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：
1、在 androidmanifest.xml 中添加操作权限
2、实现代码
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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;
/**
* 安卓晃动手机监听--“摇一摇”
*
* @author 单红宇
*
*/
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) {// 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
protected void onpause() {
super.onpause();
if (sensormanager != null) {// 取消监听器
sensormanager.unregisterlistener(sensoreventlistener);
}
}
/**
* 重力感应监听
*/
private sensoreventlistener sensoreventlistener = new sensoreventlistener() {
@override
public void onsensorchanged(sensorevent event) {
// 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
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。
int medumvalue = 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);
message msg = new message();
msg.what = sensor_shake;
handler.sendmessage(msg);
}
}
@override
public void onaccuracychanged(sensor sensor, int accuracy) {
}
};
/**
* 动作执行
*/
handler handler = new handler() {
@override
public void handlemessage(message msg) {
super.handlemessage(msg);
switch (msg.what) {
case sensor_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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