將位圖保存到文件並返回包含位圖圖像的文件

Question

我有一個將位圖保存到文件的問題。 我的方法是這樣的：

private File savebitmap(Bitmap bmp) { 
    String extStorageDirectory = Environment.getExternalStorageDirectory() 
      .toString(); 
    OutputStream outStream = null; 

    File file = new File(bmp + ".png"); 
    if (file.exists()) { 
     file.delete(); 
     file = new File(extStorageDirectory, bmp + ".png"); 
     Log.e("file exist", "" + file + ",Bitmap= " + bmp); 
    } 
    try { 
     outStream = new FileOutputStream(file); 
     bmp.compress(Bitmap.CompressFormat.PNG, 100, outStream); 
     outStream.flush(); 
     outStream.close(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    Log.e("file", "" + file); 
    return file; 

} 

它給了我錯誤file.I的正在調用該方法是這樣的：

Drawable d = iv.getDrawable(); 
Bitmap bitmap = ((BitmapDrawable) d).getBitmap(); 
File file = savebitmap(bitmap); 

請幫我...

Answer 1

我儘量讓你的代碼 一些更正我假設你想使用的文件名，而不是位圖作爲參數

private File savebitmap(String filename) { 
     String extStorageDirectory = Environment.getExternalStorageDirectory().toString(); 
     OutputStream outStream = null; 

     File file = new File(filename + ".png"); 
     if (file.exists()) { 
     file.delete(); 
     file = new File(extStorageDirectory, filename + ".png"); 
     Log.e("file exist", "" + file + ",Bitmap= " + filename); 
     } 
     try { 
     // make a new bitmap from your file 
     Bitmap bitmap = BitmapFactory.decodeFile(file.getName()); 

     outStream = new FileOutputStream(file); 
     bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream); 
     outStream.flush(); 
     outStream.close(); 
     } catch (Exception e) { 
     e.printStackTrace(); 
     } 
     Log.e("file", "" + file); 
     return file; 

    } 

Answer 2

你不能這樣寫

File file = new File(bmp + ".png"); 

，這行也有錯

file = new File(extStorageDirectory, bmp + ".png"); 

您必須給字符串值而不是位圖。

File file = new File(filename + ".png"); 

Answer 3

更改 File file = new File（bmp +「.png」）; 至 File file = new File（extStorageDirectory，「bmp.png」）;像你幾乎第二次做的那樣。