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

         }

     }

 }