(转)android中的alertdialog及LayoutInflater

http://blog.csdn.net/hellogv/archive/2010/10/21/5955959.aspx#

这个例子不错,详细讲解了alertdialog及LayoutInflater的用法:

main.xml:

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<Buttonandroid:id="@+id/Button01"android:layout_height="wrap_content"android:text="非Layout型对话框"android:layout_width="fill_parent"></Button>

<Buttonandroid:id="@+id/Button02"android:layout_height="wrap_content"android:text="Layout型对话框"android:layout_width="fill_parent"></Button><Viewandroid:id="@+id/View01"android:layout_width="wrap_content"android:layout_height="wrap_content"></View>

</LinearLayout>

dialoglayout.xml:

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"android:layout_height="wrap_content"

android:orientation="vertical">

<EditTextandroid: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>

packagecom.testAlertDialog;

importandroid.app.Activity;

importandroid.app.AlertDialog;

importandroid.content.Context;

importandroid.content.DialogInterface;

importandroid.os.Bundle;

importandroid.view.Gravity;

importandroid.view.LayoutInflater;

importandroid.view.View;

importandroid.view.View.OnClickListener;

importandroid.widget.Button;

importandroid.widget.EditText;

importandroid.widget.PopupWindow;

publicclasstestAlertDialogextendsActivity{

ButtonbtnShowDialog;

ButtonbtnShowDialog_Layout;

/**Calledwhentheactivityisfirstcreated.*/

@Override

publicvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//定义按钮

btnShowDialog=(Button)this.findViewById(R.id.Button01);

btnShowDialog.setOnClickListener(newClickEvent());

btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);

btnShowDialog_Layout.setOnClickListener(newClickEvent());

}

//统一处理按键事件

classClickEventimplementsOnClickListener{

@Override

publicvoidonClick(Viewv){

//TODOAuto-generatedmethodstub

if(v==btnShowDialog)

showDialog(testAlertDialog.this);

elseif(v==btnShowDialog_Layout)

showDialog_Layout(testAlertDialog.this);

}

}

//显示基本的AlertDialog

privatevoidshowDialog(Contextcontext){

AlertDialog.Builderbuilder=newAlertDialog.Builder(context);

builder.setIcon(R.drawable.icon);

builder.setTitle("Title");

builder.setMessage("Message");

builder.setPositiveButton("Button1",

newDialogInterface.OnClickListener(){

publicvoidonClick(DialogInterfacedialog,intwhichButton){

setTitle("点击了对话框上的Button1");

}

});

builder.setNeutralButton("Button2",

newDialogInterface.OnClickListener(){

publicvoidonClick(DialogInterfacedialog,intwhichButton){

setTitle("点击了对话框上的Button2");

}

});

builder.setNegativeButton("Button3",

newDialogInterface.OnClickListener(){

publicvoidonClick(DialogInterfacedialog,intwhichButton){

setTitle("点击了对话框上的Button3");

}

});

builder.show();

}

//显示基于Layout的AlertDialog

privatevoidshowDialog_Layout(Contextcontext){

LayoutInflaterinflater=LayoutInflater.from(this);

finalViewtextEntryView=inflater.inflate(

R.layout.dialoglayout,null);

finalEditTextedtInput=(EditText)textEntryView.findViewById(R.id.edtInput);

finalAlertDialog.Builderbuilder=newAlertDialog.Builder(context);

builder.setCancelable(false);

builder.setIcon(R.drawable.icon);

builder.setTitle("Title");

builder.setView(textEntryView);

builder.setPositiveButton("确认",

newDialogInterface.OnClickListener(){

publicvoidonClick(DialogInterfacedialog,intwhichButton){

setTitle(edtInput.getText());

}

});

builder.setNegativeButton("取消",

newDialogInterface.OnClickListener(){

publicvoidonClick(DialogInterfacedialog,intwhichButton){

setTitle("");

}

});

builder.show();

}

}

小结下:

1对于button,可以学上面这样,统一的一个事件去处理.

2 在实际开发种LayoutInflater这个类还是非常有用的,它的作用类似于findViewById(),

不同点是LayoutInflater是用来找layout下xml布局文件,并且实例化!而findViewById()是找具体xml下的具体widget控件(如:Button,TextView等)。

3 注意这里AlertDialog.Builder的用法

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