android.permission.WRITE_EXTERNAL_STORAGE 授予但访问被拒绝

Question

下面的代码输出是 "Write granted" 但之后出现错误 '/storage/emulated/0/Download/test.txt: open failed: EACCES (Permission denied)'

怎么了？

@RunWith(AndroidJUnit4.class)
public class FileStorageTest {

    private static final String TAG = FileStorageTest.class.getSimpleName();

    @Test
    public void test() throws Exception {
        Context context = InstrumentationRegistry.getTargetContext();
        if (context.checkSelfPermission("android.permission.WRITE_EXTERNAL_STORAGE") == PackageManager.PERMISSION_GRANTED) {
            Log.d(TAG, "Write granted");
        } else {
            Log.e(TAG, "Write refused");
        }

        File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),"test.txt");
        new FileOutputStream(file).close();
    }
}

Answer 1

尝试将其添加到您的清单文件中：

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

Answer 2

You need to also add READ_EXTERNAL_STORAGE permission to read data from the device.

Add this permission also at RunTime.

    if (context.checkSelfPermission("android.permission.READ_EXTERNAL_STORAGE") == PackageManager.PERMISSION_GRANTED) {
            Log.d(TAG, "Read granted");
    } else {
            Log.e(TAG, "Read refused");
    }