Android编程之防止反编译的实现方法

boolean isRunningInEmualtor() {
  boolean qemuKernel = false;
  Process process = null;
  DataOutputStream os = null;
  try{ 
   process = Runtime.getRuntime().exec("getprop ro.kernel.qemu"); 
   os = new DataOutputStream(process.getOutputStream());
   BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(),"GBK"));
   os.writeBytes("exit\n"); 
   os.flush();
   process.waitFor();
   // getprop ro.kernel.qemu == 1 在模拟器
   // getprop ro.product.model == "sdk" 在模拟器
   // getprop ro.build.tags == "test-keys" 在模拟器
   qemuKernel = (Integer.valueOf(in.readLine()) == 1);
   Log.d("com.droider.checkqemu", "检测到模拟器:" + qemuKernel);
  } catch (Exception e){ 
   qemuKernel = false;
   Log.d("com.droider.checkqemu", "run failed" + e.getMessage()); 
  } finally {
   try{ 
    if (os != null) { 
     os.close(); 
    } 
    process.destroy(); 
   } catch (Exception e) {
   } 
   Log.d("com.droider.checkqemu", "run finally"); 
  }
  return qemuKernel;
}

public int getSignature(String packageName) {  
  PackageManager pm = this.getPackageManager();
  PackageInfo pi = null;
  int sig = 0;
  try {
   pi = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
   Signature[] s = pi.signatures;
   sig = s[0].hashCode(); 
  } catch (Exception e1) {
   sig = 0;
   e1.printStackTrace();
  }
  return sig;
}

private String getAppInfo() {
   try {
    String pkName = this.getPackageName();
    String versionName = this.getPackageManager().getPackageInfo(
      pkName, 0).versionName;
    int versionCode = this.getPackageManager()
      .getPackageInfo(pkName, 0).versionCode;
    return pkName + " " + versionName + " " + versionCode;
   } catch (Exception e) {
   }
   return null;
}

private static final char[] wJ = "0123456789abcdef".toCharArray();
public static String imsi = "204046330839890";
public static String p = "0";
public static String keyword = "电话";
public static String tranlateKeyword = "%E7%94%B5%E8%AF%9D";