我正在尝试让我的Android相机应用程序在更新版本的Android上运行，并且已经跟随谷歌的开发人员课程＆＃34;在运行时请求权限＆＃34;相当紧密，但我仍然在logcat中得到错误，当我尝试打开相机时应用程序崩溃。我不明白我在这里做错了什么。 以下是我的代码中的相关方法：
private void showPictureDialog() {
AlertDialog.Builder pictureDialog = new AlertDialog.Builder(this);
pictureDialog.setTitle("Select Action");
String[] pictureDialogItems = {
"Select photo from gallery",
"Capture photo from camera"};
pictureDialog.setItems(pictureDialogItems,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
choosePhotoFromGallary();
break;
case 1:
checkPermissionsR();
break;
}
}
});
pictureDialog.show();
}
public void checkPermissionsR() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
takePhotoFromCamera();
} else {
if (shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
Toast.makeText(this, "need external storage permission", Toast.LENGTH_SHORT).show();
}
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSIONS);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == REQUEST_PERMISSIONS) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
takePhotoFromCamera();
} else
Toast.makeText(this, "permission was not granted to save images", Toast.LENGTH_SHORT).show();
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
此外，我不认为问题出现在这里，但我也会将此部分包括在内以防万一。
private void takePhotoFromCamera() {
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == this.RESULT_CANCELED) {
return;
}
if (requestCode == GALLERY) {
if (data != null) {
Uri contentURI = data.getData();
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), contentURI);
String path = saveImage(bitmap);
Toast.makeText(MainActivity.this, "Image Saved!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Failed!", Toast.LENGTH_SHORT).show();
}
}
} else if (requestCode == CAMERA) {
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
saveImage(thumbnail);
Toast.makeText(MainActivity.this, "Image Saved!", Toast.LENGTH_SHORT).show();
}
RecyclerView.Adapter newImageAdapter = new ImageAdapter(BingoGalleryFolder); //***************//
recycleView.swapAdapter(newImageAdapter,false);
}
public String saveImage(Bitmap myBitmap) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
File wallpaperDirectory = new File(Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
// have the object build the directory structure, if needed.
if (!wallpaperDirectory.exists()) {
wallpaperDirectory.mkdirs();
}
try {
File f = new File(wallpaperDirectory, Calendar.getInstance()
.getTimeInMillis() + ".jpg");
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
MediaScannerConnection.scanFile(this,
new String[]{f.getPath()},
new String[]{"image/jpeg"}, null);
fo.close();
Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());
return f.getAbsolutePath();
} catch (IOException e1) {
e1.printStackTrace();
}
return "";
}
答案 0 :(得分：1)
我希望这会对你有所帮助，它在我的项目中运行良好。
public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 123;
public static final int MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 124;
public static final int MY_PERMISSIONS_REQUEST_CAMERA = 124;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public static boolean checkPermissionread(final Context context) {
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.READ_EXTERNAL_STORAGE)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("External storage permission is necessary");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public static boolean checkPermissionwrite(final Context context) {
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.CAMERA)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("External storage permission is necessary");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public static boolean checkPermissioncamera(final Context context) {
int currentAPIVersion = Build.VERSION.SDK_INT;
if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Permission necessary");
alertBuilder.setMessage("External storage permission is necessary");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
protected ProgressDialog mProgressDialog;
protected void showProgressDialog(String title,String message)
{
/* if(mProgressDialog!=null)
{
mProgressDialog.dismiss();
}*/
mProgressDialog = ProgressDialog.show(this,title,message);
}
答案 1 :(得分：1)
在您的情况下1，您正在获得编写外部存储空间的许可，您应该获得使用相机的许可，首先提到您的清单中的权限。
<uses-permission android:name="android.permission.CAMERA" />
并在 checkPermissionsR（）中获取此权限
ContextCompat.checkSelfPermission(this, Manifest.permission.Camera)
答案 2 :(得分：1)
尝试在启动应用程序时立即请求所有权限。
就像你的MainActivity
首先在onCreate方法中调用此方法：
checkPermissions();
然后尝试调用这些方法：
private void checkPermissions() {
if (Build.VERSION.SDK_INT >= 23) {
if (!checkAllPermission())
requestPermission();
}
}
private void requestPermission() {
ActivityCompat.requestPermissions(MainActivity.this, new String[]
{
CAMERA,
READ_EXTERNAL_STORAGE,
WRITE_EXTERNAL_STORAGE,
//check more permissions if you want
........
}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length > 0) {
boolean CameraPermission = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean ReadExternalStatePermission = grantResults[1] == PackageManager.PERMISSION_GRANTED;
boolean ReadWriteStatePermission = grantResults[2] == PackageManager.PERMISSION_GRANTED;
//
.......
if (CameraPermission && ReadExternalStatePermission && ReadWriteStatePermission) {
Toast.makeText(MainActivity.this, "Permissions acquired", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "One or more permissions denied", Toast.LENGTH_LONG).show();
}
}
break;
default:
break;
}
}
public boolean checkAllPermission() {
int FirstPermissionResult = ContextCompat.checkSelfPermission(getApplicationContext(), CAMERA);
int SecondPermissionResult = ContextCompat.checkSelfPermission(getApplicationContext(), READ_EXTERNAL_STORAGE);
int ThirdPermissionResult = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);
.....
return FirstPermissionResult == PackageManager.PERMISSION_GRANTED &&
SecondPermissionResult == PackageManager.PERMISSION_GRANTED &&
ThirdPermissionResult == PackageManager.PERMISSION_GRANTED
}
答案 3 :(得分：0)
试试这个
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
//Show Information about why you need the permission
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Storage Permission");
builder.setMessage("This app needs storage permission.");
builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_PERMISSION_CONSTANT);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
} else if (permissionStatus.getBoolean(Manifest.permission.WRITE_EXTERNAL_STORAGE,false)) {
//Previously Permission Request was cancelled with 'Dont Ask Again',
// Redirect to Settings after showing Information about why you need the permission
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Storage Permission");
builder.setMessage("This app needs storage permission.");
builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
sentToSettings = true;
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, REQUEST_PERMISSION_SETTING);
Toast.makeText(getBaseContext(), "Go to Permissions to Grant Storage", Toast.LENGTH_LONG).show();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
} else {
//just request the permission
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_PERMISSION_CONSTANT);
}
SharedPreferences.Editor editor = permissionStatus.edit();
editor.putBoolean(Manifest.permission.WRITE_EXTERNAL_STORAGE,true);
editor.commit();
} else {
//You already have the permission, just go ahead.
proceedAfterPermission();
}
答案 4 :(得分：-1)
尝试向MANIFEST文件添加权限。
<uses-permission android:name="android.permission.CAMERA" />
并在checkPermissionsR（）中获得此权限
ContextCompat.checkSelfPermission(this, Manifest.permission.Camera)