android：从图库中选择图像，然后裁剪并显示在图像视图中

Posted 2023-02-25

【中文标题】android：从图库中选择图像，然后裁剪并显示在图像视图中

【英文标题】：android:select image from gallery then crop that and show in an imageview

【发布时间】：2014-08-25 17:09:27

【问题描述】：

我真的需要这个代码，我在网上搜索了 3 个小时，但我找不到完整而简单的代码，我测试了很多代码，但有些不起作用，有些不好，请帮助我完整而简单的代码，谢谢 编辑：我有这个选择图像的代码，但请给我一个完整的代码，因为我不能像代码一样。

  btn_choose.setOnClickListener(new View.OnClickListener() 

            public void onClick(View v) 
                // TODO Auto-generated method stub
                   Intent intent = new Intent();
                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);
       startActivityForResult(Intent.createChooser(intent,"Select Picture"),SELECT_PICTURE);


            alertDialog1.dismiss();

            
        );
  protected void onActivityResult(int requestCode, int resultCode, Intent data) 

       if (resultCode == RESULT_OK) 

   if (requestCode == SELECT_PICTURE) 
                        Uri selectedImageUri = data.getData();
                        selectedImagePath = getPath(selectedImageUri);
                        selectedImagePath1=selectedImagePath;
                        System.out.println("Image Path : " + selectedImagePath);
                        image_capture1.setImageURI(selectedImageUri);
                    

【参考方案1】：

希望本准则对您有所帮助..

从图库中选择图像的活动。

import java.io.File;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;

public class GalleryUtil extends Activity
    private final static int RESULT_SELECT_IMAGE = 100;
    public static final int MEDIA_TYPE_IMAGE = 1;
    private static final String TAG = "GalleryUtil";

    String mCurrentPhotoPath;
    File photoFile = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        try
            //Pick Image From Gallery
            Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i, RESULT_SELECT_IMAGE); 
        catch(Exception e)
            e.printStackTrace();
        
    

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
        super.onActivityResult(requestCode, resultCode, data);

        switch(requestCode)
        case RESULT_SELECT_IMAGE:

            if (resultCode == Activity.RESULT_OK && data != null && data.getData() != null) 
                try
                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();

                //return Image Path to the Main Activity
                Intent returnFromGalleryIntent = new Intent();
                returnFromGalleryIntent.putExtra("picturePath",picturePath);
                setResult(RESULT_OK,returnFromGalleryIntent);     
                finish();
                catch(Exception e)
                    e.printStackTrace();
                    Intent returnFromGalleryIntent = new Intent();
                    setResult(RESULT_CANCELED, returnFromGalleryIntent);     
                    finish();   
                
            else
                Log.i(TAG,"RESULT_CANCELED");     
                Intent returnFromGalleryIntent = new Intent();
                setResult(RESULT_CANCELED, returnFromGalleryIntent);     
                finish();
            
            break;
        
    

裁剪所选图像的活动：

public class ImageSelecter extends Activity

    private final int GALLERY_ACTIVITY_CODE=200;
    private final int RESULT_CROP = 400;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);

        btn_choose.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v) 
                //Start Activity To Select Image From Gallery   
                Intent gallery_Intent = new Intent(getApplicationContext(), GalleryUtil.class);
                startActivityForResult(gallery_Intent, GALLERY_ACTIVITY_CODE);
            
        );

    

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) 
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == GALLERY_ACTIVITY_CODE) 
             if(resultCode == Activity.RESULT_OK)  
                 picturePath = data.getStringExtra("picturePath");  
                 //perform Crop on the Image Selected from Gallery
                 performCrop(picturePath);
             
        

        if (requestCode == RESULT_CROP ) 
             if(resultCode == Activity.RESULT_OK)  
                 Bundle extras = data.getExtras();
                 Bitmap selectedBitmap = extras.getParcelable("data");
                 // Set The Bitmap Data To ImageView
                 image_capture1.setImageBitmap(selectedBitmap);                             
                 image_capture1.setScaleType(ScaleType.FIT_XY);
             
        
    

    private void performCrop(String picUri) 
        try 
            //Start Crop Activity

            Intent cropIntent = new Intent("com.android.camera.action.CROP");
            // indicate image type and Uri
            File f = new File(picUri);
            Uri contentUri = Uri.fromFile(f);

            cropIntent.setDataAndType(contentUri, "image/*");
            // set crop properties
            cropIntent.putExtra("crop", "true");
            // indicate aspect of desired crop
            cropIntent.putExtra("aspectX", 1);
            cropIntent.putExtra("aspectY", 1);
            // indicate output X and Y
            cropIntent.putExtra("outputX", 280);
            cropIntent.putExtra("outputY", 280);

            // retrieve data on return
            cropIntent.putExtra("return-data", true);
            // start the activity - we handle returning in onActivityResult
            startActivityForResult(cropIntent, RESULT_CROP);
        
        // respond to users whose devices do not support the crop action
        catch (ActivityNotFoundException anfe) 
            // display an error message
            String errorMessage = "your device doesn't support the crop action!";
            Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
            toast.show();
        
       

编辑： 签出此开源库以从图库中选择图像或使用相机捕获新图像。它将节省大量样板代码。 https://github.com/Dhaval2404/ImagePicker

【讨论】：

如果您得到解决方案，请接受答案。

感谢分享。但是，我必须注意 both 这些活动必须在清单中具有 android:launchMode="singleTop" 和 android:noHistory="false" 属性。否则它不起作用，onActivityResult 会被RESULT_CANCELED 调用。我花了好几个小时才弄明白。

另外，我们不需要为图像选择和裁剪设置单独的活动。它可以在一个活动中完成。

是的 @Atul 是正确的，不需要 2 个单独的活动。

我在 Bundle extras = data.getExtras(); 处遇到空指针异常。 extras 变量为空。

【参考方案2】：

我在这里发布工作代码：

private static final int PICK_FROM_GALLERY = 2;

buttonGallery.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            Intent intent = new Intent();
      //******call android default gallery
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
      //******code for crop image
            intent.putExtra("crop", "true");
            intent.putExtra("aspectX", 0);
            intent.putExtra("aspectY", 0);
            try 
               intent.putExtra("return-data", true);
               startActivityForResult(
                  Intent.createChooser(intent,"Complete action using"),
                  PICK_FROM_GALLERY);
             catch (ActivityNotFoundException e) 
        
    );

在onActivityResult内

if (requestCode == PICK_FROM_GALLERY) 
    Bundle extras2 = data.getExtras();
    if (extras2 != null) 
            Bitmap photo = extras2.getParcelable("data");
            imgview.setImageBitmap(photo);
    

请试试这个。

【讨论】：

非常适合我。唯一的问题是图像分辨率非常低。有什么办法解决这个问题？

完成操作使用什么？

@siddhartha shankar，这种方法需要存储权限吗

【参考方案3】：

我有一点不同的方法

我使用external library 管理我的下载 库会在后台加载它

此设置允许具有大量项目和快速滚动的列表具有良好的性能:)

DisplayImageOptions options=new DisplayImageOptions.Builder()                       .cacheOnDisk(true)
        .imageScaleType(ImageScaleType.EXACTLY)
        .considerExifParams(true)
        .bitmapConfig(Bitmap.Config.RGB_565)
        .imageScaleType(ImageScaleType.EXACTLY)     
        .build();

ImageLoader.getInstance().displayImage(url, imageView, options);