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
        }
    }
}