如何从GridView中的应用程序内存中加载图像

我使用此tutorial从图库加载图像并使用CheckBox在网格中显示。我想更改此代码以从/data/data/com.myexample.myfiles/files/加载图像我该如何实现它？请帮帮我。如何从GridView中的应用程序内存中加载图像

import android.app.Activity; 

public class AndroidCustomGalleryActivity extends Activity { 

private int count; 
private Bitmap[] thumbnails; 
private boolean[] thumbnailsselection; 
private String[] arrPath; 
private ImageAdapter imageAdapter; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    final String[] columns = { MediaStore.Images.Media.DATA, 
    MediaStore.Images.Media._ID }; 
    final String orderBy = MediaStore.Images.Media._ID; 
    Cursor imagecursor = managedQuery(
      MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, 
      null, orderBy); 
    int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID); 
    this.count = imagecursor.getCount(); 
    this.thumbnails = new Bitmap[this.count]; 
    this.arrPath = new String[this.count]; 
    this.thumbnailsselection = new boolean[this.count]; 
    for (int i = 0; i < this.count; i++) { 
     imagecursor.moveToPosition(i); 
     int id = imagecursor.getInt(image_column_index); 
     int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA); 
     thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
       getApplicationContext().getContentResolver(), id, 
       MediaStore.Images.Thumbnails.MICRO_KIND, null); 
     arrPath[i]= imagecursor.getString(dataColumnIndex); 
    } 
    GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid); 
    imageAdapter = new ImageAdapter(); 
    imagegrid.setAdapter(imageAdapter); 
    imagecursor.close(); 

    final Button selectBtn = (Button) findViewById(R.id.selectBtn); 
    selectBtn.setOnClickListener(new OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      final int len = thumbnailsselection.length; 
      int cnt = 0; 
      String selectImages = ""; 
      for (int i =0; i<len; i++) 
      { 
       if (thumbnailsselection[i]){ 
        cnt++; 
        selectImages = selectImages + arrPath[i] + "|"; 
       } 
      } 
      if (cnt == 0){ 
       Toast.makeText(getApplicationContext(), 
         "Please select at least one image", 
         Toast.LENGTH_LONG).show(); 
      } else { 
       Toast.makeText(getApplicationContext(), 
         "You've selected Total " + cnt + " image(s).", 
         Toast.LENGTH_LONG).show(); 
       Log.d("SelectedImages", selectImages); 
      } 
     } 
    }); 
} 

public class ImageAdapter extends BaseAdapter { 
    private LayoutInflater mInflater; 

    public ImageAdapter() { 
     mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    public int getCount() { 
     return count; 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     ViewHolder holder; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
      convertView = mInflater.inflate(
        R.layout.galleryitem, null); 
      holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage); 
      holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox); 

      convertView.setTag(holder); 
     } 
     else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 
     holder.checkbox.setId(position); 
     holder.imageview.setId(position); 
     holder.checkbox.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       CheckBox cb = (CheckBox) v; 
       int id = cb.getId(); 
       if (thumbnailsselection[id]){ 
        cb.setChecked(false); 
        thumbnailsselection[id] = false; 
       } else { 
        cb.setChecked(true); 
        thumbnailsselection[id] = true; 
       } 
      } 
     }); 
     holder.imageview.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       int id = v.getId(); 
       Intent intent = new Intent(); 
       intent.setAction(Intent.ACTION_VIEW); 
       intent.setDataAndType(Uri.parse("file://" + arrPath[id]), "image/*"); 
       startActivity(intent); 
      } 
     }); 
     holder.imageview.setImageBitmap(thumbnails[position]); 
     holder.checkbox.setChecked(thumbnailsselection[position]); 
     holder.id = position; 
     return convertView; 
    } 
} 
class ViewHolder { 
    ImageView imageview; 
    CheckBox checkbox; 
    int id; 
} 
}

来源

2013-04-21 Hayya Anam

继承人可用于从任何SD卡文件夹加载图像的完整代码。我已使用UniversalImageLoader库进行图像加载。

公共类GalleryScreenActivity延伸SherlockActivity {

private DisplayImageOptions options; 
private ImageAdapter imageAdapter; 
private GridView gridView; 
protected ImageLoader imageLoader = ImageLoader.getInstance(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    setTheme(R.style.Theme_Custom); 
    super.onCreate(savedInstanceState); 

    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    getSupportActionBar().setDisplayShowTitleEnabled(false); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 


    setContentView(R.layout.activity_gallery_screen); 

    options = new DisplayImageOptions.Builder() 
     .showImageForEmptyUri(R.drawable.image_for_empty_url) 
     .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) 
     .bitmapConfig(Bitmap.Config.RGB_565) 
     .build(); 

    gridView = (GridView) findViewById(R.id.gridview); 

    imageAdapter = new ImageAdapter(); 

    gridView.setAdapter(imageAdapter); 
    gridView.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      startImageGalleryActivity(position); 
     } 
    }); 
    gridView.setOnScrollListener(new PauseOnScrollListener(true, true)); 
} 

