本文实例介绍一下PopupWindow对话框。PopupWindow是阻塞对话框,只有在外部线程 或者 PopupWindow本身做退出操作才可以执行。PopupWindow完全依赖Layout做外观,在常见的开发中,PopupWindow应该会与AlertDialog常混用。
先贴出本例中运行的结果图:
main.xml的源码如下:
<?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:layout_width=\"fill_parent\" android:text=\"PopupWindow演示\"></Button> </LinearLayout>
下图所示是PopupWindow弹出的截图,这里的PopupWindow是个登录框,点“确定”则自动填写,点“取消”则关闭PopupWindow。
popupwindow.xml的源码如下:
<?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\" android:background=\"#000000\"> <TextView android:id=\"@+id/username_view\" android:layout_height=\"wrap_content\" android:layout_marginLeft=\"20dip\" android:layout_marginRight=\"20dip\" android:text=\"用户名\" android:textAppearance=\"?android:attr/textAppearanceMedium\" android:layout_width=\"fill_parent\"/> <EditText android:id=\"@+id/username_edit\" android:layout_height=\"wrap_content\" android:layout_width=\"fill_parent\" android:layout_marginLeft=\"20dip\" android:layout_marginRight=\"20dip\" android:capitalize=\"none\" android:textAppearance=\"?android:attr/textAppearanceMedium\" /> <TextView android:id=\"@+id/password_view\" android:layout_height=\"wrap_content\" android:layout_marginLeft=\"20dip\" android:layout_marginRight=\"20dip\" android:text=\"密码\" android:textAppearance=\"?android:attr/textAppearanceMedium\" android:layout_width=\"fill_parent\"/> <EditText android:id=\"@+id/password_edit\" android:layout_height=\"wrap_content\" android:layout_width=\"fill_parent\" android:layout_marginLeft=\"20dip\" android:layout_marginRight=\"20dip\" android:capitalize=\"none\" android:password=\"true\" android:textAppearance=\"?android:attr/textAppearanceMedium\" /> <LinearLayout android:id=\"@+id/LinearLayout01\" android:layout_height=\"wrap_content\" android:layout_width=\"fill_parent\" android:gravity=\"center\"><Button android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:id=\"@+id/BtnOK\" android:layout_weight=\"100\" android:text=\"确定\"></Button><Button android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:layout_weight=\"100\" android:text=\"取消\" android:id=\"@+id/BtnCancel\"></Button></LinearLayout> </LinearLayout>
接下来是Java程序源码:
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.text.Editable; 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 btnPopupWindow; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //定义按钮 btnPopupWindow=(Button)this.findViewById(R.id.Button01); btnPopupWindow.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==btnPopupWindow) { showPopupWindow(testAlertDialog.this, testAlertDialog.this.findViewById(R.id.Button01)); } } } public void showPopupWindow(Context context,View parent){ LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); final View vPopupWindow=inflater.inflate(R.layout.popupwindow, null, false); final PopupWindow pw= new PopupWindow(vPopupWindow,300,300,true); //OK按钮及其处理事件 Button btnOK=(Button)vPopupWindow.findViewById(R.id.BtnOK); btnOK.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { //设置文本框内容 EditText edtUsername=(EditText)vPopupWindow.findViewById(R.id.username_edit); edtUsername.setText(\"username\"); EditText edtPassword=(EditText)vPopupWindow.findViewById(R.id.password_edit); edtPassword.setText(\"password\"); } }); //Cancel按钮及其处理事件 Button btnCancel=(Button)vPopupWindow.findViewById(R.id.BtnCancel); btnCancel.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { pw.dismiss();//关闭 } }); //显示popupWindow对话框 pw.showAtLocation(parent, Gravity.CENTER, 0, 0); } }
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