Question

我正在尝试保存我的onMapClick意图（用户点击地图上放置标记的点，但是在我的应用程序中我首先拍照然后返回）但是它似乎在Activity上为结果破坏或“忘记”如果您要重新生成图片，那么我正在尝试实施onSaveInstanceState和onRestoreInstanceState。但这似乎不起作用。

这是我到目前为止的代码：

private static Uri fileUri;
  private static final int TAKE_PICTURE = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_googlemaps);
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  savedInstanceState.putInt("TAKE_PICTURE", 1);
  // etc.
}   
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
          super.onRestoreInstanceState(savedInstanceState);
          savedInstanceState.getInt("resultCode", 1);


    try {
        // Loading map
        initilizeMap();

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

和

 public void onMapLongClick(LatLng point) {
        root = Environment.getExternalStorageDirectory().toString()
           + "/Your_Folder";
           imageFolderPath = root + "/saved_images";
           File imagesFolder = new File(imageFolderPath);
           imagesFolder.mkdirs();
          imageName = "test.png";
          File image = new File(imageFolderPath, imageName);

          fileUri = Uri.fromFile(image);
          Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

          takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

          startActivityForResult(takePictureIntent,
                  TAKE_PICTURE);
  }

       public void onActivityResult(int requestCode, int resultCode, Intent data,  LatLng point) {
          if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {

                  try {
                      GetImageThumbnail getImageThumbnail = new GetImageThumbnail();
                      bitmap = getImageThumbnail.getThumbnail(fileUri, this);
                  } catch (FileNotFoundException e1) {
                      e1.printStackTrace();
                  } catch (IOException e1) {
                      e1.printStackTrace();
                  }

                  MarkerOptions markerOptions = new MarkerOptions()
                  .position(point)
                  .icon(BitmapDescriptorFactory
                  .fromBitmap(bitmap));
                  googleMap.addMarker(markerOptions);
          }
          }





         public void showFullImage(View view) {
            String path = (String) view.getTag();

            if (path != null) {

                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_VIEW);
                Uri imgUri = Uri.parse("file://" + path);
                intent.setDataAndType(imgUri, "image/*");
                startActivity(intent);
            }

            }

我这样做错了吗？请帮忙

完整代码

public class Test extends Activity implements OnMapLongClickListener, OnMapClickListener{


private GoogleMap googleMap;
static final LatLng Location = new LatLng(xx.xxxx, xx.xxxx);

private static double latitude;
private static double longitude;
static final LatLng point = new LatLng(latitude /1E6, longitude /1E6);
MarkerOptions markerOptions;

  Bitmap bitmap;
  private String root;
  private String imageFolderPath;        
  private String imageName;

  private static Uri fileUri;
  private static final int TAKE_PICTURE = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_googlemaps);
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  savedInstanceState.putInt("TAKE_PICTURE", 1);
  // etc.
}   
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
          super.onRestoreInstanceState(savedInstanceState);
          savedInstanceState.getInt("resultCode", 1);


    try {
        // Loading map
        initilizeMap();

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

/**
 * function to load map. If map is not created it will create it for you
 * */
private void initilizeMap() {
    if (googleMap == null) {
        googleMap = ((MapFragment)  getFragmentManager().findFragmentById(R.id.map)).getMap();

        // check if map is created successfully or not
        if (googleMap == null) {
            Toast.makeText(getApplicationContext(),
                    "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                    .show();
        }
    }
 }


 @Override
   public void onResume() {
    super.onResume();
    initilizeMap();

    if (googleMap!=null){
        googleMap.addMarker(new MarkerOptions().position(Location)
            .title("Location 1")
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.campmarker)));

      }


 CameraPosition cameraPosition = new CameraPosition.Builder().target(
         new LatLng(xx.xxxx, xx.xxxx)).zoom(8).bearing(0).tilt(80).build();

 googleMap.setOnMapClickListener(this);
 googleMap.setOnMapLongClickListener(this);
 googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

 // adding marker

 googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
 googleMap.setMyLocationEnabled(true); // false to disable
 googleMap.getUiSettings().setZoomControlsEnabled(false); // true to enable
 googleMap.getUiSettings().setCompassEnabled(true);
 googleMap.getUiSettings().setMyLocationButtonEnabled(true); 
}

  public void onMapLongClick(LatLng point) {
        root = Environment.getExternalStorageDirectory().toString()
           + "/My Folder";
           imageFolderPath = root + "/saved_images";
           File imagesFolder = new File(imageFolderPath);
           imagesFolder.mkdirs();
          imageName = "test.png";
          File image = new File(imageFolderPath, imageName);

          fileUri = Uri.fromFile(image);
          Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

          takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

          startActivityForResult(takePictureIntent,
                  TAKE_PICTURE);
  }

       public void onActivityResult(int requestCode, int resultCode, Intent data, LatLng point) {
          if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {

                  try {
                      GetImageThumbnail getImageThumbnail = new GetImageThumbnail();
                      bitmap = getImageThumbnail.getThumbnail(fileUri, this);
                  } catch (FileNotFoundException e1) {
                      e1.printStackTrace();
                  } catch (IOException e1) {
                      e1.printStackTrace();
                  }

                  MarkerOptions markerOptions = new MarkerOptions()
                  .position(point)
                  .icon(BitmapDescriptorFactory
                  .fromBitmap(bitmap));
                  googleMap.addMarker(markerOptions);
          }
          }





         public void showFullImage(View view) {
            String path = (String) view.getTag();

            if (path != null) {

                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_VIEW);
                Uri imgUri = Uri.parse("file://" + path);
                intent.setDataAndType(imgUri, "image/*");
                startActivity(intent);
            }

            }

Answer 1

问题和评论很难解释。我将假设所有这些都归结为：

我如何抓住传递到LatLng的{{1}}，因为拍照导致我的进程被终止并重新启动？

首先，将onMapLongClick()数据成员添加到您的活动中。出于本答案的目的，我将其称之为：

LatLng

在LatLng theLastPlaceThatTheUserLongClicked;中，作为第一行，保存传递到onMapLongClick()的{{1}}：

LatLng

在班级中创建另一个常量：

onMapLongClick()

将现有的theLastPlaceThatTheUserLongClicked=point;和private static final String EXTRA_PLACE="theLastPlaceThatTheUserLongClicked";替换为：

onSaveInstanceState()

然后，当您需要用户长按的最后一个位置时，请使用onRestoreInstanceState()。

如何保存onMapClick意图并在活动返回后恢复

1 个答案: