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View OnClickListener Interface
Using Android Studio 1.4
1) Create New Project
Application Name: MyOnClickListener1
Select API 14:Android 4.0 (IceCreamSandwich)
Follow the wizard to create New Blank Activity.
2) Edit res/layout/content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main"
tools:context=".MainActivity">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/changingTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Hello"
android:textSize="26px"
android:gravity="center_horizontal"
android:textColor="#23cf34" />
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="@+id/leftButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="50dp"
android:layout_marginTop="50dp"
android:text="Left"
/>
<Button
android:id="@+id/rightButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="50dp"
android:layout_marginTop="50dp"
android:text="Right"
/>
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
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OUTCOME.
3) Edit MainActivity.java
package com.notarazi.myonclicklistener1;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
// Declare UI elements
private TextView changingTextView;
private Button firstButton;
private Button secondButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setButons();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
private void setButons() {
// Initialize the UI components
changingTextView = (TextView) findViewById(R.id.changingTextView);
firstButton = (Button) findViewById(R.id.leftButton);
// When we creating a button and if we expect that to use for event handling we have to set the listener
firstButton.setOnClickListener(this);
secondButton = (Button) findViewById(R.id.rightButton);
secondButton.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
// Have to implement with the OnClickListner
// onClick is called when a view has been clicked.
@Override
public void onClick(View v) {
// getId() returns this view's identifier.
if(v.getId() == R.id.leftButton){
// setText() sets the string value of the TextView
changingTextView.setText("You clicked Left");
}else if(v.getId() == R.id.rightButton){
changingTextView.setText("You clicked Right");
}
}
}
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OUTCOME.
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