Android学习单击事件简单实例

一个简单的需求：

从输入框中输入内容，点击提交按钮后内容将显示在下方的显示区域！



首先建立布局文件activity_main.xml

<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="36dp"
android:ems="10"
android:hint="@string/text_hint" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginLeft="34dp"
android:layout_marginTop="18dp"
android:text="@string/btn" />

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/button1"
android:layout_marginTop="43dp" />

</RelativeLayout>

建立MainActivity.java文件

package com.example.onclickevent;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
private EditText editText=null;
private Button button=null;
private TextView textView=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.editText=(EditText)findViewById(R.id.editText1);
this.textView=(TextView)findViewById(R.id.textView1);
this.button=(Button)findViewById(R.id.button1);
this.button.setOnClickListener(new showText());
}
private class showText implements OnClickListener{
public void onClick(View v) {

String info=MainActivity.this.editText.getText().toString();
MainActivity.this.textView.setText(info);

}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

简单的需求完成，从而也了解了基本的单击事件的处理！