Button

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MainActivity.java

package com.czk.testview;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {private Button btn1=null;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1=(Button)findViewById(R.id.btn1);btn1.setOnClickListener(new OnClickListener() {public void onClick(View v) {// TODO Auto-generated method stubToast.makeText(MainActivity.this, "你按到按钮了", Toast.LENGTH_LONG).show();;}});}}

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:orientation="vertical">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="24sp"        android:text="@string/hello_world"/>    <Button         android:id="@+id/btn1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button"/></LinearLayout>

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