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">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello_world"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:orientation="horizontal"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Next"
android:id="@+id/btnNext"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dip"
android:text="Exit"
android:id="@+id/btnExit"/>
</LinearLayout>
</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">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:orientation="horizontal">
<TextView
android:layout_width="80dip"
android:layout_height="wrap_content"
android:text="Username:"
android:id="@+id/lblUser"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/txtUser"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:orientation="horizontal">
<TextView
android:layout_width="80dip"
android:layout_height="wrap_content"
android:text="Password:"
android:id="@+id/lblPass"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/txtPass"
android:password="true" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dip"
android:gravity="right"
android:id="@+id/linearLayout3">
<Button
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Login"
android:id="@+id/btnLogin"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Exit"
android:id="@+id/btnExit"/>
</LinearLayout>
</LinearLayout>
5. Fifth, modify your AndroidManifest.xml like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloworld" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Main"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="7"/>
</manifest>
Finally, Run your app with emulator or your mobile device
you can set textview as a password field for make the text of password to asterisk or dot like the picture above
thanks for reading my blog, any error or something you can comment below