ANDROID_MARS学习笔记_S01_002View监听器初步

Posted 2020-06-13

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

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     android:orientation="vertical"
10     tools:context="com.tony.androidfirst.MainActivity" >
11 
12     <TextView
13         android:id="@+id/textView"
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:textSize="30sp"
17         android:background="#FF0000"
18         android:text="Hello android" />
19     
20     <Button
21         android:id="@+id/button"
22         android:layout_width="match_parent"
23         android:layout_height="wrap_content"
24         android:text="button"/>
25         
26 
27 </LinearLayout>

 

2.MainActivity.java

 1 package com.tony.androidfirst;
 2 
 3 import android.annotation.SuppressLint;
 4 import android.graphics.Color;
 5 import android.os.Bundle;
 6 import android.support.v7.app.ActionBarActivity;
 7 import android.view.Menu;
 8 import android.view.MenuItem;
 9 import android.view.View;
10 import android.view.View.OnClickListener;
11 import android.widget.Button;
12 import android.widget.TextView;
13 
14 
15 @SuppressLint("NewApi")
16 public class MainActivity extends ActionBarActivity {
17 
18     private TextView textView;
19     private Button button;
20     int count = 0;
21     @Override
22     protected void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.activity_main);
25         
26         TextView textView = (TextView) findViewById(R.id.textView);
27         textView.setText("Hello View");
28         textView.setBackgroundColor(Color.CYAN);
29         
30         button = (Button) findViewById(R.id.button);
31         ButtonListener buttonListener = new ButtonListener();
32         button.setOnClickListener(buttonListener);
33 
34     }
35 
36     class ButtonListener implements OnClickListener {
37 
38         @Override
39         public void onClick(View v) {
40             count++;
41             System.out.println(count);
42             //textView.setText(count+"");
43         }
44         
45     }

 

3.R.java