（转)android中的alertdialog及LayoutInflater
sgafdsg 2011-02-21
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
