Android开发--WIFI输入密码Dialog的实现

最终实现效果是点击一个未保存密码的WIFI信号时,弹出如下Dialog:

Android开发--WIFI输入密码Dialog的实现

1、定义Dialog的布局文件:

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
style="@style/DialogStyle">
<EditText
android:id="@+id/wifiDialogPsw"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:password="true"
android:singleLine="true"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="2">
<Button
android:id="@+id/wifiDialogCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="取消"
android:layout_weight="1"/>
<Button
android:id="@+id/wifiDialogCertain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="确定"
android:layout_weight="1"/>
</LinearLayout>
</LinearLayout>
 来自CODE的代码片
WIFI_Dialog.XML

2、定义一个Dialog的子类

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package com.wifi.utils;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.example.controlpcpro.R;
public class WifiPswDialog extends Dialog{
private Button cancelButton;
private Button okButton;
private EditText pswEdit;
private OnCustomDialogListener customDialogListener;
public WifiPswDialog(Context context,OnCustomDialogListener customListener) {
//OnCancelListener cancelListener) {
super(context);
// TODO Auto-generated constructor stub
customDialogListener = customListener;
}
//定义dialog的回调事件
public interface OnCustomDialogListener{
void back(String str);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.wifi_config_dialog);
setTitle("请输入密码");
pswEdit = (EditText)findViewById(R.id.wifiDialogPsw);
cancelButton = (Button)findViewById(R.id.wifiDialogCancel);
okButton = (Button)findViewById(R.id.wifiDialogCertain);
cancelButton.setOnClickListener(buttonDialogListener);
okButton.setOnClickListener(buttonDialogListener);
}
private View.OnClickListener buttonDialogListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
if(view.getId() == R.id.wifiDialogCancel){
pswEdit = null;
customDialogListener.back(null);
cancel();//自动调用dismiss();
}
else{
customDialogListener.back(pswEdit.getText().toString());
dismiss();
}
}
};
}
 来自CODE的代码片
WifiPswDialog

首先说明下Dialog中两个Button的点击事件的处理

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public void onClick(View view) {
// TODO Auto-generated method stub
if(view.getId() == R.id.wifiDialogCancel){
pswEdit = null;
customDialogListener.back(null);
cancel();//自动调用dismiss();
}
else{
customDialogListener.back(pswEdit.getText().toString());
dismiss();
}
}
 来自CODE的代码片
click

对话框关闭时,调用dismiss()方法。点击“取消”时调用cancel()方法,指不再需要执行对话框上的任何功能和动作,取消对话框会自动调用dismiss()方法。

实现从对话框中返回信息,如WIFI密码

Dialog并没有提供可以直接返回数据的方法,我们可以通过创建自己的监听类实现

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//定义dialog的回调事件
public interface OnCustomDialogListener{
void back(String str);
}
 来自CODE的代码片
OnCustomDialogListener
同样Dialog的构造方法也需要改变

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public WifiPswDialog(Context context,OnCustomDialogListener customListener) {
super(context);
// TODO Auto-generated constructor stub
customDialogListener = customListener;
}
 来自CODE的代码片
WifiPswDialog

然后我们需要在创建Dialog时候实现OnCustomDialogListener接口。
Dialog中如何传出数据呢,这是在OnClick方法中传出的。如代码中的语句:
customDialogListener.back(null);
customDialogListener.back(pswEdit.getText().toString());
3、在Acitivity中创建Dialog
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WifiPswDialog pswDialog = new WifiPswDialog(ControlPCMainActivity.this,new OnCustomDialogListener() {
@Override
public void back(String str) {
// TODO Auto-generated method stub
wifiPassword = str;
if(wifiPassword != null){
int netId = localWifiUtils.AddWifiConfig(wifiResultList,wifiItemSSID, wifiPassword);
Log.i("WifiPswDialog",String.valueOf(netId));
if(netId != -1){
localWifiUtils.getConfiguration();//添加了配置信息,要重新得到配置信息
if(localWifiUtils.ConnectWifi(netId)){
selectedItem.setBackgroundResource(R.color.green);
}
}
else{
Toast.makeText(ControlPCMainActivity.this, "网络连接错误", Toast.LENGTH_SHORT).show();
selectedItem.setBackgroundResource(R.color.burlywood);
}
}
else{
selectedItem.setBackgroundResource(R.color.burlywood);
}
}
});
pswDialog.show();
 来自CODE的代码片
snippet_file_0.txt
创建Dialog时最主要的就是对OnCustomDialogListener接口的实现,对back()方法实现,back方法是对话框消失后执行的操作,返回的数据通过back()方法的参数str实现。
创建完成后Dialog的显示只需要通过Dialog.show()方法实现就可以了


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