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