Android實現搖一搖功能_Android

實現“搖一搖”功能，其實很簡單，就是檢測手機的重力感應，具體實現代碼如下：

1、在 AndroidManifest.xml 中添加操作許可權

2、實現代碼

 package com.xs.test;  import android.app.Activity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.Vibrator; import android.util.Log; import android.widget.Toast;  /**  * 安卓晃動手機監聽--“搖一搖”  *  * @author 單紅宇  *  */ public class TestSensorActivity extends Activity {    private SensorManager sensorManager;   private Vibrator vibrator;    private static final String TAG = "TestSensorActivity";   private static final int SENSOR_SHAKE = 10;    /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);     vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);   }    @Override   protected void onResume() {     super.onResume();     if (sensorManager != null) {// 註冊監聽器       sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);       // 第一個參數是Listener，第二個參數是所得感應器類型，第三個參數值擷取感應器資訊的頻率     }   }    @Override   protected void onPause() {     super.onPause();     if (sensorManager != null) {// 取消監聽器       sensorManager.unregisterListener(sensorEventListener);     }   }    /**    * 重力感應監聽    */   private SensorEventListener sensorEventListener = new SensorEventListener() {      @Override     public void onSensorChanged(SensorEvent event) {       // 感應器資訊改變時執行該方法       float[] values = event.values;       float x = values[0]; // x軸方向的重力加速度，向右為正       float y = values[1]; // y軸方向的重力加速度，向前為正       float z = values[2]; // z軸方向的重力加速度，向上為正       Log.i(TAG, "x軸方向的重力加速度" + x + "；y軸方向的重力加速度" + y + "；z軸方向的重力加速度" + z);       // 一般在這三個方向的重力加速度達到40就達到了搖晃手機的狀態。       int medumValue = 19;// 三星 i9250怎麼晃都不會超過20，沒辦法，只設定19了       if (Math.abs(x) > medumValue || Math.abs(y) > medumValue || Math.abs(z) > medumValue) {         vibrator.vibrate(200);         Message msg = new Message();         msg.what = SENSOR_SHAKE;         handler.sendMessage(msg);       }     }      @Override     public void onAccuracyChanged(Sensor sensor, int accuracy) {      }   };    /**    * 動作執行    */   Handler handler = new Handler() {      @Override     public void handleMessage(Message msg) {       super.handleMessage(msg);       switch (msg.what) {       case SENSOR_SHAKE:         Toast.makeText(TestSensorActivity.this, "檢測到搖晃，執行操作！", Toast.LENGTH_SHORT).show();         Log.i(TAG, "檢測到搖晃，執行操作！");         break;       }     }    }; } 

這種搖一搖比較普通，沒有經過演算法的加強，重力加速度就是10。
演算法最佳化如下

package com.example.url;import java.io.IOException;import java.net.URL;import com.hahashijie.imageload.ImageLoader;import android.annotation.SuppressLint;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.Drawable;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.Vibrator;import android.util.Log;import android.widget.ImageView;@SuppressLint("HandlerLeak")public class MainActivity extends Activity {private ImageView image;private SensorManager sensorManager;private Sensor sensor;private Vibrator vibrator;private static final int UPTATE_INTERVAL_TIME = 50;private static final int SPEED_SHRESHOLD = 30;//這個值調節靈敏度private long lastUpdateTime;private float lastX;private float lastY;private float lastZ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);image = (ImageView) findViewById(R.id.image);}@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();if (sensorManager != null) {      sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);    }    if (sensor != null) {    sensorManager.registerListener(sensorEventListener,    sensor,SensorManager.SENSOR_DELAY_GAME);//這裡選擇感應頻率    }}/*** 重力感應監聽*/private SensorEventListener sensorEventListener = new SensorEventListener() {@Overridepublic void onSensorChanged(SensorEvent event) {long currentUpdateTime = System.currentTimeMillis();long timeInterval = currentUpdateTime - lastUpdateTime;if (timeInterval < UPTATE_INTERVAL_TIME) {return;}lastUpdateTime = currentUpdateTime;// 感應器資訊改變時執行該方法float[] values = event.values;float x = values[0]; // x軸方向的重力加速度，向右為正float y = values[1]; // y軸方向的重力加速度，向前為正float z = values[2]; // z軸方向的重力加速度，向上為正float deltaX = x - lastX;float deltaY = y - lastY;float deltaZ = z - lastZ;lastX = x;lastY = y;lastZ = z;double speed = (Math.sqrt(deltaX * deltaX + deltaY * deltaY+ deltaZ * deltaZ) / timeInterval) * 100;if (speed >= SPEED_SHRESHOLD) {vibrator.vibrate(300);image.setImageResource(R.drawable.running01);}}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {}};}

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