Question

我正在尝试获取GPS位置并将其解析为String，然后将其解析为可点击的URL。我已经完成了获取位置的代码，但是由于获取位置可能需要一段时间，因此String在解析位置之前执行。我已经尝试过使用Process Dialogs等，但是我无法让它工作。

参见代码

公共类ConfirmScreen扩展了活动{

String mapCoord = "http://maps.google.com";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_confirm_screen);


    LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    LocationListener mLocListener = new MyLocationListener();
    mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, mLocListener);


    sendEmail();
    playSound();

}


public void backHome(View view) 
{
    Intent intent = new Intent (this, MainScreen.class);
    startActivity(intent);
}

// Method to start playing and looping a sound.

public void playSound()
{
    MediaPlayer clickSound = MediaPlayer.create(this, R.raw.warning);
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
    Boolean soundCheck = sp.getBoolean("SOUND", false);
    if (soundCheck)
    {
        clickSound.start();
    }



}// method end



public void sendEmail()
{
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
    String nameValue = sp.getString("NAME", "failed to get name");
    String emailValue = sp.getString("EMAIL", "failed to get email");
    Intent i = new Intent(Intent.ACTION_SEND);
    i.setType("message/rfc822");
    i.putExtra(Intent.EXTRA_EMAIL, new String[]{emailValue});
    i.putExtra(Intent.EXTRA_SUBJECT, "Email sent from DON'T PANIC - A Chris O'Brien Project");
    i.putExtra(Intent.EXTRA_TEXT, "Hi there\n" + nameValue + " is in mortal danger. Please see the co-ords attached and run to their rescue!" +
            " If you don't see any co-ords, they didn't check the box and assume you know where they are.\nKind Regards\nDon't Panic! \n\n\n" +  mapCoord);

    try
    {   startActivity(Intent.createChooser(i, "Send mail...."));
    } 
    catch (android.content.ActivityNotFoundException ex){

        Toast.makeText(ConfirmScreen.this, "There are no email clients installed or set up", Toast.LENGTH_SHORT).show();
    }
}

public class MyAsyncTask extends AsyncTask<Void, Void, Result>{

    private Activity activity;
    private ProgressDialog progressDialog;

    private double longitude;
    private double latitude;
    private String countryCode;

    public MyAsyncTask(Activity activity, double longitude, double latitude) {
        super();
        this.activity = activity;
        this.longitude = longitude;
        this.latitude = latitude;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        ProgressDialog.show(activity, "", "Looking for GPS satellites...");
    }

    @Override
    protected Result doInBackground(Void... v) {
        Geocoder geocoder = new Geocoder(activity, Locale.getDefault());
        List<Address> addresses;
        try {
            addresses = geocoder.getFromLocation(latitude, longitude, 1);
            countryCode = addresses.get(0).getAddressLine(2);
        }catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Toast.makeText(activity, "Location is not available, please try again later.", Toast.LENGTH_LONG).show();
        }
        if(countryCode==null){
            Toast.makeText(activity, "Location is not available, please try again later.", Toast.LENGTH_LONG).show();
        }
        Toast.makeText(activity, countryCode, Toast.LENGTH_LONG).show();
        return null;
    }

    @Override
    protected void onPostExecute(Result result) {
        progressDialog.dismiss();
        Toast.makeText(activity.getApplicationContext(), "Finished.", 
        Toast.LENGTH_LONG).show();
    }
    }



//Location Listener
public class MyLocationListener implements LocationListener
{


    @Override
    public void onLocationChanged(Location location) {
        double lng = location.getLatitude();
        double lat = location.getLongitude();
        MyAsyncTask task = new MyAsyncTask(ConfirmScreen.this, lng, lat);
        task.execute();
        Toast.makeText(getApplicationContext(), "Done :D", Toast.LENGTH_LONG).show();

        String text = "Current Location is \nLat: " + lng + " \nLng: " + lat;
        mapCoord =  Double.toString(lng) + " " + Double.toString(lat);

        Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderDisabled(String provider) {
        Toast.makeText(getApplicationContext(), "GPS Disabled", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onProviderEnabled(String provider) {
        Toast.makeText(getApplicationContext(), "GPS Enabled", Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }




}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_confirm_screen, menu);
    return true;
}






}

编译没有错误，但它不符合我的意图。我一直在阅读别人的代码并尝试自己实现，但我可能会弄乱一些东西。

1）onCreate获取位置 2）应该弹出一个对话框，直到收到GPS co-ords 3）这些co-ords应传递给String 4）与合作伙伴发送电子邮件（此工作正常） 5）如果选中复选框，则播放声音（再次启用）

我得到了合作伙伴，但困难在于电子邮件方法在应用程序有机会获得合作之前被调用。我不想使用lastKnownCo-ords。

Answer 1

1 /号onCreate要求在将来的某个时刻将位置提供给mLocListener，但无论如何在onCreate返回之后。 onCreate还会启动一个新的Activity来写一封电子邮件。在htis点没有检索到坐标。

2 /否。当收到 GPS坐标时，会打开一个对话框。

3 /完全没有。坐标传递给地理编码器并转换为地址。我不知道为什么你不使用这个地址（显示除外）

4 / No. coords字符串是在3 /中创建的，但电子邮件是以1 /发送的，因此很久以前。

您实际想要做的是在收到坐标后发送电子邮件，即在onLocationChanged方法中。

存储地图位置 - android

1 个答案: