图库意图不起作用

时间:2015-01-12 05:31:37

标签: android android-intent android-gallery

我遇到了奇怪的行为。我想用Intent调出画廊。然后onActivityResult()我想采取Uri并将其转换为Bitmap。我面临的问题是首先选择图像会导致手机冻结几秒钟。然后,当它返回到onActivityResult()时,即使我选择了一个图像,resultCode值也是-1。我在步骤中遗漏了什么吗?

启动Gallery Intent

Intent intent = new Intent(Intent.ACTION_PICK, 
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, GALLERY_REQUEST_CODE);

我的onActivityResult

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == GALLERY_REQUEST_CODE) {
        Uri selectedImageUri = data.getData();
        if (selectedImageUri != null) {
            try {
                String[] filePathColumn = { MediaStore.Images.Media.DATA };
                Cursor cursor = getContentResolver().query(
                        selectedImageUri, filePathColumn, null, null, null);
                cursor.moveToFirst();
                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                String filePath = cursor.getString(columnIndex);
                cursor.close();

                Bitmap mBitmap = BitmapFactory.decodeFile(filePath);
                LogUtil.e(TAG, "mBitmap: " + mBitmap);
                ByteArrayOutputStream bs = new ByteArrayOutputStream();
                mBitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);

                Intent intent = new Intent(CameraActivity.this,
                        SecondActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP
                        | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.putExtra("image", bs.toByteArray());
                startActivity(intent);
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    } else {
        return;
    }
}

更新: 我有清单的许可。我也收到了正确的Uri。但在选择图像后,我总是收到resultCode = -1。我似乎收到了一个失败的活页夹交易。

我可能错过任何权限吗?提前谢谢!

1 个答案:

答案 0 :(得分:1)

要使此代码工作,您需要写入权限,检查清单中是否包含此代码。

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