I often have to deal with this kind an error when programming in Java on Android. For example I have a class where I set a flag.
public class ViewActivity extends Activity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
...
}
In another class I want to reset the FLAG_KEEP_SCREEN_ON
class DrawOnTop extends View {
...
if (condition) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
but this doesn't work, since I get "The method getWindow is undefined for the type DrawOnTop".
So I try to define a clearFlags method in ViewActivity class
void clearFlags() {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
and to call it from the DrawOnTop class:
if (condition) {
ViewActivity.clearFlags();
}
This doesn't work as well: I get "Cannot make a static reference to the non-static method clearFlags() from the type ViewActivity". Well, let's make it static then.
static void clearFlags() {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
and then I get "Cannot make a static reference to the non-static method getWindow from the type Activity"
How could I execute such a statement?
If your DrawOnTop class is nested within the ViewActivity you can create a local Context variable and use it to call the getWindow(). If that's not the case then create a receiver in your activity class then from DawOnTop send an intent with your trigger to do whatever the job is. Do not instantiate your activity class, bad idea!
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