@Override 
protected void onStart() { 
    // TODO Auto-generated method stub 
    super.onStart(); 
    if(Data.array == null){ 
     getImageStrings(); 
     imageAdapter.notifyDataSetChanged(); 
    } 
    gridView.setVisibility(View.VISIBLE); 
    if(Data.array.size() == 0) 
     gridView.setVisibility(View.INVISIBLE); 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume();  
} 

public void getImageStrings(){ 
    File sdDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),Constants.PICTURE_SAVE_FOLDER); 

    // This location works best if you want the created images to be shared 
    // between applications and persist after your app has been uninstalled. 
    // Create the storage directory if it does not exist 
    if (!sdDir.exists()) { 
     if (!sdDir.mkdirs()) { 
      Log.d(TAG, "failed to create directory"); 
      Toast.makeText(getApplicationContext(), "SD CARD ERROR: FIX IT AND TRY AGAIN", Toast.LENGTH_LONG).show(); 
     }else{ 

     } 
    } 

    File[] sdDirFiles = sdDir.listFiles(new FilenameFilter() { 

     @Override 
     public boolean accept(File dir, String filename) { 
      return filename.contains(".jpg") || filename.contains(".png"); 
     } 
    }); 

    String tempUrl; 

    if(Data.array == null) 
     Data.array = new LinkedList<String>(); 

    if(sdDirFiles != null) 
     for(File singleFile : sdDirFiles) 
     { 
      tempUrl = singleFile.getAbsolutePath(); 
      Log.d("FILE", "file://"+tempUrl); 
      Data.array.add("file://"+tempUrl); 
     } 
} 

private void startImageGalleryActivity(int position) { 
    Intent intent = new Intent(this, GalleryDetailScreenActivity.class); 
    Data.galleryDetailPosition = position; 
    startActivity(intent); 
    overridePendingTransition(R.anim.appear_right, R.anim.hide_left); 
    finish(); 
} 

@Override 
protected void onStop() { 
    // TODO Auto-generated method stub 
    super.onStop(); 
} 

@Override 
public void onBackPressed() { 
    // TODO Auto-generated method stub 
    super.onBackPressed(); 
    Data.resetData(); 
    overridePendingTransition(R.anim.appear_left, R.anim.hide_right); 
} 

@Override 
protected void onDestroy() { 
    // TODO Auto-generated method stub 
    super.onDestroy(); 
} 

@Override 
public boolean onMenuItemSelected(int featureId, MenuItem item) { 
    // TODO Auto-generated method stub 
    switch (item.getItemId()) { 
    case android.R.id.home: 
     finish(); 
     overridePendingTransition(R.anim.appear_left, R.anim.hide_right); 
     break; 
    } 

    return true; 
} 

public class ImageAdapter extends BaseAdapter { 

    @Override 
    public int getCount() { 
     if(Data.array == null) 
      return 0; 
     return Data.array.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     final FrameLayout imageLayout; 
     if(convertView == null) 
      imageLayout = (FrameLayout) getLayoutInflater().inflate(R.layout.activity_gallery_screen_item, null); 
     else 
      imageLayout = (FrameLayout) convertView; 

     final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image); 
     imageView.setImageBitmap(null); 
     final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading); 

     imageLoader.displayImage(Data.array.get(position), imageView, options, new SimpleImageLoadingListener() { 

      @Override 
      public void onLoadingStarted() { 
       spinner.setVisibility(View.VISIBLE); 
      } 

      @Override 
      public void onLoadingFailed(FailReason failReason) { 
       String message = null; 
       switch (failReason) { 
        case IO_ERROR: 
         message = "Input/Output error"; 
         break; 
        case OUT_OF_MEMORY: 
         message = "Out Of Memory error"; 
         break; 
        case UNKNOWN: 
         message = "Unknown error"; 
         break; 
       } 
       Toast.makeText(GalleryScreenActivity.this, message, Toast.LENGTH_SHORT).show(); 

       spinner.setVisibility(View.GONE); 
       imageView.setImageResource(android.R.drawable.ic_delete); 
      } 

      @Override 
      public void onLoadingComplete(Bitmap loadedImage) { 
       spinner.setVisibility(View.GONE); 
      } 
     }); 
     return imageLayout; 
    } 
}

}

来源

2013-05-01 10:00:57

`文件yourDir =新的文件（ “数据/数据/ com.myexample.myfiles /文件/”）;

yourDir.mkdir(); 
enter code here 
    ArrayList<GalleryHelper> dataT = null; 

    dataT = new ArrayList<GalleryHelper>(); 

    for (File f : yourDir.listFiles()) { 
     if (f.isFile()) { 
      imageLoader.displayImage("data/data/com.myexample.myfiles/files" + f.getName(), imgSinglePick); 



      GalleryHelper item = new GalleryHelper(); 
      item.sdcardPath = "data/data/com.myexample.myfiles/files" + f.getName(); 

      dataT.add(item); 
     } 
    } 
    imgAdapter.addAll(dataT);

和我的画廊辅助类是：

公共类GalleryHelper {

public String sdcardPath; 
    public File file; 
    public boolean isSeleted = false;

}

来源

2015-01-17 12:56:09

如何从GridView中的应用程序内存中加载图像

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