Android下按钮的使用方法

2022-07-16 12:10:57

1. package com.hangsheng.button;
2. import android.app.Activity;
3. import android.os.Bundle;
4. import android.view.View;
5. import android.widget.Button;
6. public class Ex07_WidgetButtonActivity extends Activity {
7. /** Called when the activity is first created. */
8. @Override
9. public void onCreate(Bundle savedInstanceState) {
10. super.onCreate(savedInstanceState);
11. setContentView(R.layout.main); //关联布局模板文件main.xml
12. find_and_modify_button(); //调用成员函数find_and_modity_button
13. }
14. private void find_and_modify_button(){
15. Button button =(Button)findViewById(R.id.button); //通过资源内ID为button的资源来实例化button对象
16. button.setOnClickListener(button_listener); //设置对象button的监听器
17. };
18. private Button.OnClickListener button_listener =new Button.OnClickListener(){ //成员按钮监听对象
19. @Override
20. public void onClick(View v) { //按钮事件
21. // TODO Auto-generated method stub
22. setTitle("button被点击了一下");
23. }
24. };
25. }

布局模板文件main.xml:

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是Button" />
</LinearLayout>