Question

我正在使用以下代码检查权限。我总是到达shouldShowRequestPermissionRationale为真的部分。然后显示Toast但不显示权限对话框。

// 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);
        }
    }

这是我的应用模块：

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'
}

在Manifest中，我已经宣布了许可：

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

该应用在Lollipop设备中运行良好。我要求允许更改系统亮度。

Answer 1

我找到了答案。我们需要请求以不同方式更改设置的权限。我们需要通过意图打开一个活动，然后用户将允许我们的应用程序。这是代码：

 // 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
        }

未调用ActivityCompat.requestPermissions

1 个答案: