Android中的文本文件的視圖像ImageView中的圖像android

Question

我想製作一個應用程序，在網格視圖中顯示像docs，pdf，txt等文本文件，就像ImageView顯示圖像一樣。是否存在這些文件的任何視圖在android中。 代碼如下，在這我能夠查看圖像在網格中但不是文檔文件。

public class MainActivity extends Activity implements OnItemClickListener{ 

public class ImageAdapter extends BaseAdapter { 

private Context mContext; 
ArrayList<String> itemList = new ArrayList<String>(); 

public ImageAdapter(Context c) { 
    mContext = c; 
} 

void add(String path){ 
    itemList.add(path); 
} 

    @Override 
    public int getCount() { 
    return itemList.size(); 
} 

@Override 
public Object getItem(int arg0) { 
// TODO Auto-generated method stub 
return null; 
} 

@Override 
public long getItemId(int position) { 
// TODO Auto-generated method stub 
return 0; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    ImageView imageView; 
    if (convertView == null) { // if it's not recycled, initialize some attributes 
     imageView = new ImageView(mContext); 
     imageView.setLayoutParams(new GridView.LayoutParams(70, 70)); 
     imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
     imageView.setPadding(3, 3, 3, 3); 
    } else { 
     imageView = (ImageView) convertView; 
    } 

    Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 100, 100); 

    imageView.setImageBitmap(bm); 
    return imageView; 
} 

public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) { 

    Bitmap bm = null; 
// First decode with inJustDecodeBounds=true to check dimensions 
final BitmapFactory.Options options = new BitmapFactory.Options(); 
options.inJustDecodeBounds = true; 
BitmapFactory.decodeFile(path, options); 

// Calculate inSampleSize 
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 

// Decode bitmap with inSampleSize set 
options.inJustDecodeBounds = false; 
bm = BitmapFactory.decodeFile(path, options); 

return bm; 
} 

public int calculateInSampleSize(

BitmapFactory.Options options, int reqWidth, int reqHeight) { 
// Raw height and width of image 
final int height = options.outHeight; 
final int width = options.outWidth; 
int inSampleSize = 1; 

if (height > reqHeight || width > reqWidth) { 
    if (width > height) { 
    inSampleSize = Math.round((float)height/(float)reqHeight);  
} else { 
    inSampleSize = Math.round((float)width/(float)reqWidth);  
} 
} 

return inSampleSize;  
} 

} 

ImageAdapter myImageAdapter; 

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

    GridView gridview = (GridView) findViewById(R.id.gridview); 
    myImageAdapter = new ImageAdapter(this); 
    gridview.setAdapter(myImageAdapter); 
    gridview.setOnItemClickListener(this); 
    String ExternalStorageDirectoryPath = Environment 
     .getExternalStorageDirectory() 
     .getAbsolutePath(); 

    String targetPath = ExternalStorageDirectoryPath + "/img/"; 

    Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show(); 
    File targetDirector = new File(targetPath); 

    File[] files = targetDirector.listFiles(); 
    for (File file : files){ 
    myImageAdapter.add(file.getAbsolutePath()); 


    } 
    } 

    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 

} 

} 

Answer 1

使用這樣的：

     if(filetype.toString().equals(".pdf")) 
         { 
           //place your pdf image 
          imageview= (ImageView)findViewById(R.id.imageView); 
          Drawable res = getResources().getDrawable(imageResource); 
          imageView.setImageDrawable(res); 
         } 

         else if(filetype.toString().equals(".docs")) 
         { 
          //place your docs image 
          imageview= (ImageView)findViewById(R.id.imageView); 
          Drawable res = getResources().getDrawable(imageResource); 
          imageView.setImageDrawable(res); 
         } 

         else if(filetype.toString().equals(".txt ")) 
         { 
          //place your txt image 
          imageview= (ImageView)findViewById(R.id.imageView); 
          Drawable res = getResources().getDrawable(imageResource); 
          imageView.setImageDrawable(res); 
         } 

How to set the image from drawable dynamically in android?。希望這會幫助你