功能分析

1、通过Runtime.getRuntime().exec(“su”)获取root权限。

2、通过process.getOutputStream()和process.getInputStream()获取终端的输入流和输出流。

3、通过dataOutputStream.writeBytes(“cat /data/misc/wifi/*.conf\n”)往终端中输入命令。注意，这里必须要有\n作为换行，否则会与后一个exit命令作为一个命令，最终导致命令执行失败，无法得到结果。

4、通过dataInputStream获取命令执行结果，并以UTF-8的编码转换成字符串。

5、使用正则表达式过滤出wifi的用户名和密码。

操作步骤

1、新建一个项目。这就不用多说了吧！然后打开MainActivity.java

2、新建一个WiFiManager类

3、然后新建一个WiFiInfo类

新建2个属性 ssid和password分别代表WiFi名称和WiFi密码

4、在WiFiInfo类中加入以下代码

package com.example.honglinchen.wifiviewpassword;
public class WiFiInfo {
/*
 * WiFi 名称
 */
public String ssid="";
/*
 * WiFi 密码
 */
public String password="";
}

欢迎大家来到IT世界,在知识的湖畔探索吧!

5、然后找到res目录下activity_main.xml布局文件

欢迎大家来到IT世界,在知识的湖畔探索吧!<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context="com.example.honglinchen.wifiviewpassword.MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="40dip"
android:background="#66CD00"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textStyle="normal"
android:text="获取已经连接WiFi的密码！"
android:textColor="#ffffff" />
</RelativeLayout>
<ListView
android:id="@+id/WifiInfoView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

6、然后在WiFiManage添加如下代码：

package com.example.honglinchen.wifiviewpassword;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class WifiManage {
public List<WiFiInfo> Read() throws Exception {
List<WiFiInfo> wifiInfos=new ArrayList<WiFiInfo>();
Process process = null;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null;
StringBuffer wifiConf = new StringBuffer();
try {
process = Runtime.getRuntime().exec("su");
dataOutputStream = new DataOutputStream(process.getOutputStream());
dataInputStream = new DataInputStream(process.getInputStream());
dataOutputStream
.writeBytes("cat /data/misc/wifi/*.conf\n");
dataOutputStream.writeBytes("exit\n");
dataOutputStream.flush();
InputStreamReader inputStreamReader = new InputStreamReader(
dataInputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
String line = null;
while ((line = bufferedReader.readLine()) != null) {
wifiConf.append(line);
}
bufferedReader.close();
inputStreamReader.close();
process.waitFor();
} catch (Exception e) {
throw e;
} finally {
try {
if (dataOutputStream != null) {
dataOutputStream.close();
}
if (dataInputStream != null) {
dataInputStream.close();
}
process.destroy();
} catch (Exception e) {
throw e;
}
}
Pattern network = Pattern.compile("network=\\{([^\\}]+)\\}", Pattern.DOTALL);
Matcher networkMatcher = network.matcher(wifiConf.toString() );
while (networkMatcher.find() ) {
String networkBlock = networkMatcher.group();
Pattern ssid = Pattern.compile("ssid=\"([^\"]+)\"");
Matcher ssidMatcher = ssid.matcher(networkBlock);
if (ssidMatcher.find() ) {
WiFiInfo wifiInfo=new WiFiInfo();
wifiInfo.ssid=ssidMatcher.group(1);
Pattern psk = Pattern.compile("psk=\"([^\"]+)\"");
Matcher pskMatcher = psk.matcher(networkBlock);
if (pskMatcher.find() ) {
wifiInfo.password=pskMatcher.group(1);
} else {
wifiInfo.password="无密码";
}
wifiInfos.add(wifiInfo);
}
}
return wifiInfos;
}
}

7、在MainActivity.java中开始编写如下代码：

欢迎大家来到IT世界,在知识的湖畔探索吧!package com.example.honglinchen.wifiviewpassword;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private WifiManage wifiManage;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
wifiManage = new WifiManage();
try {
Init();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void Init() throws Exception {
List<WiFiInfo> wifiInfos = wifiManage.Read();
ListView wifiInfosView=(ListView)findViewById(R.id.WifiInfoView);
WifiAdapter ad = new WifiAdapter(wifiInfos,MainActivity.this);
wifiInfosView.setAdapter(ad);
}
public class WifiAdapter extends BaseAdapter {
List<WiFiInfo> wifiInfo =null;
Context con;
public WifiAdapter(List<WiFiInfo> wifiInfos,Context con){
this.wifiInfo =wifiInfos;
this.con = con;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return wifiInfo.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return wifiInfo.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
convertView = LayoutInflater.from(con).inflate(android.R.layout.simple_list_item_1, null);
TextView tv = (TextView)convertView.findViewById(android.R.id.text1);
tv.setText("Wifi:"+wifiInfo.get(position).ssid+"\n密码:"+wifiInfo.get(position).password);
return convertView;
}
}
}

完功。跑起来看看吧！

如下图：刚写好，测试好，发给大家吧！