android 获取wifi 密码 代码

 想要获取wifi密码首先要保证你的手机已经root、 因为只有root 以后才能读取存放密码的配置文件

    如果你的手机已经root 用该语句获取 使你的程序获取权限           Process process = Runtime.getRuntime().exec("su");

  下面是  程序的布局

   

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="152dp"        android:text="获取密码" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@+id/button1"        android:layout_centerHorizontal="true"        android:layout_marginBottom="101dp"        android:text=""        android:textAppearance="?android:attr/textAppearanceMedium" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:layout_marginBottom="71dp"        android:text= "退出"/></RelativeLayout>

下面是程序的代码

package com.android.getpsk;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.annotation.SuppressLint;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {Button myButton;Button quit;TextView show;MyHandler myHandler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);myButton = (Button) findViewById(R.id.button1);quit = (Button) findViewById(R.id.button2);show  = (TextView)findViewById(R.id.textView1);myHandler = new MyHandler();myButton.setOnClickListener(new OnClickListener() {        public void onClick(View v)        {              Log.e("Fuck", "I got a key down");           MyThread m = new MyThread();                new Thread(m).start();        }        });quit.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubfinish();}});} @SuppressLint("HandlerLeak")class MyHandler extends Handler {@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);Bundle b = msg.getData();            String info = b.getString("info");            MainActivity.this.show.setText(info);            }  }class MyThread implements Runnable {        public void run() {           ;            StringBuilder content = new StringBuilder();try { Process process = Runtime.getRuntime().exec("su");String cmd = "cat /data/misc/wifi/wpa_supplicant.conf";//String cmd = "id";DataOutputStream dataOutputStream = new DataOutputStream(process.getOutputStream());DataInputStream dataIntputStream = new DataInputStream(process.getInputStream());DataInputStream dataErrorStream = new DataInputStream(process.getErrorStream());dataOutputStream.writeBytes(cmd + "\n");dataOutputStream.flush();Thread.sleep(2000);String line = "";if (dataIntputStream.available() > 0){String error = "";int total = dataIntputStream.available();Log.e("TotalCount", Integer.toString(total));int i = 0;while(i < total){line = dataIntputStream.readLine();if(line.trim().startsWith("ssid=") || line.trim().startsWith("psk=")){content.append(line + "\n");}i += line.length() + 1;}dataOutputStream.close();dataErrorStream.close();dataErrorStream.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();Log.e("Exception1", e.toString());} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();Log.e("Exception2", e.toString());}                                  Message msg = new Message();            Bundle b = new Bundle();// 存放数据            b.putString("info", content.toString());            Log.e("info", content.toString());            msg.setData(b);            MainActivity.this.myHandler.sendMessage(msg); // 向Handler发送消息,更新UI        }    }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

运行结果我就不截图了。我亲测是Ok 的  

转载自http://download.csdn.net/detail/chw_611/5275223