How to determine the size of an android view at run time?

Android Apps/Applications Mobile Development

This example demonstrates how do I determine the size of an android view at run time.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<RelativeLayout 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="8dp"
   android:orientation="vertical"
   tools:context=".MainActivity">
   <ImageView
      android:id="@+id/imageView"
      android:layout_width="match_parent"
      android:layout_height="400dp"
      android:layout_gravity="center"
      android:layout_margin="20sp"
      android:src="@drawable/image"/>
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:layout_marginTop="20sp"
      android:textSize="16sp"
      android:textStyle="bold"
      android:layout_below="@id/imageView"/>
</RelativeLayout>

Step 3 – Copy and paste an image (.png/.jpg/.jpeg) into res/drawable

Step 4 − Add the following code to src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   ImageView imageView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      imageView = findViewById(R.id.imageView);
      imageView.getViewTreeObserver().addOnGlobalLayoutListener(new GetViewSize());
   }
   class GetViewSize implements ViewTreeObserver.OnGlobalLayoutListener {
      @Override
      public void onGlobalLayout() {
         View v = findViewById(R.id.imageView);
         String x = Integer.toString(v.getWidth());
         String y = Integer.toString(v.getHeight());
         ((TextView)findViewById(R.id.textView)).setText(String.format("Width %s, Height: %s", x, y));
      }
   }
}

Step 5 − Add the following code to androidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –

Click here to download the project code.

Azhar

Published on 04-Sep-2019 12:58:58

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