Archive for May 2016

Here’s the few step to make first app on android studio, just 5 steps. Okay, let’s begin.

1. First, create Main.java for main activity. Here’s the code:

package com.example.helloworld;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class Main extends AppCompatActivity {

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

        Button btnNext = (Button) findViewById(R.id.btnNext);
        btnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onClickNext();
            }
        });

        Button btnExit = (Button) findViewById(R.id.btnExit);
        btnExit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

}

    public void onClickNext() {
        Intent intent = new Intent().setClass(this, LoginActivity.class);
        startActivity(intent);
    }

}

2. Second, put code below to main.xml for main activity interface

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

</LinearLayout>

3. Third, create new activity for LoginActivity.java

package com.example.helloworld;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {

Button btnLogin, btnExit;
EditText txtUser, txtPass;

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

        btnLogin = (Button) findViewById(R.id.btnLogin);
        btnExit = (Button) findViewById(R.id.btnExit);
        txtUser = (EditText) findViewById(R.id.txtUser);
        txtPass = (EditText) findViewById(R.id.txtPass);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String txt = "Your username is: "
                        + txtUser.getText().toString()
                        + "\nYour password is: "
                        + txtPass.getText().toString();
                Toast.makeText(LoginActivity.this, txt.trim(),
                        Toast.LENGTH_LONG).show();
            }
        });

        btnExit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
                return;
            }
        });
    }
}

4. Fourth, then put this code to login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="5dip">