[Android]組件之進度條2

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這個例子不錯，詳細講解了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型對話方塊" android:layout_width="fill_parent"> </Button> <Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型對話方塊" 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); //定義按鈕 btnShowDialog=(Button)this.findViewById(R.id.Button01); btnShowDialog.setOnClickListener(new ClickEvent()); btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02); btnShowDialog_Layout.setOnClickListener(new ClickEvent()); } //統一處理按鍵事件 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); } } } //顯示基本的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("點擊了對話方塊上的Button1"); } }); builder.setNeutralButton("Button2", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { setTitle("點擊了對話方塊上的Button2"); } }); builder.setNegativeButton("Button3", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { setTitle("點擊了對話方塊上的Button3"); } }); builder.show(); } //顯示基於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("確認", 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(); } }

 

小結下：
1. 對於button，可以學上面這樣，統一的一個事件去處理．

2. 在實際開發種LayoutInflater這個類還是非常有用的,它的作用類似於 findViewById(),
不同點是LayoutInflater是用來找layout下xml布局檔案，並且執行個體化！而findViewById()是找具體xml下的具體 widget控制項(如:Button,TextView等)。

3. 注意這裡AlertDialog.Builder 的用法