Question

我正在尝试从图片视图中保存图片，但我得到例外(Read-only file system)

我试过这段代码，

bitmap1 = imageView.getDrawingCache(); //for retrieving the Image

public void saveOnClick(View view)
{
    try 
    {
            String filename="qrimage";  
            FileOutputStream out = new FileOutputStream(filename);
            bitmap1.compress(Bitmap.CompressFormat.PNG, 90, out);
            Toast.makeText(getApplicationContext(), "Saved", Toast.LENGTH_SHORT).show();

    } 
    catch (Exception e) 
    {
           e.printStackTrace();
           Toast.makeText(getApplicationContext(), e.getMessage()+" Not Saved!", Toast.LENGTH_SHORT).show();
    }
}

Answer 1

用户权限

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

Answer 2

这是一个保存功能

void Save() {
    final File myDir = new File(folder);
    myDir.mkdirs();
    final Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    final String fname = "StyleMe-" + n + ".png";
    file = new File(myDir, fname);
    if (file.exists())
        file.delete();
    try {

        mCBitmap.compress(CompressFormat.JPEG, 100, out);

        out.flush();
        out.close();
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
                Uri.parse("file://"
                        + Environment.getExternalStorageDirectory())));
        Toast.makeText(getApplication(), "Image Saved", Toast.LENGTH_SHORT)
                .show();

    } catch (final Exception e) {

    }
}

只需在按钮上点击Save();即可。 P.S您必须修改名称和位图名称。

---将这些声明为全局

    static File file;
String folder = "/sdcard/Pictures/YourFolderName";

并且不要忘记设置读取和写入存储的权限。

Answer 3

试试这种方式

public void saveOnClick(View view)
    {
        try 
        {

                imageView.setDrawingCacheEnabled(true); //UPDATE HERE
                imageView.buildDrawingCache(); //UPDATE HERE
                bitmap1 = imageView.getDrawingCache(); //UPDATE HERE

                String filename="qrimage";  
                FileOutputStream out = new FileOutputStream(filename);
                bitmap1.compress(Bitmap.CompressFormat.PNG, 90, out);
                Toast.makeText(getApplicationContext(), "Saved", Toast.LENGTH_SHORT).show();

        } 
        catch (Exception e) 
        {
               e.printStackTrace();
               Toast.makeText(getApplicationContext(), e.getMessage()+" Not Saved!", Toast.LENGTH_SHORT).show();
        }
    }

Answer 4

首先确保您的应用已启用存储权限：

转到设备设置＆gt;设备＆gt;应用程序＆gt;应用程序管理器＆gt;＆＃34;您的应用＆＃34;＆gt;权限＆gt;启用存储权限！

清单中的权限：

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

因此，如果您想在文件存储中创建自己的目录，可以使用somethibng，如：

String myDate = getCurrentDateAndTime();
FileOutputStream outStream = null;
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File(sdCard.getAbsolutePath() + "/YourFolderName");
dir.mkdirs();
String fileName = "YourFileName_"+myDate+".jpg";
File outFile = new File(dir, fileName);
outStream = new FileOutputStream(outFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
//to refresh the gallery
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(Uri.fromFile(file));
sendBroadcast(intent);
}

希望这有帮助！

不从ImageView保存图像

4 个答案: