Android學習筆記（七）——顯示對話方塊視窗

標籤：android   對話方塊   layout   adt   alertdialog   

顯示對話方塊視窗

1、建立Dialog1項目，在activity_main.xml檔案中添加一個Button：

<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" >    <Button        android:id="@+id/btn_dialog"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:onClick="onClick"        android:text="Click to display a dialog" /></RelativeLayout>

2、在MainActivity.java檔案中實現建立對話方塊，添加代碼如下：

package com.example.dialog;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.view.Menu;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity {CharSequence[] items = { "Google", "Apple", "Microsoft" };boolean[] itemsChecked = new boolean[items.length];@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@SuppressWarnings("deprecation")public void onClick(View v) {showDialog(0);//點擊按鈕時，顯示對話方塊，此方法接受一個整型參數，用來標識要顯示的特定對話方塊（這裡只建立了標識為0的對話方塊）。}@Override@Deprecated//onCreateDialog()方法是一個用於建立由活動管理的對話方塊的回調方法。當調用showDialog()時，將調用此回調方法。protected Dialog onCreateDialog(int id) {// TODO Auto-generated method stubswitch (id) {case 0://要建立一個對話方塊，需要使用AlertDialog類的Builder建構函式來設定不同的屬性，標、標題、按鈕及複選框等。return new AlertDialog.Builder(this)//調用AlertDialog對象的Builder建構函式。.setIcon(R.drawable.ic_launcher).setTitle("This is a dialog with some simple text...").setPositiveButton("OK",//設定OK按鈕new DialogInterface.OnClickListener() {//設定點擊事件@Overridepublic void onClick(DialogInterface dialog,int which) {// TODO Auto-generated method stubToast.makeText(getBaseContext(),"OK clicked!", Toast.LENGTH_SHORT).show();}}).setNegativeButton("Cancel",//設定Cancel按鈕new DialogInterface.OnClickListener() {//設定點擊事件@Overridepublic void onClick(DialogInterface dialog,int which) {// TODO Auto-generated method stubToast.makeText(getBaseContext(),"Cancel clicked!",Toast.LENGTH_SHORT).show();}}).setMultiChoiceItems(items, itemsChecked,//設定複選框new DialogInterface.OnMultiChoiceClickListener() {//設定點擊事件@Overridepublic void onClick(DialogInterface dialog,int which, boolean isChecked) {// TODO Auto-generated method stubToast.makeText(getBaseContext(),items[which]//通過傳入檢驗是否點擊的參數isChecked來選擇返回的訊息。+ (isChecked ? " checked!": " unchecked!"),Toast.LENGTH_SHORT).show();}}).create();}return null;}@Overridepublic 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;}}

3、運行一下，顯示如：

點擊按鈕：