如何将图像保存到我的应用程序？

Question

我正在制作一个应用程序，它可以让用户拍照并将照片保存到应用程序中，该应用程序将受密码保护。到目前为止，该应用程序可以拍摄照片、检索照片并将其设置为图像视图。但是，当我重新启动应用程序时，图像消失了。如何保存？

int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 0;
Uri imageUri;

public void takePic(View view){


    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "filename_" +
            String.valueOf(System.currentTimeMillis()) + ".jpg"));
    intent.putExtra("data", imageUri);
    startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);



}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (resultCode == RESULT_OK) {
        if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {


            Bundle extras = data.getExtras();

            Log.e("URI", imageUri.toString());
            Bitmap bmp = (Bitmap) extras.get("data");
            ImageView imageView = (ImageView) findViewById(R.id.imageView);

            imageView.setImageBitmap(bmp);




        }
        else if (resultCode == RESULT_CANCELED) {
            Toast.makeText(this, "Picture was not taken", Toast.LENGTH_SHORT);
        }
    }


}

Answer 1

您传递给 Intent 的 imageUri - 图像文件保存在那里。只需将 URI 保存在 SharedPreferences 或其他持久存储中，并在下次启动应用时检查该存储。

Answer 2

这段代码对我有用：

private void takePicture() {

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    try {
        mImageCaptureUri = null;
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            mImageCaptureUri = Uri.fromFile(mFileTemp);

        }
        else {

            mImageCaptureUri = InternalStorageContentProvider.CONTENT_URI;

        }
        intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);
    } catch (Exception e) {

        Log.d("error", "cannot take picture", e);
    }
}

这是如何定义 mFileTemp

String state = Environment.getExternalStorageState();
File mFileTemp;
if (Environment.MEDIA_MOUNTED.equals(state)) {
//this is like that 
//any folder name/you can add inner folders like that/your photo    name122412414124.jpg
mFileTemp = new File(Environment.getExternalStorageDirectory()+File.separator+"any folder name"+File.separator+"you can add inner folders like that"
        , "your photo name"+System.currentTimeMillis()+".jpg");
mFileTemp.getParentFile().mkdirs();
}
else {
mFileTemp = new File(getFilesDir()+"any folder name"+
        File.separator+"myphotos")+File.separator+"profilephotos", "your photo name"+System.currentTimeMillis()+".jpg");
mFileTemp.getParentFile().mkdirs();
}

你的全局变量

private Uri mImageCaptureUri;
private File mFileTemp;

1) 定义全局变量

2) 然后定义mFileTemp

3)然后触发takePicture()方法