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

        }

    }
}