button,android:onClick=""

package com.example.upload_img_2;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}//private void display() { ////错误//Toast.makeText(MainActivity.this, "点击", Toast.LENGTH_SHORT).show();//}//private void display(View v) {//错误//Toast.makeText(MainActivity.this, "点击", Toast.LENGTH_SHORT).show();//}public void display(View v) { ////1必须要是public,2必须要带参数View vToast.makeText(MainActivity.this, "点击", Toast.LENGTH_SHORT).show();}}

<RelativeLayout 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"    tools:context="${relativePackage}.${activityClass}" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Button        android:id="@+id/button1"        android:onClick="display"///这是重点        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/textView1"        android:layout_marginTop="58dp"        android:text="Button" /></RelativeLayout>

与通过Button button = (Button)findViewById(....);

button.setOClickLisener....

功能一样

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