由于我制作了一个手电筒应用程序，它可以在SDK 22及以下的设备上正常工作。但是，当我来检查棉花糖及以上的设备时，它只是在开始时没有运行和崩溃，只是我使用以下代码请求许可，但它似乎根本不起作用。这是我在运行时请求相机权限的代码。这是我的代码：
if( ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{android.Manifest.permission.CAMERA},
5);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 5) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Now user should be able to use camera
}
else {
// Your app will not have this permission. Turn off all functions
// if permission not granted it will force close the app
}
}
我曾尝试使用棉花糖，牛轧糖设备，但它不会要求相机许可，我必须从setting-app-flashlight-permission-allow手动完成。请有人帮帮我。目前，我正在Lineage os 7.1.1
答案 0 :(得分：2)
您需要在清单中添加SDK 23权限。在清单中添加以下行，然后您将获得运行时权限回调。
<uses-permission-sdk-23 android:name="android.permission.CAMERA"/>
答案 1 :(得分：1)
只有你的代码完美无缺，才能改变，
if( ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{android.Manifest.permission.CAMERA},
5);
}
}
到
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if( ContextCompat.checkSelfPermission(this,
android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{android.Manifest.permission.CAMERA},
5);
}
}
答案 2 :(得分：1)
使用以下代码并调用＆＃34; requestPermission＆＃34; onCreate of Activity中的方法：
private static final int REQUEST_CODE_PERMISSION = 2;
List<String> mPermission=new ArrayList<String>();
public void requestPermission()
{
try {
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= MockPackageManager.PERMISSION_GRANTED)
mPermission.add(Manifest.permission.CAMERA);
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= MockPackageManager.PERMISSION_GRANTED
)
mPermission.add(Manifest.permission.WRITE_EXTERNAL_STORAGE
);
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= MockPackageManager.PERMISSION_GRANTED)
mPermission.add(Manifest.permission.READ_EXTERNAL_STORAGE);
if(mPermission.size()>0)
{
String[] array = mPermission.toArray(new String[mPermission.size()]);
ActivityCompat.requestPermissions(this, array, REQUEST_CODE_PERMISSION);
// If any permission aboe not allowed by user, this condition will execute every tim, else your else part will work
}
} catch (Exception e) {
e.printStackTrace();
}
}
覆盖方法＆＃34; onRequestPermissionsResult＆＃34;：
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
Log.e("Req Code", "" + requestCode);
if (requestCode == REQUEST_CODE_PERMISSION) {
if (grantResults.length == mPermission.size()) {
for(int i=0;i<grantResults.length;i++)
{
if(grantResults[i] == MockPackageManager.PERMISSION_GRANTED)
{
//don't do anything....
}
else{
mPermission=new ArrayList<String>();
requestPermission();
break;
}
}
}
else{
Toast.makeText(this,"permition not granted",Toast.LENGTH_LONG).show();
mPermission=new ArrayList<String>();
requestPermission();
}
}
}
答案 3 :(得分：1)
if(currentAPIVersion>= 23)
{
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("Camera Permission Necessary");
alertBuilder.setMessage("Camera permission is necessary");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
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;
}
答案 4 :(得分：0)
这样做：
if (ContextCompat.checkSelfPermission(UserProfileActivity.this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(UserProfileActivity.this, new String[]{Manifest.permission.CAMERA},
5);
} else {
//start flashlight
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
switch (requestCode) {
case 5: {
for (int i = 0; i < permissions.length; i++) {
if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
//start flashlight
Log.d("Permissions CAMERA", "Permission Granted: " + permissions[i]);
} else if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
Log.d("Permissions CAMERA", "Permission Denied: " + permissions[i]);
}
}
break;
}
default: {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
} break;
}
}
答案 5 :(得分：0)
我也有同样的问题，但设法修复它。这是我的情况（我不知道它是否与你的相同，但值得一试）
所以我有两个活动：MainActivity和FlashlightActivity。
我曾经在点击开关按钮之前在FlaslightActivity中明确要求相机许可，但我忘了我正在检查用户的手机是否有onCreate()方法中的相机。当我要求允许onClick手电筒的开关按钮时，我检查了用户的手机是否有相机。所以我所做的就是在我MainActivity之前就FlashlightActivity请求获得许可。
flashBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(hasPermission()){
Intent flashIntent = new Intent("FlashlightActivity");
startActivity(flashIntent);
}else{
requestPermission();
}
}
});
所以在你调用任何与相机有关的东西之前，基本上都要求获得许可