抖动和GPS问题的背景感应 [英] background sensing of shake and GPS problems
问题描述
MainAcivity.java
MainAcivity.java
package com.example.background_shake;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Intent;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
Button ON,OFF;
private SensorManager sensorManager;
private long lastUpdate;
Intent i1;
public static final String TAG = "ServicesDemo";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
//reseting the window propertys
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
//super method
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ON=(Button)findViewById(R.id.ON);
OFF=(Button)findViewById(R.id.OFF);
ON.setOnClickListener(this);
OFF.setOnClickListener(this);
}
public void onClick(View src) {
switch (src.getId()) {
case R.id.ON:
Log.d(TAG, "onClick: starting srvice");
startService(new Intent(this, Background_service.class));
break;
case R.id.OFF:
Log.d(TAG, "onClick: stopping srvice");
stopService(new Intent(this, Background_service.class));
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Background_service.java
Background_service.java
package com.example.background_shake;
import java.util.List;
import java.util.Locale;
import android.app.Service;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Address;
import android.location.Geocoder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class Background_service extends Service implements SensorEventListener{
boolean flag=false;
private long lastUpdate;
SensorManager sensorManager;
int count=0;
@Override
public IBinder onBind(Intent intent) {
return null;
}
public void onCreate()
{
flag=true;
Log.d(MainActivity.TAG, "onCreate");
super.onCreate();
}
public void onDestroy() {
flag=false;
Log.d(MainActivity.TAG, "onDestroy");
super.onDestroy();
}
public void onStart(Intent intent, int startId)
{
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
lastUpdate = System.currentTimeMillis();
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
private void getAccelerometer(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float[] values = event.values;
// Movement
float x = values[0];
float y = values[1];
float z = values[2];
double latitude=0;
double longitude=0;
String location_message;
GPSTracker gps;
float accelationSquareRoot = (x * x + y * y + z * z)
/ (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);
long actualTime = System.currentTimeMillis();
if (accelationSquareRoot >= 2) //
{
if (actualTime - lastUpdate < 2000) {
count++;
return;
}
lastUpdate = actualTime;
{
gps=new GPSTracker(Background_service.this);
if((gps.canGetLocation())&&(count==3)){
count=0;
latitude = gps.getLatitude();
longitude = gps.getLongitude();
// \n is for new line
// Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
Geocoder gcd = new Geocoder(Background_service.this, Locale.getDefault());
try{
List<Address> addresses = gcd.getFromLocation(latitude, longitude, 1);
location_message= addresses.get(0).getLocality();
if ((addresses.size() > 0)&&(flag))
{
Toast.makeText(getApplicationContext(), "Your Location is " +addresses.get(0).getLocality()
, Toast.LENGTH_LONG).show();
count=0;
}
}catch(Exception e)
{
System.out.print(e);
}
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
Toast.makeText(getApplicationContext(), "Switch on gps"
, Toast.LENGTH_LONG).show();
gps.showSettingsAlert();
}}
/*Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT)
.show();
if (color) {
view.setBackgroundColor(Color.GREEN);
} else {
view.setBackgroundColor(Color.RED);
}*/
}}
}
public void onSensorChanged(SensorEvent event) {
getAccelerometer(event);
}
protected void onResume() {
//super.onResume();
// register this class as a listener for the orientation and
// accelerometer sensors
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause()
{
// unregister listener
sensorManager.unregisterListener(this);
}
}
上面的代码用于感测震动参数并为您提供当前位置的应用。
但是问题是即使我的GPS关闭了，我也正在获取当前位置。
The above code is for an app that senses the shake parameter and gives you the current location. But the problem is even though my GPS is off i am getting my current location.
我还想知道两件事
1.是否即使您锁定了手机，服务也可以正常工作。如果没有，则必须对我的代码进行哪些修改才能使其正常工作？
2.如果我摇动手机一次，我的应用程序就会输出输出，但是我希望我的应用程序只有连续摇动3-4次，才能给出想要的结果。是否可以做到？
Also i want to know two things 1. Does a Service work even if you lock your phone?If no, what modifications must be made to my code so that it works? 2. My app gives the output if i shake my mobile once but i want my app to give the desired result only if i shake it continuously for 3-4 times.Is it possible to do that?
推荐答案
akajaymo已经在这里回答了Q1。
Q1 is already answered here by akajaymo.
对于Q2，而不是每次摇动手机时，应用都会产生所需的输出，创建两个静态变量 int count 和 long last 。
For Q2, instead of having the app produce the desired output every time the phone is shaken, create two static variables int count and long last.
每次摇动电话时，您都要检查（System.currentTimeMillis（）-last）是否<考虑到抖动的1000 / *相隔不超过1秒* / ，如果是，则增加计数。
Every time the phone is shaken, you check to see if (System.currentTimeMillis() - last) < 1000/* considering the shakes are not more than 1 second apart */ and, if so, you increase count.
如果计数达到3或4，就可以了：只需生成所需的输出即可。如果不是，则什么也不会产生。
If count reaches 3 or 4, you're done: just produce the desired output. If not, produce nothing.
如果抖动间隔超过1000ms，只需将 count 设置为1。
If the shakes are more than 1000ms apart, just set count to 1.
此外，每次检测到抖动时，请使 last = System.currentTimeMillis（）。最后一次更新必须在我提到的第一个检查之后 完成。
Also, every time you detect a shake, make last = System.currentTimeMillis(). This update to last must be done after the first check that I mentioned.
这篇关于抖动和GPS问题的背景感应的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
