Android:如何捕获 GPS 位置的图像

Android : how to capture a image of GPS location(Android:如何捕获 GPS 位置的图像)

问题描述

I am using Google Maps for finding the location on a provided address.

I want to store the image of location which I get from Google Maps onClick.

Does anyone know how to do this?

Here is my code for google map & storing onClick

public class TestGPSActivity extends MapActivity 
 {    
MapView mapView;
private MapController mc;
private GeoPoint p;
private double lng;
private double lat;
private Address address;
private View mCurrentUrlMask;
private File imageFile; 

class MapOverlay extends com.google.android.maps.Overlay
{
    @Override
    public boolean draw(Canvas canvas, MapView mapView, 
            boolean shadow, long when) 
    {
        super.draw(canvas, mapView, shadow);                   

        //---translate the GeoPoint to screen pixels---
        Point screenPts = new Point();
        mapView.getProjection().toPixels(p, screenPts);

        //---add the marker---
        Bitmap bmp = BitmapFactory.decodeResource(
                getResources(), R.drawable.pin);            
        canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);         
        return true;
    }
} 
public boolean onTouchEvent(MotionEvent event, MapView mapView) 
{   
    //---when user lifts his finger---
    if (event.getAction() == 1) {                
        GeoPoint p = mapView.getProjection().fromPixels(
                (int) event.getX(),
                (int) event.getY());

        Geocoder geoCoder = new Geocoder(
                getBaseContext(), Locale.getDefault());
        try {
            List<Address> addresses = geoCoder.getFromLocation(
                    p.getLatitudeE6()  / 1E6, 
                    p.getLongitudeE6() / 1E6, 1);

            String add = "";
            if (addresses.size() > 0) 
            {
                for (int i=0; i<addresses.get(0).getMaxAddressLineIndex(); 
                        i++)
                    add += addresses.get(0).getAddressLine(i) + "
";
            }

            Toast.makeText(getBaseContext(), add, Toast.LENGTH_LONG).show();
        }
        catch (IOException e) {                
            e.printStackTrace();
        }   
        return true;
    }
    else                
        return false;
}             


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gps_main);

    mapView = (MapView) findViewById(R.id.mapView); 

    mapView.setDrawingCacheEnabled(true);


     // image naming and path  to include sd card  appending name you choose for file
    String mPath = Environment.getExternalStorageDirectory().toString() + "/" + GPSActivity.DIRECTORY;   

    // create bitmap screen capture
    Bitmap bitmap;

    View v1 = mapView.getRootView();

    v1.setDrawingCacheEnabled(true);

    bitmap = Bitmap.createBitmap(v1.getDrawingCache());
    v1.setDrawingCacheEnabled(false);

    OutputStream fout = null;
    imageFile = new File(DemoCamGPSActivity.DIRECTORY);

    try {
        fout = new FileOutputStream(imageFile);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fout);
        fout.flush();
        fout.close();

    } catch (FileNotFoundException e) {
        System.out.println("in file not found");
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }



    LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);  
    View zoomView = mapView.getZoomControls();


    zoomLayout.addView(zoomView, 
            new LinearLayout.LayoutParams(
                    LayoutParams.WRAP_CONTENT, 
                    LayoutParams.WRAP_CONTENT)); 
    mapView.displayZoomControls(true);

    mc = mapView.getController();

    Geocoder geocoder = new Geocoder(this, Locale.getDefault());
    List<Address> addresses = null;
    try {   

        addresses = geocoder.getFromLocationName(getIntent().getStringExtra("address"), 1);

    } catch (IOException e) {



    }

    try{ 
        address = addresses.get(0);  
    }
    catch (Exception e) {
        flash("Unable to locate given address");
        startActivity(new Intent(this, GPSMainActivity.class));
        finish();
    }
    try{
      lng  = address.getLongitude();
      lat  = address.getLatitude();   

      GPSActivity.writeLog(getIntent().getStringExtra("address") +" GPS co-ordibnates : "+lat+" , "+lng);
    }catch (Exception e) {


    }


    p = new GeoPoint(
            (int) (lat * 1E6), 
            (int) (lng * 1E6));

    mc.animateTo(p);
    mc.setZoom(17); 

    //---Add a location marker---
    MapOverlay mapOverlay = new MapOverlay();
    List<Overlay> listOfOverlays = mapView.getOverlays();
    listOfOverlays.clear();
    listOfOverlays.add(mapOverlay);        

    mapView.invalidate();
    mapView.invalidate();        
}
private void flash(String data) {   
    Toast.makeText(getApplicationContext(), data, Toast.LENGTH_LONG).show();
}


@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub    
    return false;
}

public boolean onKeyDown(int keyCode, KeyEvent event) 
{
    if(keyCode == KeyEvent.KEYCODE_BACK)
    {
        startActivity(new Intent(this, GPSMainActivity.class));
        finish();
    }

    return super.onKeyDown(keyCode, event);
}    
 }

I am getting this error

03-28 16:54:12.580: E/AndroidRuntime(30010): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mentha.Demo/com.mentha.Demo.TestGPSActivity}: java.lang.NullPointerException

I am getting error on this perticular codes

   // create bitmap screen capture
    Bitmap bitmap;

    View v1 = mapView.getRootView();

    v1.setDrawingCacheEnabled(true);

    bitmap = Bitmap.createBitmap(v1.getDrawingCache());
    v1.setDrawingCacheEnabled(false);

    OutputStream fout = null;
    imageFile = new File(DemoCamGPSActivity.DIRECTORY);

    try {
        fout = new FileOutputStream(imageFile);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fout);
        fout.flush();
        fout.close();

    } catch (FileNotFoundException e) {
        System.out.println("in file not found");
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


    Uri uri = Uri.fromFile(new File(mPath));

Please help me out.. thanks in advance

I have solved this problem. I was having problem with image capturing of GPS location. I have just created the capture menu, In which after uploading the GPS location one can capture the image by clicking on capture menu button.

Here is the whole code for capturing the screenshot of GPS location & how to find GPS location.

public class TestGPSActivity extends MapActivity 
{    
MapView mapView;
private MapController mc;
private GeoPoint p;
private double lng;
private double lat;
private Address address; 

//google Map
class MapOverlay extends com.google.android.maps.Overlay
{
    @Override
    public boolean draw(Canvas canvas, MapView mapView, 
            boolean shadow, long when) 
    {
        super.draw(canvas, mapView, shadow);                   

        //---translate the GeoPoint to screen pixels---
        Point screenPts = new Point();
        mapView.getProjection().toPixels(p, screenPts);

        //---add the marker---
        Bitmap bmp = BitmapFactory.decodeResource(
                getResources(), R.drawable.pin);            
        canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);         
        return true;
    }
} 
public boolean onTouchEvent(MotionEvent event, MapView mapView) 
{   
    //---when user lifts his finger---
    if (event.getAction() == 1) {                
        GeoPoint p = mapView.getProjection().fromPixels(
                (int) event.getX(),
                (int) event.getY());

        Geocoder geoCoder = new Geocoder(
                getBaseContext(), Locale.getDefault());
        try {
            List<Address> addresses = geoCoder.getFromLocation(
                    p.getLatitudeE6()  / 1E6, 
                    p.getLongitudeE6() / 1E6, 1);

            String add = "";
            if (addresses.size() > 0) 
            {
                for (int i=0; i<addresses.get(0).getMaxAddressLineIndex();i++)
                    add += addresses.get(0).getAddressLine(i) + "
";
            }

            Toast.makeText(getBaseContext(), add, Toast.LENGTH_LONG).show();
        }
        catch (IOException e) {                
            e.printStackTrace();
        }   
        return true;
    }
    else                
        return false;
}             

