react-native run-android真机测试，提示run in dev mode

Question

使用react-native init 的项目，react-native run-android真机测试，提示如图所示

Answer 1

If you need to access to the DevSettingsActivity add to your AndroidManifest.xml:

<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />

If your app is targeting the Android API level 23 or greater, make sure you have the permission android.permission.SYSTEM_ALERT_WINDOW enabled for the development build. You can check this with Settings.canDrawOverlays(this);. This is required in dev builds because React Native development errors must be displayed above all the other windows. Due to the new permissions system introduced in the API level 23 (Android M), the user needs to approve it. This can be achieved by adding the following code to your Activity's in onCreate() method.

private final int OVERLAY_PERMISSION_REQ_CODE = 1;  // Choose any value

...

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (!Settings.canDrawOverlays(this)) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                                   Uri.parse("package:" + getPackageName()));
        startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);
    }
}

see:
http://facebook.github.io/rea...