android131 360 03 输入密码
package com.itheima52.mobilesafe.activity; import android.app.Activity; import android.app.AlertDialog; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.itheima52.mobilesafe.R; import com.itheima52.mobilesafe.utils.MD5Utils; /** * 主页面 */ public class HomeActivity extends Activity { private GridView gvHome; private String[] mItems = new String[] { "手机防盗", "通讯卫士", "软件管理", "进程管理", "流量统计", "手机杀毒", "缓存清理", "高级工具", "设置中心" }; private int[] mPics = new int[] { R.drawable.home_safe, R.drawable.home_callmsgsafe, R.drawable.home_apps, R.drawable.home_taskmanager, R.drawable.home_netmanager, R.drawable.home_trojan, R.drawable.home_sysoptimize, R.drawable.home_tools, R.drawable.home_settings }; private SharedPreferences mPref; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); mPref = getSharedPreferences("config", MODE_PRIVATE); gvHome = (GridView) findViewById(R.id.gv_home); gvHome.setAdapter(new HomeAdapter()); // 设置监听 gvHome.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view,int position, long id) { switch (position) { case 0: // 手机防盗 showPasswordDialog(); break; case 8: // 设置中心 startActivity(new Intent(HomeActivity.this,SettingActivity.class)); break; default: break; } } }); } /** * 显示密码弹窗 */ protected void showPasswordDialog() { //判断是否设置密码，密码保存在SharedPreferences中，是否自动更新也保存在SharedPreferences中。SharedPreferences是以xml格式保存。 String savedPassword = mPref.getString("password", null);//默认值是null if (!TextUtils.isEmpty(savedPassword)) { // 输入密码弹窗 showPasswordInputDialog(); } else { // 如果没有设置过, 弹出设置密码的弹窗 showPasswordSetDailog(); } } /** * 输入密码弹窗 */ private void showPasswordInputDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); final AlertDialog dialog = builder.create(); View view = View.inflate(this, R.layout.dailog_input_password, null); // dialog.setView(view);// 将自定义的布局文件设置给dialog dialog.setView(view, 0, 0, 0, 0);// 设置边距为0,保证在2.x的版本上运行没问题 final EditText etPassword = (EditText) view.findViewById(R.id.et_password); Button btnOK = (Button) view.findViewById(R.id.btn_ok); Button btnCancel = (Button) view.findViewById(R.id.btn_cancel); btnOK.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String password = etPassword.getText().toString(); if (!TextUtils.isEmpty(password)) { String savedPassword = mPref.getString("password", null); if (MD5Utils.encode(password).equals(savedPassword)) { // Toast.makeText(HomeActivity.this, "登录成功!", // Toast.LENGTH_SHORT).show(); dialog.dismiss(); // 跳转到手机防盗页 startActivity(new Intent(HomeActivity.this, LostFindActivity.class)); } else { Toast.makeText(HomeActivity.this, "密码错误!", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(HomeActivity.this, "输入框内容不能为空!", Toast.LENGTH_SHORT).show(); } } }); btnCancel.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { dialog.dismiss();// 隐藏dialog } }); dialog.show(); } /** * 设置密码的弹窗 */ private void showPasswordSetDailog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); final AlertDialog dialog = builder.create(); View view = View.inflate(this, R.layout.dailog_set_password, null); // dialog.setView(view);// 将自定义的布局文件设置给dialog dialog.setView(view, 0, 0, 0, 0);// 设置边距为0,保证在2.x的版本上运行没问题 final EditText etPassword = (EditText) view .findViewById(R.id.et_password); final EditText etPasswordConfirm = (EditText) view .findViewById(R.id.et_password_confirm); Button btnOK = (Button) view.findViewById(R.id.btn_ok); Button btnCancel = (Button) view.findViewById(R.id.btn_cancel); btnOK.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String password = etPassword.getText().toString(); String passwordConfirm = etPasswordConfirm.getText().toString(); // password!=null && !password.equals("") if (!TextUtils.isEmpty(password) && !passwordConfirm.isEmpty()) { if (password.equals(passwordConfirm)) { // Toast.makeText(HomeActivity.this, "登录成功!", // Toast.LENGTH_SHORT).show(); // 将密码保存起来 mPref.edit() .putString("password", MD5Utils.encode(password)).commit(); dialog.dismiss(); // 跳转到手机防盗页 startActivity(new Intent(HomeActivity.this, LostFindActivity.class)); } else { Toast.makeText(HomeActivity.this, "两次密码不一致!", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(HomeActivity.this, "输入框内容不能为空!", Toast.LENGTH_SHORT).show(); } } }); btnCancel.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { dialog.dismiss();// 隐藏dialog } }); dialog.show(); } class HomeAdapter extends BaseAdapter { @Override public int getCount() { return mItems.length; } @Override public Object getItem(int position) { return mItems[position]; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = View.inflate(HomeActivity.this, R.layout.home_list_item, null); ImageView ivItem = (ImageView) view.findViewById(R.id.iv_item); TextView tvItem = (TextView) view.findViewById(R.id.tv_item); tvItem.setText(mItems[position]); ivItem.setImageResource(mPics[position]); return view; } } }
dailog_set_password.xml
<?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:background="#fff" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#66ff6600" android:gravity="center" android:padding="10dp" android:text="设置密码" android:textColor="@color/black" android:textSize="20sp" /> <EditText android:id="@+id/et_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入密码" android:inputType="textPassword" > </EditText> <EditText android:id="@+id/et_password_confirm" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请再次输入密码" android:inputType="textPassword" > </EditText> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_ok" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="确定" /> <Button android:id="@+id/btn_cancel" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="取消" /> </LinearLayout> </LinearLayout>
dailog_input_password.xml
<?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:background="#fff" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#66ff6600" android:gravity="center" android:padding="10dp" android:text="输入密码" android:textColor="@color/black" android:textSize="20sp" /> <EditText android:id="@+id/et_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入密码" android:inputType="textPassword" > </EditText> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn_ok" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="确定" /> <Button android:id="@+id/btn_cancel" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="取消" /> </LinearLayout> </LinearLayout>
MD5加密：
import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Main { public static void main(String[] args) { String password = "123456"; //MD5只是一个文件或者字符串的特征码。 try { MessageDigest instance = MessageDigest.getInstance("MD5");// 获取MD5算法对象 byte[] digest = instance.digest(password.getBytes());// 对字符串加密,返回加密后的字节数组：[-31, 10, -36, 57, 73, -70, 89, -85, -66, 86, -32, 87, -14, 15, -120, 62] StringBuffer sb = new StringBuffer(); for (byte b : digest) {//-31， int i = b & 0xff;// 获取字节的低八位有效值，0xff = 0000000011111111 String hexString = Integer.toHexString(i);// 将整数转为16进制 // System.out.println(hexString); if (hexString.length() < 2) {// 如果是1位的话,补0 hexString = "0" + hexString; } sb.append(hexString); } System.out.println("md5:" + sb.toString()); System.out.println("md5 length:" + sb.toString().length());//Md5都是32位 } catch (NoSuchAlgorithmException e) { e.printStackTrace(); // 没有该算法时,抛出异常, 不会走到这里 } } }
本文转自农夫山泉别墅博客园博客，原文链接：http://www.cnblogs.com/yaowen/p/5096561.html，如需转载请自行联系原作者
