在layout XML檔中設定button, 並在properties欄位中的on click設定呼叫之方法名稱,
此種事件處理為簡化行處理機制,
此範例中設定此方法名稱為toShowToast,
點擊之後取得按鈕text內容並且用toast方塊顯示
MainActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
publicc lass MainActivity extends Activity{
privateButtonbtn;
@Override
protected void onCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.button1);
}
public void to ShowToast(Viewv) // 簡化行處理機制
{
String buttonName=((Button)v).getText().toString();
Toast.makeText(this,buttonName,Toast.LENGTH_LONG).show();
}
}
activity_main.xml
<RelativeLayoutxmlns: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="com.example.buttonclick.MainActivity">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp"
android:onClick="toShowToast"
android:text="helloAndroid"/>
</RelativeLayout>