android手电筒（摇一摇也可开启手电筒）

  1 package com.firefly.myflashlight;
  2 
  3 import android.app.Activity;
  4 import android.hardware.Camera;
  5 import android.hardware.Camera.Parameters;
  6 import android.hardware.Sensor;
  7 import android.hardware.SensorEvent;
  8 import android.hardware.SensorEventListener;
  9 import android.hardware.SensorManager;
 10 import android.os.Bundle;
 11 import android.os.Vibrator;
 12 import android.view.View;
 13 import android.widget.ImageView;
 14 import android.widget.Toast;
 15 
 16 public class MainActivity extends Activity {
 17     ImageView image;
 18     Boolean flag = false;
 19     Camera camera;
 20     Parameters params;
 21     // 传感器管理
 22     SensorManager sm;
 23     Vibrator v ;//震动
 24     sensorListener s;//传感器监听
 25 
 26     @Override
 27     protected void onCreate(Bundle savedInstanceState) {
 28         super.onCreate(savedInstanceState);
 29         requestWindowFeature(1);
 30         setContentView(R.layout.activity_main);
 31         image = (ImageView) findViewById(R.id.image);
 32         Shake();
 33     }
 34 
 35     private void Shake() {
 36         // 初始化数据
 37         sm = (SensorManager) getSystemService(SENSOR_SERVICE);
 38         v = (Vibrator) getSystemService(VIBRATOR_SERVICE);
 39         s = new sensorListener();
 40         sm.registerListener(s, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
 41                 SensorManager.SENSOR_DELAY_NORMAL);
 42     }
 43     
 44     //开/关按钮的点击事件
 45     public void init(View view) {
 46         Replese();
 47     }
 48     public void Replese(){
 49         if (flag == false) {
 50             camera = Camera.open();//打开相机
 51             params = camera.getParameters();////获取预览的各种分辨率
 52             params.setFlashMode(Parameters.FLASH_MODE_TORCH);
 53             camera.setParameters(params);
 54             camera.startPreview();
 55             Toast.makeText(getApplicationContext(), "别摇了，我又不是微信，摇不出妹子的！！", 0).show();
 56             Toast.makeText(getApplicationContext(), "电筒已开启", 0).show();
 57             image.setImageResource(R.drawable.off);//当相机打开之后按钮要变成关闭的颜色
 58             flag = true;
 59         } else {
 60             Toast.makeText(getApplicationContext(), "您还可以直接摇一摇打开手电筒哦！", 0).show();
 61             image.setImageResource(R.drawable.on);
 62             camera.stopPreview();
 63             camera.release();
 64             flag = false;
 65         }
 66     }
 67 
 68     @Override
 69     protected void onPause() {
 70         // TODO Auto-generated method stub
 71         sm.unregisterListener(s);
 72         super.onPause();
 73     }
 74 
 75     @Override
 76     protected void onStop() {
 77         // TODO Auto-generated method stub
 78         sm.unregisterListener(s);
 79         super.onStop();
 80     }
 81     
 82     //震动（传感器）监听事件
 83     private class sensorListener implements SensorEventListener {
 84 
 85         @Override
 86         public void onSensorChanged(SensorEvent event) {
 87             int sensorType = event.sensor.getType();
 88             float[] values = event.values;
 89             if (sensorType == Sensor.TYPE_ACCELEROMETER) {
 90                 //如果摇晃的力度在15
 91                 if (Math.abs(values[0]) > 15 || Math.abs(values[1]) > 15
 92                         || Math.abs(values[2]) > 15) {
 93                     Replese();//就把电筒打开
 94                     v.vibrate(200);
 95                 }
 96             }
 97         }
 98 
 99         @Override
100         public void onAccuracyChanged(Sensor sensor, int accuracy) {
101             // TODO Auto-generated method stub
102 
103         }
104 
105     }
106 }