examples in android studio

 

EX/ program celsius to fahrenheit and  fahrenheit to celsius ?

sol//

XML 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:layoutDirection="ltr"
    android:textDirection="ltr"
    tools:context=".degress">

    <EditText
        android:id="@+id/edit1"
        android:layout_width="150sp"
        android:layout_height="wrap_content"
        android:layout_marginTop="100sp"
        android:layout_marginLeft="120sp"
        android:hint="enter"/>
    <Button
        android:id="@+id/fToc"
        android:layout_below="@id/edit1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="120sp"
        android:layout_marginTop="20sp"
        android:text="ftoc"/>
    <Button
        android:id="@+id/cTof"
        android:layout_below="@id/fToc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="120sp"
        android:layout_marginTop="20sp"
        android:text="ctof"/>

    <TextView
        android:id="@+id/result"
        android:layout_below="@id/cTof"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20sp"
        android:layout_marginLeft="120sp"
        android:text="0 Degress"/>

</RelativeLayout>

JAVA

package com.project.test;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class degress extends AppCompatActivity {
private Button cTof,fToc;
private TextView res;
private EditText enter;
double res0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_degress);

        cTof=findViewById(R.id.cTof);
        fToc=findViewById(R.id.fToc);
        res=findViewById(R.id.result);
        enter=findViewById(R.id.edit1);

        cTof.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double temp=Double.parseDouble(enter.getText().toString());
                res0=(temp *1.8) + 32;
                res.setText(String.valueOf(res0));
            }
        });

        fToc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double temp=Double.parseDouble(enter.getText().toString());
                res0=(temp -32) / 1.8;
                res.setText(String.valueOf(res0));
            }
        });
    }
}

EX/ Q1) Contract application mobile using eclipse android (using XML and Java languages) is calculated

100*500=50000 and reset it and emulated this application. The application has Blue

background, the button is Yellow color.

sol/

XML

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#0000FF"

android:orientation="vertical" >

<TextView

android:id="@+id/result"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="0"

android:textSize="20sp"

android:textStyle="bold" />

<Button

android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Reset"

android:textColor="#FFFFFF"

android:background="#FFFF00" />

</LinearLayout>

JAVA

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

private TextView result;

private Button button;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

result = (TextView) findViewById(R.id.result);

button = (Button) findViewById(R.id.button);

// perform the calculation on app launch

int calculation = 100*500;

result.setText(String.valueOf(calculation));

// set on click listener for the button

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

result.setText("0");

}

});

}

}

ex/Write the code with example the array in listview in java eclipse?

sol//

XML

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0000FF"
    android:orientation="vertical" >

    



    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />


</LinearLayout>

JAVA

package com.project.test;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);

        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, items);
        listView.setAdapter(adapter);

       
    }
}

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