可能是重复问题：
如何在Android中后台运行应用程序？
我正在使用位置管理器进行项目开发。如果我的位置纬度和经度与数据库中的相同，则手机配置文件应该进入静音模式。因此，我需要使用位置管理器不断更新我的位置。我已经做到了，但是如果我关闭我的应用程序，它就无法工作。 但是，即使我关闭我的应用程序，我的应用程序也应该继续运行。我尝试使用异步任务，当我关闭应用程序时它可以工作，但是当我手动切换到响铃模式后，它无法切换到静音模式。我还应该在后台运行我的应用程序时收到通知。请帮忙，谢谢。
这是我的代码：
public class ShowLocationActivity extends Activity implements LocationListener {
private TextView latituteField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
double lat,lng;
Location location;
AudioManager mobilemode ;
private Boolean flag = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
latituteField = (TextView) findViewById(R.id.TextView02);
longitudeField = (TextView) findViewById(R.id.TextView04);
mobilemode = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
flag = displayGpsStatus();
if (flag) {
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
if((lat==12.905478)&&(lng==80.093358))
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
Toast.makeText(getBaseContext(),"VIBRATE profile activated ",Toast.LENGTH_SHORT).show();
}
else if ((lat==12.90080625)&&(lng==80.09210655))
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_SILENT);
Toast.makeText(getBaseContext(),"SILENT profile activated !",Toast.LENGTH_SHORT).show();
//notification.setLatestEventInfo(ShowLocationActivity.this, "changed to silent mode", "because u r in office", pendingIntent);
// notificationManager.notify(i, notification);
}
else
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
Toast.makeText(getBaseContext(),"LOUD profile activated !",Toast.LENGTH_SHORT).show();
}
}
else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
else {
alertbox("Gps Status!!", "Your GPS is: OFF");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.location, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_settings:
Intent intent = new Intent( ShowLocationActivity.this,SetPreference.class);
startActivityForResult(intent, 0);
checkPref();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void checkPref(){
SharedPreferences myPref
= PreferenceManager.getDefaultSharedPreferences(ShowLocationActivity.this);
String _pref =
"Option 1: " + myPref.getBoolean("pref_opt1", true);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
checkPref();
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
lat = (double) (location.getLatitude());
lng = (double) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
public void rrr(View v)
{
DownloadTask n= new DownloadTask();
n.doInBackground();
}
public void onDestroy()
{
super.onDestroy();
Log.v("hhh","on destroy");
DownloadTask n= new DownloadTask();
n.doInBackground();
}
public Boolean displayGpsStatus() {
ContentResolver contentResolver = getBaseContext().getContentResolver();
boolean gpsStatus = Settings.Secure.isLocationProviderEnabled(
contentResolver, LocationManager.GPS_PROVIDER);
if (gpsStatus) {
return true;
} else {
return false;
}
}
/*----------Method to create an AlertBox ------------- */
protected void alertbox(String title, String mymessage) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Your Device's GPS is Disable")
.setCancelable(false)
.setTitle("** Gps Status **")
.setPositiveButton("Gps On",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// finish the current activity
// AlertBoxAdvance.this.finish();
Intent myIntent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(myIntent);
dialog.cancel();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// cancel the dialog box
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
public class DownloadTask extends AsyncTask<Integer, Integer, Void> {
@Override
protected Void doInBackground(Integer... params) {
Log.v("hhh","back");
onCreate(null);
// onLocationChanged(location);
/*
lat = (double) (location.getLatitude());
lng = (double) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
if((lat==12.905478)&&(lng==80.093358))
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
Toast.makeText(getBaseContext(),"VIBRATE profile activated ",Toast.LENGTH_SHORT).show();
}
else if ((lat==12.90080625)&&(lng==80.09210655))
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_SILENT);
Toast.makeText(getBaseContext(),"SILENT profile activated !",Toast.LENGTH_SHORT).show();
//notification.setLatestEventInfo(ShowLocationActivity.this, "changed to silent mode", "because u r in office", pendingIntent);
// notificationManager.notify(i, notification);
}
else
{
mobilemode.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
Toast.makeText(getBaseContext(),"LOUD profile activated !",Toast.LENGTH_SHORT).show();
}
}
else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
// TODO Auto-generated method stub
*/
return null;
}
}
}