Question

我试图创建一个非常简单的应用程序，允许用户在提供的图像上书写并将其保存到他们的图库中。我尝试了下面的代码。它会触发错误，无法保存图像。

@Override
public boolean onOptionsItemSelected(MenuItem item) {


switch(item.getItemId()){
    case R.id.savebutton:
             Bitmap bitmap = ((BitmapDrawable)imagecp.getDrawable()).getBitmap();


            saveBitmap(bitmap);

    default:
        return super.onOptionsItemSelected(item);


}

public void saveBitmap(Bitmap bmp) {
    String _time = "";
    Calendar cal = Calendar.getInstance();
    int millisecond = cal.get(Calendar.MILLISECOND);
    int second = cal.get(Calendar.SECOND);
    int minute = cal.get(Calendar.MINUTE);
    int hourofday = cal.get(Calendar.HOUR_OF_DAY);
    _time = "image_" + hourofday + "" + minute + "" + second + ""
            + millisecond + ".png";
    String file_path = Environment.getExternalStorageDirectory()
            .getAbsolutePath();
    try {
        File dir = new File(file_path);
        if (!dir.exists())
            dir.mkdirs();
        File file = new File(dir, _time);
        FileOutputStream fOut = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.PNG, 90, fOut);
        fOut.flush();
        fOut.close();
        Toast.makeText(getApplicationContext(),
                "Image has been saved in Couponmaker folder",
                Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        Toast.makeText(getApplicationContext(),
                "saving failed",
                Toast.LENGTH_LONG).show();
        Log.e("error in saving image", e.getMessage());
    }
}

和错误消息

 E/error in saving image﹕ /storage/0C11-3814/image_162259256.png: open failed: EACCES (Permission denied)
W/EGL_emulation﹕ eglSurfaceAttrib not implemented
W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xad78df60, error=EGL_SUCCESS
E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xab7dd67 W/art﹕ Suspending all threads took: 13.866ms

xml文件

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

<application
    android:allowBackup="true"....

Answer 1

我相信Marshmallow，外部设备目录是sd卡目录。我试图在SD卡上写但是失败了。因为他们不允许这样做（我读到某处但是因为我忘记了所以我不能在这里添加链接）。图库不一定从外部存储中读取图像。看看这个答案，可能有助于解决您的问题：How to save image in android gallery

无法将imageview图像保存到图库..（eglSurfaceAttrib未实现）..（android）

1 个答案: