Android入门第九篇之AlertDialog

时隔一年，又要准备做Android的开发了，最近复习和整理一下Android的知识。这次要说的是AlertDialog，这种对话框会经常遇到。AlertDialog跟WIN32开发中的Dialog不一样，AlertDialog是非阻塞的，而阻塞的对话框用的是PopupWindow。

main.xml的源码：

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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:orientation = "vertical"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
>
< Button android:id = "@+id/Button01" android:layout_height = "wrap_content" android:text = "非Layout型对话框" android:layout_width = "fill_parent" > </ Button >
< Button android:id = "@+id/Button02" android:layout_height = "wrap_content" android:text = "Layout型对话框" android:layout_width = "fill_parent" > </ Button > < View android:id = "@+id/View01" android:layout_width = "wrap_content" android:layout_height = "wrap_content" > </ View >
</ LinearLayout >

下图是非Layout型对话框，直接使用AlertDialog

下图是使用了Layout的对话框，可以自定义控件，实现更复杂的对话框

dialoglayout.xml的源码：

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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "fill_parent" android:layout_height = "wrap_content"
android:orientation = "vertical" >
< EditText android:layout_height = "wrap_content"
android:layout_width = "fill_parent" android:layout_marginLeft = "20dip"
android:layout_marginRight = "20dip" android:textAppearance = "?android:attr/textAppearanceMedium" android:id = "@+id/edtInput" />
</ LinearLayout >

程序源码：

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package com.testAlertDialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupWindow;
public class testAlertDialog extends Activity{
ButtonbtnShowDialog;
ButtonbtnShowDialog_Layout;
/**Calledwhentheactivityisfirstcreated.*/
@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
//定义按钮
btnShowDialog=(Button)this .findViewById(R.id.Button01);
btnShowDialog.setOnClickListener(new ClickEvent());
btnShowDialog_Layout=(Button)this .findViewById(R.id.Button02);
btnShowDialog_Layout.setOnClickListener(new ClickEvent());
}
//统一处理按键事件
class ClickEvent implements OnClickListener{
@Override
public void onClick(Viewv){
//TODOAuto-generatedmethodstub
if (v==btnShowDialog)
showDialog(testAlertDialog.this );
else if (v==btnShowDialog_Layout)
showDialog_Layout(testAlertDialog.this );
}
}
//显示基本的AlertDialog
private void showDialog(Contextcontext){
AlertDialog.Builderbuilder=new AlertDialog.Builder(context);
builder.setIcon(R.drawable.icon);
builder.setTitle("Title" );
builder.setMessage("Message" );
builder.setPositiveButton("Button1" ,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterfacedialog, int whichButton){
setTitle("点击了对话框上的Button1" );
}
});
builder.setNeutralButton("Button2" ,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterfacedialog, int whichButton){
setTitle("点击了对话框上的Button2" );
}
});
builder.setNegativeButton("Button3" ,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterfacedialog, int whichButton){
setTitle("点击了对话框上的Button3" );
}
});
builder.show();
}
//显示基于Layout的AlertDialog
private void showDialog_Layout(Contextcontext){
LayoutInflaterinflater=LayoutInflater.from(this );
final ViewtextEntryView=inflater.inflate(
R.layout.dialoglayout,null );
final EditTextedtInput=(EditText)textEntryView.findViewById(R.id.edtInput);
final AlertDialog.Builderbuilder= new AlertDialog.Builder(context);
builder.setCancelable(false );
builder.setIcon(R.drawable.icon);
builder.setTitle("Title" );
builder.setView(textEntryView);
builder.setPositiveButton("确认" ,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterfacedialog, int whichButton){
setTitle(edtInput.getText());
}
});
builder.setNegativeButton("取消" ,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterfacedialog, int whichButton){
setTitle("" );
}
});
builder.show();
}
}

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