当屏幕休眠时,如何让android应用程序在后台运行?
我正在开发一个跟踪应用程序,通过每3秒获取用户的当前位置来跟踪用户。当屏幕打开时,我能够获取lat long值。但当屏幕休眠时。我无法获取数据 代码:当屏幕休眠时,如何让android应用程序在后台运行?,android,google-maps,background-process,android-maps,android-wake-lock,Android,Google Maps,Background Process,Android Maps,Android Wake Lock,我正在开发一个跟踪应用程序,通过每3秒获取用户的当前位置来跟踪用户。当屏幕打开时,我能够获取lat long值。但当屏幕休眠时。我无法获取数据 代码: @Override public void onLocationChanged(Location location) { mLastLocation = location; if (mCurrLocationMarker != null) { mCurrLocationMarker.remove();
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null)
{
mCurrLocationMarker.remove();
}
latitude = location.getLatitude();
longitude = location.getLongitude();
latLngcurrent = new LatLng(location.getLatitude(), location.getLongitude());
Toast.makeText(context,String.valueOf(latitude)+" "+String.valueOf(longitude), Toast.LENGTH_LONG).show();
Log.d("onLocationChanged", String.format("latitude:%.3f longitude:%.3f",latitude,longitude));
Log.d("onLocationChanged", "Exit");
Toast.makeText(this, "exiting LocationChanged ", Toast.LENGTH_SHORT).show();
}
上面给出的onLocationChanged方法每3秒获取一次lat-lon值。即使屏幕处于休眠状态,我应该如何使此方法运行。我读过关于Wakelock的文章,但我不知道如何实现它,任何帮助都将不胜感激。提前谢谢
注意:当多任务完成时,应用程序运行良好,每3秒使用作业调度程序获取位置。当屏幕睡眠时,应用程序也会运行。即使屏幕睡眠或应用程序未打开,您也需要使用
服务获取位置更新
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
public class MyLocationService extends Service
{
private static final String TAG = "MyLocationService";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = 3000;
private static final float LOCATION_DISTANCE = 10f;
LocationListener[] mLocationListeners = new LocationListener[] {
new LocationListener(LocationManager.GPS_PROVIDER),
new LocationListener(LocationManager.NETWORK_PROVIDER)
};
@Override
public IBinder onBind(Intent arg0)
{
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.e(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
public void onCreate()
{
Log.e(TAG, "onCreate");
initializeLocationManager();
try {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "network provider does not exist, " + ex.getMessage());
}
try {
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "gps provider does not exist " + ex.getMessage());
}
}
@Override
public void onDestroy()
{
Log.e(TAG, "onDestroy");
super.onDestroy();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listners, ignore", ex);
}
}
}
}
private void initializeLocationManager() {
Log.e(TAG, "initializeLocationManager");
if (mLocationManager == null) {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
}
}
// create LocationListener class to get location updates
private class LocationListener implements android.location.LocationListener
{
Location mLastLocation;
public LocationListener(String provider)
{
Log.e(TAG, "LocationListener " + provider);
mLastLocation = new Location(provider);
}
@Override
public void onLocationChanged(Location location)
{
Log.e(TAG, "onLocationChanged: " + location);
mLastLocation.set(location);
}
@Override
public void onProviderDisabled(String provider)
{
Log.e(TAG, "onProviderDisabled: " + provider);
}
@Override
public void onProviderEnabled(String provider)
{
Log.e(TAG, "onProviderEnabled: " + provider);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
Log.e(TAG, "onStatusChanged: " + provider);
}
}
}
不要忘记在您的AndroidManifest.xml
文件中添加以下两个权限:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
更新:
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null)
{
mCurrLocationMarker.remove();
}
latitude = location.getLatitude();
longitude = location.getLongitude();
latLngcurrent = new LatLng(location.getLatitude(), location.getLongitude());
Toast.makeText(context,String.valueOf(latitude)+" "+String.valueOf(longitude), Toast.LENGTH_LONG).show();
Log.d("onLocationChanged", String.format("latitude:%.3f longitude:%.3f",latitude,longitude));
Log.d("onLocationChanged", "Exit");
Toast.makeText(this, "exiting LocationChanged ", Toast.LENGTH_SHORT).show();
}
即使在设备屏幕关闭后,您也需要保持运行服务
如果您持有部分唤醒锁,CPU将继续运行,而不管任何显示超时或屏幕状态,甚至在用户按下电源按钮之后
要获取唤醒锁,请执行以下操作:
PowerManager mgr = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
wakeLock.acquire();
要发布它:
wakeLock.release();
尝试使用或并实现
使用服务使用Wakelog和服务类来完成用户意图服务而不是标题服务用于短任务。他需要不断地获取位置信息。如果手机在较新的设备上进入打盹模式,上述任何一项都不起作用,甚至连唤醒锁都会被忽略。考虑到电池耗竭必须持续唤醒CPU和每3秒轮询一次,如果用户使用了大量电池,这将是一次糟糕的体验。是否可以实现服务而不是扩展@Priyank@RakeshPolo是一个应用程序组件,可以在后台执行长时间运行的操作。因此,您需要扩展类来实现它。在这里查看更多关于我需要从具有xml设计的类中获取位置的详细信息。所以我需要扩展应用程序的活动。给我一些IDE,介绍如何添加上述代码并使其工作@Priyank@RakeshPolo您可以使用startService()
方法从活动启动服务。检查我的最新答案。谢谢你的耐心。我创建了一个名为MyLocationService的类,并使用了您的代码。在Oncreate包内的主要活动中,我使用了intent来调用位置服务。但我仍然无法从MainActivity类访问MyLocationService类。我已在清单中授予权限和服务标记@Priyankthis仅在API21+中可用是标记作业调度程序仅在API21+中可用我知道。。所以我的评论…?我使用了服务并实现了LocationListener,但现在得到了这个,你能理解吗@用户12345
wakeLock.release();
@Override
public void onLocationChanged(Location location) {
mLastLocation = location;
if (mCurrLocationMarker != null)
{
mCurrLocationMarker.remove();
}
latitude = location.getLatitude();
longitude = location.getLongitude();
latLngcurrent = new LatLng(location.getLatitude(),location.getLongitude());
Toast.makeText(context,String.valueOf(latitude)+" "+String.valueOf(longitude), Toast.LENGTH_LONG).show();
Log.d("onLocationChanged", String.format("latitude:%.3f longitude:%.3f",latitude,longitude));
Log.d("onLocationChanged", "Exit");
Toast.makeText(this, "exiting LocationChanged ", Toast.LENGTH_SHORT).show();
}