Friday, August 18, 2017

android - Determine if app open first time

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical"
    >
    <TextView
        android:id="@+id/text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:textStyle="bold"
        />
</LinearLayout>
MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {
    private Context mContext;
    private Activity mActivity;

    private LinearLayout mRootLayout;
    private TextView mTextView;

    private static final String IS_APP_FIRST_TIME_LAUNCH = "is_app_first_time_launch";

    SharedPreferences mSharedPreferences;
    SharedPreferences.Editor mEditor;

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

        // Get the application context
        mContext = getApplicationContext();
        mActivity = MainActivity.this;

        // Get the widget reference from xml layout
        mRootLayout = findViewById(R.id.root_layout);
        mTextView = findViewById(R.id.text_view);

        // Initialize shared preference and editor
        mSharedPreferences = getPreferences(Context.MODE_PRIVATE);
        mEditor = mSharedPreferences.edit();

        if(isAppFirstTimeLaunch()){
            mRootLayout.setBackgroundColor(Color.RED);
            mTextView.setText("APP is launch for first time.");
        }else {
            mRootLayout.setBackgroundColor(Color.GREEN);
            mTextView.setText("App previously opened.");
        }
    }

    // Custom method to check app is open first time or not
    protected boolean isAppFirstTimeLaunch(){
        if(mSharedPreferences.getBoolean(IS_APP_FIRST_TIME_LAUNCH,true)){
            // App is open/launch for first time
            // Update the preference
            mEditor.putBoolean(IS_APP_FIRST_TIME_LAUNCH,false);
            mEditor.commit();
            mEditor.apply();

            return true;
        }else {
            // App previously opened
            return false;
        }
    }
}