保存视图到图像 - 位置或不工作

Question

我试图将我的视图保存为图像。我做了一些工作，没有显示任何错误，但我可以找到保存图像的位置（或在图库中）。完全是根据图像创建的，还是我有其他一些问题？该图像应保存按从选项菜单红色时：

case R.id.red: 
       DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); 
       Date date = new Date(); 
       String FILENAME="Boenka"; 
       FileOutputStream fos = null; 
       try { 
        fos = openFileOutput(FILENAME, Context.MODE_WORLD_READABLE); 
       } catch (FileNotFoundException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
       parent.setDrawingCacheEnabled(true); 
       Bitmap bitmap = Bitmap.createBitmap(parent.getWidth(), parent.getHeight(), Bitmap.Config.ARGB_8888); 
       Canvas canvas = new Canvas(bitmap); 
       parent.draw(canvas); 
       bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos); 
       return true; 

这是我的主 - 画类

public class Draw extends Activity { 
    DrawView drawView; 
    SignatureView signature; 
    private RelativeLayout parent; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     parent = (RelativeLayout) findViewById(R.id.signImageParent); 
     signature = new SignatureView(getApplicationContext(), null); 
     signature.setColor(Color.MAGENTA); 
     parent.addView(signature); 

    } 

    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.my_options_menu, menu); 
     return true; 
    } 

    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
     case R.id.clear: 
      signature.clear(); 
      return true; 

     case R.id.red: 
      DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); 
      Date date = new Date(); 
      String FILENAME="Boenka"; 
      FileOutputStream fos = null; 
      try { 
       fos = openFileOutput(FILENAME, Context.MODE_WORLD_READABLE); 
      } catch (FileNotFoundException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      parent.setDrawingCacheEnabled(true); 
      Bitmap bitmap = Bitmap.createBitmap(parent.getWidth(), parent.getHeight(), Bitmap.Config.ARGB_8888); 
      Canvas canvas = new Canvas(bitmap); 
      parent.draw(canvas); 
      bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos); 
      return true; 

     case R.id.blue: 
      signature.setColor(Color.BLUE); 
      return true; 
     case R.id.yellow: 
      signature.setColor(Color.YELLOW); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 
    } 

    @Override 
    public void onBackPressed() { 
     this.finish(); 
     super.onBackPressed(); 
    } 
} 

Answer 1

public void saveImage(Bitmap b,int count) throws Exception 
    { 

     String path = Environment.getExternalStorageDirectory().toString(); 
     OutputStream fOut = null; 

     String s=at.getText().toString(); 
     String alphaAndDigits = s.replaceAll("[^a-zA-Z0-9]+","_"); 


     String fileName = alphaAndDigits+"_"+wr.name+"_"+count; 
     File file = new File(path, fileName+".jpg"); 
     newFile=Uri.fromFile(file); 
     uris.add(newFile); 
     fOut = new FileOutputStream(file); 

     b.compress(Bitmap.CompressFormat.JPEG, 85, fOut); 
     fOut.flush(); 
     fOut.close(); 

     MediaStore.Images.Media.insertImage(getContentResolver(),file.getAbsolutePath(),file.getName(),file.getName()); 
    } 

试试这个功能，它的工作很适合我，这是保存位图请确保绘图缓存工作正常。

Answer 2

尝试下面的代码，它的工作原理

添加下面的权限清单中

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

MainActivity.java

public class MainActivity extends Activity implements OnClickListener{ 
private DrawableView drawableView; //here I have taken customview, it is optional, I am saving this view as image. You can take any layout or view 
private Button saveBtn; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    drawableView = (DrawableView) findViewById(R.id.drawable_view); 
    saveBtn = (Button) findViewById(R.id.save_btn); 
    saveBtn.setOnClickListener(this); 
} 

@Override 
public void onClick(View v) { 
    int id = v.getId(); 
    switch (id) { 
    case R.id.save_btn: 
     File file = saveBitMap(this, drawableView); //which view you want to pass that view as parameter 
     if (file != null) { 
      Log.i("TAG", "Drawing saved to the gallery!"); 
     } else { 
      Log.i("TAG", "Oops! Image could not be saved."); 
     } 
     break; 
    default: 
     break; 
    } 

private File saveBitMap(Context context, View drawView){ 
    File pictureFileDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"Handcare"); 
    if (!pictureFileDir.exists()) { 
     boolean isDirectoryCreated = pictureFileDir.mkdirs(); 
     if(!isDirectoryCreated) 
      Log.i("ATG", "Can't create directory to save the image"); 
     return null; 
    } 
    String filename = pictureFileDir.getPath() +File.separator+ System.currentTimeMillis()+".jpg"; 
    File pictureFile = new File(filename); 
    Bitmap bitmap =getBitmapFromView(drawView); 
    try { 
     pictureFile.createNewFile(); 
     FileOutputStream oStream = new FileOutputStream(pictureFile); 
     bitmap.compress(CompressFormat.PNG, 100, oStream); 
     oStream.flush(); 
     oStream.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
     Log.i("TAG", "There was an issue saving the image."); 
    }  
     scanGallery(pictureFile.getAbsolutePath(), context); 
    return pictureFile; 
} 
//create bitmap from view and returns it 
private Bitmap getBitmapFromView(View view) { 
    //Define a bitmap with the same size as the view 
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888); 
    //Bind a canvas to it 
    Canvas canvas = new Canvas(returnedBitmap); 
    //Get the view's background 
    Drawable bgDrawable =view.getBackground(); 
    if (bgDrawable!=null) { 
     //has background drawable, then draw it on the canvas 
     bgDrawable.draw(canvas); 
    } else{ 
     //does not have background drawable, then draw white background on the canvas 
     canvas.drawColor(Color.WHITE); 
    } 
    // draw the view on the canvas 
    view.draw(canvas); 
    //return the bitmap 
    return returnedBitmap; 
} 
// used for scanning gallery 
private void scanGallery(Context cntx, String path) { 
    try { 
     MediaScannerConnection.scanFile(cntx, new String[] { path },null, new MediaScannerConnection.OnScanCompletedListener() { 
      public void onScanCompleted(String path, Uri uri) { 
      } 
     }); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

}