Monday, August 10, 2015

View OnClickListener Interface


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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>
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");
       }
   }
}
OUTCOME.

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