Question

我希望用户按下按钮，按下按钮后gps应该在后台自动获取坐标，因为你知道gps可能需要几分钟才能获取坐标，我只想让gps花费时间并在获取坐标后执行一个名为的方法＆＃39; SendLocationSms＆＃39;，

如果我在doInBackground中使用onLocationChanged方法，则会出错，或者如果我在不使用异步任务的情况下获取坐标，那么我必须等待坐标，并且在获取之后我可以按下按钮来执行方法SendLocationSms，

我希望用户只需在gps打开时按一个按钮，然后gps花费时间来获取坐标，然后获取然后自动运行我想要的方法而不会注意到用户。

基本上我正在开发一个应用程序，通过短信按下警报按钮发送用户的位置，用户只需要打开GPS并按下警报按钮和应用程序应该做其余的，我不希望该用户等到gps获取坐标以发送警报。

请帮帮我

public class MainActivity extends AppCompatActivity implements LocationListener {


private LocationManager n;
private double lat;
private double lot;
private Button save;

private TextView textSMS;
private String gps;
private String sms;
public Button con;
DatabaseHelper myDb;

String id, cell1;




protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    con = (Button) findViewById(R.id.con);
    con.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(MainActivity.this, Contacts.class);
            startActivity(i);
        }
    });

    myDb = new DatabaseHelper(this);



    Cursor c = myDb.getAllData();
    c.moveToFirst();
    cell1 = (c.getString(1));



    save = (Button) findViewById(R.id.save);
    textSMS = (TextView) findViewById(R.id.editTextSMS);

    textSMS.setText("Help me please im at: [location]");
    sms="Help me please im at: ";







    n = (LocationManager) getSystemService(LOCATION_SERVICE);

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    n.requestLocationUpdates(LocationManager.GPS_PROVIDER, 60000, 100, this);


    save.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            if ( gps != null ) {



                try {
                    SmsManager smsManager = SmsManager.getDefault();
                    smsManager.sendTextMessage(cell1.toString(), null, sms + gps, null, null);
                    Toast.makeText(getApplicationContext(), "Your message sent successfuly !",
                            Toast.LENGTH_LONG).show();

                } catch (Exception e) {
                    Toast.makeText(getApplicationContext(),
                            "SMS failddddd!",
                            Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                }




        }
    });


}


@Override
public void onLocationChanged(final Location l) {

    this.lat=l.getLatitude();
    this.lot=l.getLongitude();
    this.gps = "\n" +
            "www.google.com/maps/place/"+lat+","+lot;

    TextView locc = (TextView) findViewById(R.id.locc);
    locc.setTextColor(Color.GREEN);
    locc.setText("New Location Fetched !");




    Toast.makeText(getApplicationContext(), "Location done", Toast.LENGTH_LONG).show();








        }






@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

    Toast.makeText(getBaseContext(),"Gps enabled",Toast.LENGTH_LONG).show();




}

@Override
public void onProviderDisabled(String provider) {


    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(intent);
    Toast.makeText(getBaseContext(), "Gps is turned off!! ",
            Toast.LENGTH_SHORT).show();



}

public void showMessage(String title,String Message){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(Message);
    builder.show();
}

}

听，点击活动按钮，我想通过短信发送经度和纬度，我打开gps，然后按下按钮，但是你知道gps需要一两分钟来获取坐标，所以如果我按下按钮之前得到坐标的课程它会发送null作为纬度和经度，所以我想如果仍然gps没有坐标但用户按下按钮，然后应用程序等待直到获取位置然后发送包含纬度和经度的短信。所以这是详细的:)希望现在你可以帮助我，非常感谢

Answer 1

在您的活动中，您需要记录当前位置。

...
private Location currentLocation;   
...

@Override
public void onLocationChanged(Location location) {      

    currentLocation = location;     

}

当用户通过短信点击发送位置时，您现在可以在asyncTask中使用此变量。

请不要忘记代码中的某个地方请求位置更新，例如：

LocationRequest REQUEST = LocationRequest.create()  // LocationRequest parameters definition.
        .setInterval(30000)         
        .setFastestInterval(16)    // 16ms = 60fps
        .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

if(googleApiClient.isConnected()){ 
           LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, REQUEST, this);
}

修改你可以以下。添加一个布尔值，通知用户想要发送当前位置，当位置准备就绪时，您可以发送它。因此，您必须以这种方式修改onclick侦听器和位置更新侦听器：

... private boolean needSendSMS = false; ... save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if ( gps != null ) { try { SmsManager smsManager = SmsManager.getDefault(); smsManager.sendTextMessage(cell1.toString(), null, sms + gps, null, null); Toast.makeText(getApplicationContext(), "Your message sent successfuly !", Toast.LENGTH_LONG).show(); } catch (Exception e) { Toast.makeText(getApplicationContext(), "SMS failddddd!", Toast.LENGTH_LONG).show(); e.printStackTrace(); } else{ needSendSMS = true; } } ... @Override public void onLocationChanged(Location l) { this.lat=l.getLatitude(); this.lot=l.getLongitude(); if ( needSendSMS) { needSendSMS=false; // Send your sms like you did before. } }

使用异步任务在后台获取经度和纬度

1 个答案: