Today i'm gonna show how to write less code but simultaneously improve maintainability and readability of your android code. I was so impressed that I wanted to try myself, how good and how easy it really is. In this tuturial i will only show the benefits of AndroidAnnotations and not how to install it. But don't worry. If you decide to use it (and i'm sure you'll will :) there is no magic on how to install it. In this site you'll get all the information you need: AndroidAnnotations
The sample project
We will endup with something like this bellow to show to you the power and simplicity of AndroidAnnotatios.
MainActivity
Create a simple project and dont change the default names while creating the project. In the folder res>layout>activity_main.xml copy/paste the following code snippet inside of it.
Initializing the components
If you initialize the components in the tradional android way, you would end up with a class like this:package com.treslines.androidannotations;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private TextView title;
private Button button1;
private Button button2;
private Button button3;
private Button button4;
private Button button5;
private Button button6;
private Button button7;
private Button button8;
private Button button9;
private Button button10;
private Button button11;
private Button button12;
private Button button13;
private Button button14;
private Button button15;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
title = (TextView) findViewById(R.id.textView1);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
button5 = (Button) findViewById(R.id.button5);
button6 = (Button) findViewById(R.id.button6);
button7 = (Button) findViewById(R.id.button7);
button8 = (Button) findViewById(R.id.button8);
button9 = (Button) findViewById(R.id.button9);
button10 = (Button) findViewById(R.id.button10);
button11 = (Button) findViewById(R.id.button11);
button12 = (Button) findViewById(R.id.button12);
button13 = (Button) findViewById(R.id.button13);
button14 = (Button) findViewById(R.id.button14);
button15 = (Button) findViewById(R.id.button15);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);
button4.setOnClickListener(this);
button5.setOnClickListener(this);
button6.setOnClickListener(this);
button7.setOnClickListener(this);
button8.setOnClickListener(this);
button9.setOnClickListener(this);
button10.setOnClickListener(this);
button11.setOnClickListener(this);
button12.setOnClickListener(this);
button13.setOnClickListener(this);
button14.setOnClickListener(this);
button15.setOnClickListener(this);
}
@Override
public void onClick(View view) {
final int id = view.getId();
switch (id) {
case R.id.button1:
handleClick();
break;
case R.id.button2:
handleClick();
break;
case R.id.button3:
handleClick();
break;
case R.id.button4:
handleClick();
break;
case R.id.button5:
handleClick();
break;
case R.id.button6:
handleClick();
break;
case R.id.button7:
handleClick();
break;
case R.id.button8:
handleClick();
break;
case R.id.button9:
handleClick();
break;
case R.id.button10:
handleClick();
break;
case R.id.button11:
handleClick();
break;
case R.id.button12:
handleClick();
break;
case R.id.button13:
handleClick();
break;
case R.id.button14:
handleClick();
break;
case R.id.button15:
handleClick();
break;
default:
break;
}
}
private void handleClick(){
Toast.makeText(this, "AndroidAnnotations are cool!", Toast.LENGTH_SHORT).show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
The benefits of AndroidAnnotations
If you do the same thing with AndroidAnnotations we endup with something soooooo coooool like this ;)package com.treslines.withandroidannotations;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.googlecode.androidannotations.annotations.Click;
import com.googlecode.androidannotations.annotations.EActivity;
import com.googlecode.androidannotations.annotations.ViewById;
@EActivity(R.layout.activity_main)
public class MainActivity extends Activity {
@ViewById(R.id.textView1) protected TextView title;
@ViewById(R.id.button1) protected Button button1;
@ViewById(R.id.button2) protected Button button2;
@ViewById(R.id.button3) protected Button button3;
@ViewById(R.id.button4) protected Button button4;
@ViewById(R.id.button5) protected Button button5;
@ViewById(R.id.button6) protected Button button6;
@ViewById(R.id.button7) protected Button button7;
@ViewById(R.id.button8) protected Button button8;
@ViewById(R.id.button9) protected Button button9;
@ViewById(R.id.button10) protected Button button10;
@ViewById(R.id.button11) protected Button button11;
@ViewById(R.id.button12) protected Button button12;
@ViewById(R.id.button13) protected Button button13;
@ViewById(R.id.button14) protected Button button14;
@ViewById(R.id.button15) protected Button button15;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// NO NEED TO INITIALIZE COMPONENTS ANYMORE
// ONLY 62 LINES AGAINST 139 LINES (2 TIMES LESS CODE)
// LESS COPY/PASTE ERROR
}
// No switch-cases anymore...
// Handle clicks together or independently ...
// No need to implement onClickListener anymore...
@Click({R.id.button1,R.id.button2,R.id.button3}) void onButton1Clicked() {handleClick();};
@Click({R.id.button4,R.id.button5,R.id.button6}) void onButton4Clicked() {handleClick();};
@Click({R.id.button7,R.id.button8,R.id.button9}) void onButton7Clicked() {handleClick();};
@Click({R.id.button10,R.id.button11,R.id.button12}) void onButton10Clicked() {handleClick();};
@Click(R.id.button13) void onButton13Clicked() {handleClick();};
@Click(R.id.button14) void onButton14Clicked() {handleClick();};
@Click(R.id.button15) void onButton15Clicked() {handleClick();};
private void handleClick(){
Toast.makeText(this, "AndroidAnnotations are cool!", Toast.LENGTH_SHORT).show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
That's all. Hope you like it.
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