android 实现摇一摇功能

实现“摇一摇”功能，其实很简单，就是检测手机的重力感应，具体实现代码如下：

一、在 AndroidManifest.xml 中添加操作权限

<uses-permission android:name="android.permission.VIBRATE"/>

二、实现代码

[java] view plain copy

packagecom.xs.test;
importandroid.app.Activity;
importandroid.hardware.Sensor;
importandroid.hardware.SensorEvent;
importandroid.hardware.SensorEventListener;
importandroid.hardware.SensorManager;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.os.Vibrator;
importandroid.util.Log;
importandroid.widget.Toast;
/**
*安卓晃动手机监听--“摇一摇”
*
*@author单红宇
*
*/
publicclassTestSensorActivityextendsActivity{
privateSensorManagersensorManager;
privateVibratorvibrator;
privatestaticfinalStringTAG="TestSensorActivity";
privatestaticfinalintSENSOR_SHAKE=10;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
vibrator=(Vibrator)getSystemService(VIBRATOR_SERVICE);
}
@Override
protectedvoidonResume(){
super.onResume();
if(sensorManager!=null){//注册监听器
sensorManager.registerListener(sensorEventListener,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_NORMAL);
//第一个参数是Listener，第二个参数是所得传感器类型，第三个参数值获取传感器信息的频率
}
}
@Override
protectedvoidonPause(){
super.onPause();
if(sensorManager!=null){//取消监听器
sensorManager.unregisterListener(sensorEventListener);
}
}
/**
*重力感应监听
*/
privateSensorEventListenersensorEventListener=newSensorEventListener(){
@Override
publicvoidonSensorChanged(SensorEventevent){
//传感器信息改变时执行该方法
float[]values=event.values;
floatx=values[0];//x轴方向的重力加速度，向右为正
floaty=values[1];//y轴方向的重力加速度，向前为正
floatz=values[2];//z轴方向的重力加速度，向上为正
Log.i(TAG,"x轴方向的重力加速度"+x+"；y轴方向的重力加速度"+y+"；z轴方向的重力加速度"+z);
//一般在这三个方向的重力加速度达到40就达到了摇晃手机的状态。
intmedumValue=19;//三星i9250怎么晃都不会超过20，没办法，只设置19了
if(Math.abs(x)>medumValue||Math.abs(y)>medumValue||Math.abs(z)>medumValue){
vibrator.vibrate(200);
Messagemsg=newMessage();
msg.what=SENSOR_SHAKE;
handler.sendMessage(msg);
}
}
@Override
publicvoidonAccuracyChanged(Sensorsensor,intaccuracy){
}
};
/**
*动作执行
*/
Handlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
super.handleMessage(msg);
switch(msg.what){
caseSENSOR_SHAKE:
Toast.makeText(TestSensorActivity.this,"检测到摇晃，执行操作！",Toast.LENGTH_SHORT).show();
Log.i(TAG,"检测到摇晃，执行操作！");
break;
}
}
};
}
这种摇一摇比较普通，没有经过算法的加强，重力加速度就是10。
算法优化如下
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;//这个值调节灵敏度
private long lastUpdateTime;
private float lastX;
private float lastY;
private float lastZ;
@Override
protected 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);

}

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
if (sensorManager != null) {
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
}
if (sensor != null) {
sensorManager.registerListener(sensorEventListener,
sensor,
SensorManager.SENSOR_DELAY_GAME);//这里选择感应频率
}
}

/**
* 重力感应监听
*/
private SensorEventListener sensorEventListener = new SensorEventListener() {

@Override
public void onSensorChanged(SensorEvent event) {
long currentUpdateTime = System.currentTimeMillis();
long timeInterval = currentUpdateTime - lastUpdateTime;
if (timeInterval < UPTATE_INTERVAL_TIME) {
return;
}
lastUpdateTime = currentUpdateTime;
// 传感器信息改变时执行该方法
float[] values = event.values;
float x = values[0]; // x轴方向的重力加速度，向右为正
float y = values[1]; // y轴方向的重力加速度，向前为正
float z = values[2]; // z轴方向的重力加速度，向上为正
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);
}
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}
};

}

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