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

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ANDROID_MARS学习笔记_S01_002View、监听器初步

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