Android 工作室危险权限

Question

我正在尝试通过我的应用程序更改 system/phone 亮度。为此，我需要征得许可 ("dangerous permission")。我不确定我是否采用了正确的方法，但这似乎并不奏效，因为它总是 returns 权限被拒绝。

public void switches() {
            if (systemBrightness) {
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.WRITE_SETTINGS},
                        1);
                Toast.makeText(this, "Changed to system brightness: changing the “system brightness” is permanent", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "Changed to screen brightness: ", Toast.LENGTH_SHORT).show();
            }
        }


public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case 1: {

                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.
                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

//马尼节

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




  public void changeScreenBrightness(float brightness) {
        mBrightness = brightness;
        if (systemBrightness) {
            if (!Settings.System.canWrite(this)) {
                Intent i = new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS);
                startActivity(i);
            } else {
                Settings.System.putInt(mContentResolver, Settings.System.SCREEN_BRIGHTNESS, (int) (mBrightness * 255)* preset);
            }
        } else {
            WindowManager.LayoutParams mLayoutParams = mWindow.getAttributes();
            mLayoutParams.screenBrightness = mBrightness * preset;
            mWindow.setAttributes(mLayoutParams);
        }
    }

Answer 1

请求危险权限的处理方式不同于易受攻击的权限。您需要使用 Settings.System.canWrite(Context) 方法来检查您是否可以这样做。如果没有通过调用 startActivityForResult:

向系统发送适当的 Intent

public boolean checkWriteSettingsPermission() {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
        return true;
    }
    if (!Settings.System.canWrite(getContext())) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS,
            Uri.parse("package:" + getPackageName()));
        startActivityForResult(intent, REQUEST_CODE);
        return false;
    } else {
        return true;
    }
}

documentation

中写的所有内容