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gps_main);

    mapView = (MapView) findViewById(R.id.mapView); 
    LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);  
    View zoomView = mapView.getZoomControls(); 

    zoomLayout.addView(zoomView, 
            new LinearLayout.LayoutParams(
                    LayoutParams.WRAP_CONTENT, 
                    LayoutParams.WRAP_CONTENT)); 
    mapView.displayZoomControls(true);

    mc = mapView.getController();

    Geocoder geocoder = new Geocoder(this, Locale.getDefault());
    List<Address> addresses = null;
    try {   

        addresses = geocoder.getFromLocationName(getIntent().getStringExtra("address"), 1);

    } catch (IOException e) { 
        e.printStackTrace();
    }

    try{ 
        address = addresses.get(0);  
    }
    catch (Exception e) {
        flash("Unable to locate given address");
        startActivity(new Intent(this, GPSMainActivity.class));
        finish();
    }
    try{
        //stores the Longitude n lattitude in log file
        lng  = address.getLongitude();  
        lat  = address.getLatitude();   

        //for writing into log.text
        HomeActivity.writeLog(getIntent().getStringExtra("address") +" GPS co-ordibnates : "+lat+" , "+lng);

    }catch (Exception e) { 
        e.printStackTrace();
    } 
    p = new GeoPoint(
            (int) (lat * 1E6), 
            (int) (lng * 1E6));

    mc.animateTo(p);
    mc.setZoom(17); 

    //---Add a location marker---
    MapOverlay mapOverlay = new MapOverlay();
    List<Overlay> listOfOverlays = mapView.getOverlays();
    listOfOverlays.clear();
    listOfOverlays.add(mapOverlay);        

    mapView.invalidate();

    //mapView.invalidate();      
}   

//ScreenShot of Image
private void screenshot() {
    try{
        String mapDIR = HomeActivity.DIRECTORY+"/Image";

        File f = new File(mapDIR);

        if(! f.exists())
        {
            f.mkdir();
        }

        MapView v1 = (MapView)findViewById(R.id.mapView);
        v1.setDrawingCacheEnabled(true);

        Bitmap b = Bitmap.createBitmap(v1.getDrawingCache());

        try
        {
            FileOutputStream fos = new FileOutputStream(mapDIR+"/"+System.currentTimeMillis()+".png");
            b.compress(CompressFormat.PNG, 50, fos);
            fos.close();

        } catch (FileNotFoundException e) {
            Toast.makeText(getApplicationContext(), e.getMessage(),Toast.LENGTH_LONG).show();
            e.printStackTrace();
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), e.getMessage(),Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }
        v1.setDrawingCacheEnabled(false); // clear drawing cache
    }catch (Exception e) {
        Toast.makeText(getApplicationContext(), e.getMessage(),Toast.LENGTH_LONG).show();
        e.printStackTrace();
    }

}

private void flash(String data) {   
    Toast.makeText(getApplicationContext(), data, Toast.LENGTH_LONG).show();
}

@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub    
    return false;
}

public boolean onKeyDown(int keyCode, KeyEvent event) 
{
    if(keyCode == KeyEvent.KEYCODE_BACK)
    {
        startActivity(new Intent(this, GPSMainActivity.class));
        finish();
    } 
    return super.onKeyDown(keyCode, event);
}     
//menu button
@Override
public boolean onCreateOptionsMenu(android.view.Menu menu) 
{
    super.onCreateOptionsMenu(menu);

    menu.add(0, 1, 0 , "Exit");
    menu.add(0, 2, 0 , "Capture Image");



    return true;
} 

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item)
{
    switch(item.getItemId()) 
    {
    case 1: 
        startActivity(new Intent(this, GPSMainActivity.class));
        finish();
        break; 
    case 2: 
        screenshot();
        Toast.makeText(getApplicationContext(), "Captured Map", Toast.LENGTH_SHORT).show();
        break; 
    }
    return super.onMenuItemSelected(featureId, item);
}
}

Thanks for All.. Hope this will help some one..

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