Question

我是android开发的初学者。我正在努力开发自己的画廊。但我遇到了一个问题。当我在我的记忆中找到SD卡并选择照片时，我正在尝试使用我的图像查看器应用程序打开图像。但是当我选择图像查看器时，会调用另一个意图来选择我的图像。但我直接希望在Imageview上显示所选图像。请有人帮助我。

我的代码：

public class MainActivity extends Activity {

     private static final int REQUEST_CODE = 1;
      private Bitmap bitmap;
      private ImageView imageView;
      private String selectedImagePath;


      @Override
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.result);
        pickImage();
      }

      public void pickImage() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent, REQUEST_CODE);
      }

      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        InputStream stream = null;


        if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK)
          try {
            // recyle unused bitmaps

                    Uri selectedImage = data.getData();



                    String[] filePathColumn = {MediaStore.Images.Media.DATA};
                    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                    cursor.moveToFirst();
                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    String filePath = cursor.getString(columnIndex);

                    Log.v("roni", filePath);
                    cursor.close();

                    if(bitmap != null && !bitmap.isRecycled())
                    {
                        bitmap = null;                
                    }

                    bitmap = BitmapFactory.decodeFile(filePath);
                    imageView.setBackgroundResource(0);
                    imageView.setImageBitmap(bitmap);              


           // imageView.setImageBitmap(bitmap);
          } catch (Exception e) {
            e.printStackTrace();
          } finally {
            if (stream != null)
              try {
                stream.close();
              } catch (IOException e) {
                e.printStackTrace();
              }
          }
      }
      private String getPath(Uri uri)
      {    
      String[] projection={MediaStore.Images.Media.DATA}; 
      Cursor cursor=managedQuery(uri,projection,null,null,null);
      int column_index=cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
      cursor.moveToFirst(); 
      return cursor.getString(column_index); 
  }  
}

/////更改代码后

public class MainActivity extends Activity {

 private static final int REQUEST_CODE = 1;
  private Bitmap bitmap;
  private ImageView imageView;
  private String selectedImagePath;


  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView = (ImageView) findViewById(R.id.result);

    Intent i = new Intent(
            Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

    startActivityForResult(i, REQUEST_CODE);


  }



  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    InputStream stream = null;


    if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK)
      try {
        // recyle unused bitmaps

                Uri selectedImage = data.getData();



                String[] filePathColumn = {MediaStore.Images.Media.DATA};
                Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                cursor.moveToFirst();
                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                String filePath = cursor.getString(columnIndex);

                Log.v("roni", filePath);
                cursor.close();

                if(bitmap != null && !bitmap.isRecycled())
                {
                    bitmap = null;                
                }

                bitmap = BitmapFactory.decodeFile(filePath);
                //imageView.setBackgroundResource(0);
                imageView.setImageBitmap(bitmap);              


       // imageView.setImageBitmap(bitmap);
      } catch (Exception e) {
        e.printStackTrace();
      } finally {
        if (stream != null)
          try {
            stream.close();
          } catch (IOException e) {
            e.printStackTrace();
          }
      }
  }


  private String getPath(Uri uri)
  {    
  String[] projection={MediaStore.Images.Media.DATA}; 
  Cursor cursor=managedQuery(uri,projection,null,null,null);
  int column_index=cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
  cursor.moveToFirst(); 
  return cursor.getString(column_index); }  }

Answer 1

假设您有一个名为ViewActivity的活动，该活动会显示所选的图片。

在AndroidManifest.xml中将您的活动设置为图像查看器活动，方法是添加：

<activity android:name=".ViewActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <data android:mimeType="image/*"/>
    </intent-filter>
</activity>

在onCreate() ViewActivity方法的Intent intent = getIntent(); Uri data = intent.getData(); //Check If data type is Image if (intent.getType().indexOf("image/") != -1) { myImageView.setImageURI(data); }方法中通过执行此操作传递了Image：

{{1}}

Answer 2

尝试此代码替换全班plz如果成功，那么我将向您解释

public class ImageGalleryDemoActivity extends Activity {


    private static int RESULT_LOAD_IMAGE = 1;


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

        Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
        buttonLoadImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Intent i = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);
            }
        });
    }


    @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 selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.imgView);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        }


    }
}

如何在Android中的imageview上从SD卡设置所选图像

2 个答案: