Android N拍照

Question

我正在创建一个需要制作照片并将其存储到外部存储的应用程序。现在，每当我点击按钮拍照时，它都会将视图设置回我的主要活动。我的代码有什么问题？

Report.java：

Button button1;
ImageView imageView1;
Uri file;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_report);
    overridePendingTransition(R.anim.slide_out, R.anim.slide_in);

    button1 = (Button) findViewById(R.id.button2);
    imageView1 = (ImageView) findViewById(R.id.imageView);

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        button1.setEnabled(false);
        ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    if (requestCode == 0) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
            button1.setEnabled(true);
        }
    }
}

public void takePicture(View view) {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    file = Uri.fromFile(getOutputMediaFile());
    intent.putExtra(MediaStore.EXTRA_OUTPUT, file);

    startActivityForResult(intent, 100);
}

private static File getOutputMediaFile(){
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES), "CameraDemo");

    if (!mediaStorageDir.exists()){
        if (!mediaStorageDir.mkdirs()){
            return null;
        }
    }

    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    return new File(mediaStorageDir.getPath() + File.separator +
            "NippesReportIMG_"+ timeStamp + ".jpg");
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 100) {
        if (resultCode == RESULT_OK) {
            imageView1.setImageURI(file);
        }
    }
}

奇怪的是它在android监视器中没有返回错误。

清单中相机的权限：

<uses-feature android:name="android.hardware.camera" android:required="true" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

按钮XML：

<Button
    android:text="Take picture"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:id="@+id/button2"
    android:layout_weight="1"
    android:onClick="takePicture"/>

有什么建议吗？