() {
 					// TODO Auto-generated method stub
 					if (isPlaying()){
 					     gotoNext(true);
 					}
 				}
 			});
 		}else{
			if (mShakeDetector != null) {
				mShakeDetector.unRegisterListener();
			}
 		}
		Editor ed = mPreferences.edit();
		ed.putBoolean("shakeflag", mShakeFlag);
		SharedPreferencesCompat.apply(ed);
 	}

    public void setShakeFlag(boolean shakeflag) {
        synchronized (this) {
            mShakeFlag = shakeflag;
            setShakeOnorOff();
        }
    }

    public boolean getShakeFlag() {
        return mShakeFlag;
    }</span></span>

<span style="font-size:24px;">      <span style="font-size:18px;">public void setShakeFlag(boolean shakeflag) {
	    mService.get().setShakeFlag(shakeflag);  
        }

        public boolean getShakeFlag() {
            return mService.get().getShakeFlag();
        }</span></span>

<span style="font-size:24px;">   <span style="font-size:18px;">void setShakeFlag(boolean shakeflag);
    boolean getShakeFlag();</span></span>

<span style="font-size:18px;">package com.android.music;
 
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;

public class ShakeDetector implements SensorEventListener {
	private static final String TAG = "ShakeDetector";
	private Context mContext;
	private long lastTime;
        private float last_x;
	private float last_y;
	private float last_z;
	private static final double SHAKE_SHRESHOLD = 3000d;//这个值可根据sensor的灵敏度来调整
        private Sensor sensor;
	private SensorManager sensorManager;
	public onShakeListener shakeListener;

	public ShakeDetector(Context context) {
		mContext = context;
		sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
	}
 
      

	public boolean registerListener() {

		if (sensorManager != null) {
			sensor = sensorManager
					.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
			if (sensor != null) {
				this.sensorManager.registerListener(this, sensor,
						SensorManager.SENSOR_DELAY_GAME);
				return true;
			}
		}
		return false;
	}


	public void unRegisterListener() {
	System.out.println("ShakeDetector:unRegisterListener");
		if (sensorManager != null  && sensor != null)
			sensorManager.unregisterListener(this , sensor);
	}

	public void setOnShakeListener(onShakeListener listener) {
		shakeListener = listener;
	}

	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// TODO Auto-generated method stub

	}


	@Override
	public void onSensorChanged(SensorEvent event) {
		// TODO Auto-generated method stub
		
			long curTime = java.lang.System.currentTimeMillis();
			if ((curTime - lastTime) > 50) {
				long diffTime = (curTime - lastTime);
				lastTime = curTime;
				float x = event.values[0];
				float y = event.values[1];
				float z = event.values[2];
                                float speed = Math.abs(x + y + z - last_x - last_y - last_z)
						/ diffTime * 10000;
				System.out.println("ShakeDetector:onSensorChanged speed ="+speed);
				if (speed > SHAKE_SHRESHOLD) {
					shakeListener.onShake();
				}
				last_x = x;
				last_y = y;
				last_z = z;
			}

	}

       public interface onShakeListener {
		public void onShake();
	}
}</span>