Change elevation at run-time, by calling setZ()

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This example show how to change elevation of ImageView programmatically, by calling setZ().


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:orientation="vertical"
tools:context="com.blogspot.android_er.androidzelevation.MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold"/>

<SeekBar
android:id="@+id/z"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:progress="20"
android:max="100"/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:elevation="20dp"
android:background="@android:color/background_dark"
android:src="@mipmap/ic_launcher"/>
</LinearLayout>

</LinearLayout>



package com.blogspot.android_er.androidzelevation;

import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity {

SeekBar seekBarZ;
ImageView image;

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

seekBarZ = (SeekBar)findViewById(R.id.z);
image = (ImageView)findViewById(R.id.image);

seekBarZ.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
image.setZ(i);
}
}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {

}
});
}
}


more:
elevation effect of overlapped view

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