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我正在使用Google地圖查找提供的地址上的位置。Android：如何捕捉GPS位置的圖像
我想存儲從Google Maps onClick獲得的位置圖像。
有誰知道如何做到這一點？
這裏是我的谷歌地圖&存儲的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) + "\n";
}
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);
}
}
我收到此錯誤
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
我對這個perticular碼得到錯誤
// 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));
請幫忙碼我出來..提前致謝
取當前視圖 – 2012-03-28 10:24:26
截圖@imrankhan我試圖採取特定的看法，但無法截圖..請查看我的代碼..我用代碼更新了問題..提前謝謝 – 2012-03-28 11:32:54
NullPointer在哪一行？ – Ferdau 2012-03-28 11:50:38