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
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package com.xs.test;
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import android.app.Activity;
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import android.hardware.Sensor;
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import android.hardware.SensorEvent;
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import android.hardware.SensorEventListener;
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import android.hardware.SensorManager;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.os.Vibrator;
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import android.util.Log;
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import android.widget.Toast;
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public class TestSensorActivity extends Activity {
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private SensorManager sensorManager;
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private Vibrator vibrator;
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private static final String TAG = "TestSensorActivity";
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private static final int SENSOR_SHAKE = 10;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
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vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
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}
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@Override
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protected void onResume() {
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super.onResume();
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if (sensorManager != null) {
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sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
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}
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}
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@Override
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protected void onPause() {
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super.onPause();
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if (sensorManager != null) {
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sensorManager.unregisterListener(sensorEventListener);
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}
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}
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private SensorEventListener sensorEventListener = new SensorEventListener() {
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@Override
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public void onSensorChanged(SensorEvent event) {
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float[] values = event.values;
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float x = values[0];
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float y = values[1];
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float z = values[2];
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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);
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int medumValue = 19;
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if (Math.abs(x) > medumValue || Math.abs(y) > medumValue || Math.abs(z) > medumValue) {
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vibrator.vibrate(200);
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Message msg = new Message();
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msg.what = SENSOR_SHAKE;
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handler.sendMessage(msg);
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}
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}
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@Override
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public void onAccuracyChanged(Sensor sensor, int accuracy) {
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}
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};
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Handler handler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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super.handleMessage(msg);
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switch (msg.what) {
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case SENSOR_SHAKE:
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Toast.makeText(TestSensorActivity.this, "检测到摇晃，执行操作！", Toast.LENGTH_SHORT).show();
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Log.i(TAG, "检测到摇晃，执行操作！");
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break;
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}
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}
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};
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}
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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。
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算法优化如下
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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) {
}
};
}
android 实现摇一摇功能
原文：http://blog.csdn.net/chenaini119/article/details/45888361
