[Android]组件之进度条2

 

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>

 

testAlertDialog.java

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) { 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