startActivityForResult返回数据null

1 回答

• 0

  Full Demo working on all versions.

  对于捕获和拾取图像

  注意：Android 6.0在点击后获得运行时权限然后获得 .

  public class MainActivity extends Activity {
  
      private ImageView camera, gallery;
      File photoFile;
      Uri uri;
      private final static int RESULT_LOAD_IMAGE = 1;
      private final static int REQUEST_IMAGE_CAPTURE = 2;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          camera = (ImageView) findViewById(R.id.Img);
          gallery = (ImageView) findViewById(R.id.imageView);
          camera.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  dispatchTakePictureIntent();
  
              }
          });
          gallery.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                  startActivityForResult(i, RESULT_LOAD_IMAGE);
              }
          });
      }
  
      private void dispatchTakePictureIntent() {
  
          Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
              photoFile = Environment.getExternalStoragePublicDirectory("/myimage/save.jpg");
              if (photoFile != null) {
                  takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                          Uri.fromFile(photoFile));
                  startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
              }
          }
      }
  
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
              uri = data.getData();
              String selecteadImage = getRealPathFromURI(this, data.getData());
              Toast.makeText(this, "Image path " + selecteadImage, Toast.LENGTH_LONG).show();
  
          } else if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
  
              if (data != null && data.getData() != null) {
                  String selecteadImage = getRealPathFromURI(this, data.getData());
                  Toast.makeText(this, "Image path " + selecteadImage, Toast.LENGTH_LONG).show();
              } else {
                  if (photoFile != null) {
                      String selecteadImage = photoFile.getAbsolutePath();
                      Toast.makeText(this, "Image path " + selecteadImage, Toast.LENGTH_LONG).show();
                  }
              }
          }
      }
  
      public String getRealPathFromURI(Context context, Uri contentUri) {
          Cursor cursor = null;
          try {
              String[] proj = {MediaStore.Images.Media.DATA};
              cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
              int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
              cursor.moveToFirst();
              return cursor.getString(column_index);
          } finally {
              if (cursor != null) {
                  cursor.close();
              }
          }
      }
  }
  

  Manifest Permissions:

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
      <uses-permission android:name="android.permission.CAMERA" />
      <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
  

  activity_main:

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:background="@drawable/image_1">
  
  
      <ImageView
          android:id="@+id/camera"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerHorizontal="true"
          android:layout_centerVertical="true"
          android:src="@mipmap/ic_launcher" />
  
      <ImageView
          android:id="@+id/gallery"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_below="@+id/camera"
          android:layout_centerHorizontal="true"
          android:src="@mipmap/ic_launcher" />
  </RelativeLayout>
  

  回复于 2024-05-07T01:36:12+08:00