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:
<?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>

dialoglayout.xml:
<?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>

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 {
Button btnShowDialog;
Button btnShowDialog_Layout;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
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(View v) {
// TODO Auto-generated method stub
if(v==btnShowDialog)
showDialog(testAlertDialog.this);

else if(v==btnShowDialog_Layout)
showDialog_Layout(testAlertDialog.this);

}

}

//显示基本的AlertDialog
private void showDialog(Context context) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setIcon(R.drawable.icon);
builder.setTitle("Title");
builder.setMessage("Message");
builder.setPositiveButton("Button1",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
setTitle("点击了对话框上的Button1");
}
});
builder.setNeutralButton("Button2",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
setTitle("点击了对话框上的Button2");
}
});
builder.setNegativeButton("Button3",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, 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(Context context) {
LayoutInflater inflater = LayoutInflater.from(this);
final View textEntryView = inflater.inflate(
R.layout.dialoglayout, null);
final EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput);
final AlertDialog.Builder builder = 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(DialogInterface dialog, int whichButton) {
setTitle(edtInput.getText());
}
});
builder.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
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

更多相关文章

随机推荐