Mobile Application Development Practical 14 – getitnotes

Mobile Application Development Practical 14

Question 1

Write a program to display following output.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/lstv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="#8A8585"
        android:dividerHeight="1dp"
        android:listSelector="#F28DD8FA"
        />
</androidx.constraintlayout.widget.ConstraintLayout>

activity_list.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ListActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/listText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:textSize="20dp"
            android:text="TextView" />
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.practical14;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    String langlist[]={"C","C++","Java","Python","Android","Html","Php","Ruby"};
    ListView list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list=findViewById(R.id.lstv);
        ArrayAdapter<String> ard=new ArrayAdapter<>(this,R.layout.activity_list,R.id.listText,langlist);
        list.setAdapter(ard);

        AdapterView.OnItemClickListener icl=new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(MainActivity.this,"Selected "+langlist[i],Toast.LENGTH_LONG).show();
            }
        };
        list.setOnItemClickListener(icl);
    }
}

Output

Question 2

Write a program to display an image using Image View and a button named as "Change Image". Once you click on button another image should get displayed.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="match_parent"
            android:layout_height="394dp"
            android:src="@drawable/img1"
            android:scaleType="fitXY"/>

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center"
            android:layout_marginBottom="50dp"
            android:text="Change Image" />
    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.practical14_2;

import androidx.appcompat.app.AppCompatActivity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    Button b;
    ImageView iv;
    Drawable dr;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b=findViewById(R.id.button);
        iv=findViewById(R.id.imageView);

        View.OnClickListener cl=new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                iv.setImageResource(R.drawable.img2);
            }
        };
        b.setOnClickListener(cl);
    }
}

Output

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