ANDROID_MARS学习笔记_S01_002View、监听器初步

一、View、监听器介绍

二、在Activity中获取view和设置属性，设置button的监听器

1.activity_main.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:orientation="vertical"
     tools:context="com.tony.androidfirst.MainActivity" >

     <TextView
         android:id="@+id/textView"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:textSize="30sp"
         android:background="#FF0000"
         android:text="Hello android" />

     <Button
         android:id="@+id/button"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="button"/>

 </LinearLayout>

2.MainActivity.java

 package com.tony.androidfirst;

 import android.annotation.SuppressLint;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.TextView;

 @SuppressLint("NewApi")
 public class MainActivity extends ActionBarActivity {

     private TextView textView;
     private Button button;
     int count = 0;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         TextView textView = (TextView) findViewById(R.id.textView);
         textView.setText("Hello View");
         textView.setBackgroundColor(Color.CYAN);

         button = (Button) findViewById(R.id.button);
         ButtonListener buttonListener = new ButtonListener();
         button.setOnClickListener(buttonListener);

     }

     class ButtonListener implements OnClickListener {

         @Override
         public void onClick(View v) {
             count++;
             System.out.println(count);
             //textView.setText(count+"");
         }

     }

3.R.java