Милан Видић Милан Видић - 1 month ago 7
Android Question

How to change ImageView source from different XML?

I want to change images in my popupwindow. I am trying to change ImageView image source which is in

test.xml
while my contentView is
activity_main
. When I try to just call
imageView.setImageResource(android.R.drawable.ic_menu_help);
it gives me
nullpointerexception
I realized i have to use inflate method, but when I use it it doesn't do what I want.I know there is a lot of questions regarding this, but none of them really helped me.
This is activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relative"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.android.popupwindow.MainActivity">

<Button
android:text="Test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />

</RelativeLayout>


test.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_blue_dark"
android:id="@+id/test1"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear1">

<ImageView
android:layout_width="75dp"
android:layout_height="75dp"
android:src="@android:drawable/btn_star_big_on"
android:id="@+id/imageView1"
android:layout_weight="1"
/>
</LinearLayout>

</RelativeLayout>


my main.java:

public class MainActivity extends AppCompatActivity {

private PopupWindow popupWindow;
private RelativeLayout relativeLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button test = (Button) findViewById(R.id.button);
relativeLayout = (RelativeLayout) findViewById(R.id.relative);

final View view1 = getLayoutInflater().inflate(R.layout.test, null);
ImageView imageView = (ImageView) view1.findViewById(R.id.imageView1);
imageView.setImageResource(android.R.drawable.ic_menu_help); //Image source is not changed in my popupWindow,
// but it is changed when I call relativeLayout.addView(view1);

test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//relativeLayout.addView(view1); // <-- this does the trick, but its not what i want
View container = getLayoutInflater().inflate(R.layout.test, null);

popupWindow = new PopupWindow(container, android.app.ActionBar.LayoutParams.MATCH_PARENT, android.app.ActionBar.LayoutParams.WRAP_CONTENT, true);
popupWindow.showAtLocation(relativeLayout, Gravity.BOTTOM, 0, 0);
container.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
popupWindow.dismiss();
return true;
}
});
}
});
}
}

Answer

You're inflating two separate views. Obviously what you do in one will have no impact on the other. You should set the popup view to your originally inflated view:

popupWindow = new PopupWindow(view1,
        RelativeLayout.LayoutParams.MATCH_PARENT, 
        RelativeLayout.LayoutParams.WRAP_CONTENT,
        true);