Usman Usman - 14 days ago 5
Android Question

ActivityCompat.requestPermissions not invoked

I am checking permission using the following code. I always reach the part where shouldShowRequestPermissionRationale is true. Then the Toast is shown but the permission dialog is not shown.

// checking permission
if (ContextCompat.checkSelfPermission(this,
"android.permission.WRITE_SETTINGS")
!= PackageManager.PERMISSION_GRANTED) {

// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
"android.permission.WRITE_SETTINGS")) {
// Show an expanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
Toast.makeText(this, "Please allow the app to change the settings otherwise the app cannot change the brightness for you", Toast.LENGTH_LONG).show();
ActivityCompat.requestPermissions(this,
new String[]{"android.permission.WRITE_SETTINGS"},
0);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{"android.permission.WRITE_SETTINGS"},
0);
}
}


Here's my app module:

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.2"

defaultConfig {
applicationId "com.appsbyusman.brightnesscontrol"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
}


In Manifest, I have declared the permission:

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


The app works fine in Lollipop device.
I am asking permission to change the system brightness.

Answer

I found the answer. We need to request permission to change settings in a different manner. We need to open an activity via intent and then the user will allow our app from there. Here's the code:

 // checking permission
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (!Settings.System.canWrite(this)) {
                Toast.makeText(this, "Please allow the app to change the settings", Toast.LENGTH_LONG).show();
                Intent intentt = new Intent(android.provider.Settings.ACTION_MANAGE_WRITE_SETTINGS);
                intentt.setData(Uri.parse("package:" + this.getPackageName()));
                intentt.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intentt);
            } else {
                changeBrightness(extras); // it's android M and we have permission. Do permission related work here.
            }
        } else {
            changeBrightness(extras); // It's pre android M and we have got permission at install time. Do permission related work here
        }
Comments