Question

Design an Android application that deploys layouts, widgets, styles, Intents or Fragments to perform a particular function (e.g. Phone App, Calendar App, Shopping App, etc.).  The Android application MUST follow the Google layout rules.  Java and Android studio are the required programming language and integrated development environment respectively

Answer 1

//AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.narendra.intentexample">
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <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>

//strings.xml

<resources>
    <string name="app_name">Intent Example</string>
    <string name="calender">Calender</string>
    <string name="phone">Dialer</string>

</resources>

//activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.example.narendra.intentexample.MainActivity">


    <Button
        android:id="@+id/phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/phone"
        android:layout_marginLeft="16dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
         android:onClick="launchDialer"
        />

    <Button
        android:id="@+id/calender"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/calender"
        app:layout_constraintLeft_toRightOf="@+id/phone"
        android:layout_marginLeft="16dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="16dp"
        android:onClick="launchCalender"
        />



</android.support.constraint.ConstraintLayout>

//MainActivity.java

package com.example.narendra.intentexample;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.util.List;

public class MainActivity extends AppCompatActivity {

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

    public void launchDialer(View view)
    {
Intent phoenIntent = new Intent(Intent.ACTION_DIAL);
        startActivity(phoenIntent);
    }
    public void launchCalender(View view) {

        PackageManager packmngr = this.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> list = packmngr.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED);
        ResolveInfo Resolvebest = null;
        for (final ResolveInfo info : list) {
            if (info.activityInfo.packageName.endsWith(".calendar"))
                Resolvebest = info;
        }
        if (Resolvebest != null) {
            intent.setClassName(Resolvebest.activityInfo.packageName,
                    Resolvebest.activityInfo.name);
            startActivity(intent);
        }
    }

}

//Output:-->