android手电筒（摇一摇也可开启手电筒）

 package com.firefly.myflashlight;

 import android.app.Activity;
 import android.hardware.Camera;
 import android.hardware.Camera.Parameters;
 import android.hardware.Sensor;
 import android.hardware.SensorEvent;
 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
 import android.os.Bundle;
 import android.os.Vibrator;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.Toast;

 public class MainActivity extends Activity {
     ImageView image;
     Boolean flag = false;
     Camera camera;
     Parameters params;
     // 传感器管理
     SensorManager sm;
     Vibrator v ;//震动
     sensorListener s;//传感器监听

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         requestWindowFeature(1);
         setContentView(R.layout.activity_main);
         image = (ImageView) findViewById(R.id.image);
         Shake();
     }

     private void Shake() {
         // 初始化数据
         sm = (SensorManager) getSystemService(SENSOR_SERVICE);
         v = (Vibrator) getSystemService(VIBRATOR_SERVICE);
         s = new sensorListener();
         sm.registerListener(s, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                 SensorManager.SENSOR_DELAY_NORMAL);
     }

     //开/关按钮的点击事件
     public void init(View view) {
         Replese();
     }
     public void Replese(){
         if (flag == false) {
             camera = Camera.open();//打开相机
             params = camera.getParameters();////获取预览的各种分辨率
             params.setFlashMode(Parameters.FLASH_MODE_TORCH);
             camera.setParameters(params);
             camera.startPreview();
             Toast.makeText(getApplicationContext(), "别摇了，我又不是微信，摇不出妹子的！！", 0).show();
             Toast.makeText(getApplicationContext(), "电筒已开启", 0).show();
             image.setImageResource(R.drawable.off);//当相机打开之后按钮要变成关闭的颜色
             flag = true;
         } else {
             Toast.makeText(getApplicationContext(), "您还可以直接摇一摇打开手电筒哦！", 0).show();
             image.setImageResource(R.drawable.on);
             camera.stopPreview();
             camera.release();
             flag = false;
         }
     }

     @Override
     protected void onPause() {
         // TODO Auto-generated method stub
         sm.unregisterListener(s);
         super.onPause();
     }

     @Override
     protected void onStop() {
         // TODO Auto-generated method stub
         sm.unregisterListener(s);
         super.onStop();
     }

     //震动（传感器）监听事件
     private class sensorListener implements SensorEventListener {

         @Override
         public void onSensorChanged(SensorEvent event) {
             int sensorType = event.sensor.getType();
             float[] values = event.values;
             if (sensorType == Sensor.TYPE_ACCELEROMETER) {
                 //如果摇晃的力度在15
                 if (Math.abs(values[0]) > 15 || Math.abs(values[1]) > 15
                         || Math.abs(values[2]) > 15) {
                     Replese();//就把电筒打开
                     v.vibrate(200);
                 }
             }
         }

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

         }

     }
 }