76.s1-模仿用户设置密码(对话框的逻辑)

首先有2个对话框，没有设置过密码，需要设置dialog_set_password.xml，用户设置过密码，不需要设置，直接输入密码dialog_input_password.xml，

设置对话框dialog_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:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:textColor="@color/black" android:textSize="20sp" android:background="#66ff00" android:text="设置密码" android:padding="10dp" /> <EditText android:id="@+id/et_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textPassword" android:hint="请输入密码" /> <EditText android:id="@+id/et_password_confirm" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textPassword" android:hint="请再次输入密码" /> <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_cancle" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="取消" /> </LinearLayout> </LinearLayout>

输入对话框dialog_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:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:textColor="@color/black" android:textSize="20sp" android:background="#66ff00" android:text="输入密码" android:padding="10dp" /> <EditText android:id="@+id/et_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textPassword" android:hint="请输入密码" /> <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_cancle" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="取消" /> </LinearLayout> </LinearLayout>

listView页面布局文件，布局主页面home_list_item.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:orientation="vertical" > <ImageView android:id="@+id/iv_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/app" /> <TextView android:id="@+id/tv_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="手机卫士" android:textColor="@color/black" android:layout_marginTop="5dp" android:textSize="18sp" /> </LinearLayout>

主页面的布局文件，显示主页面，结合上面的lit_item_activity.mxl

<?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:orientation="vertical" > <TextView style="@style/TitleStyle" android:text="手机管家" /> <com.ldw.safe.view.FocusedTextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="@color/black" android:text="简书是一个优质的创作社区,在这里,你可以任性地创作,一篇短文、一张照片、一首诗、一幅画……我们相信,每个人都是生活中的艺术家,有着无穷的创造力" android:singleLine="true" android:ellipsize="marquee" android:layout_marginTop="3dp" android:layout_marginBottom="3dp" android:textSize="18sp" /> <GridView android:id="@+id/gv_home" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:verticalSpacing="10dp" android:numColumns="3" ></GridView> </LinearLayout>

业务逻辑并实现md5加密

package com.ldw.safe.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.ldw.safe.R; import com.ldw.safe.utils.MD5Utils; public class HomeActivity extends Activity{ private GridView gv_home; 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.safe, R.drawable.callmsgsafe, R.drawable.app, R.drawable.taskmanager, R.drawable.netmanager, R.drawable.sysoptimize, R.drawable.trojan, R.drawable.atools, R.drawable.settings}; private SharedPreferences mPref; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); mPref = getSharedPreferences("config", MODE_PRIVATE); gv_home = (GridView) findViewById(R.id.gv_home); gv_home.setAdapter(new HomeAdapter()); //监听gridview点击事件 gv_home.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; } } }); } /* * 显示密码的弹窗 */ protected void showPasswordDialog(){ //判断是否设置密码 String savePassword = mPref.getString("password", null); if(!TextUtils.isEmpty(savePassword)){ //输入密码的弹窗 showPasswordInputDialog(); }else{ //如果没有设置过，弹出密码设置的弹窗 showPasswordSetDialog(); } } /* * 输入密码框，设置过密码只需要登陆 */ protected void showPasswordInputDialog(){ AlertDialog.Builder builder = new AlertDialog.Builder(this); final AlertDialog dialog = builder.create(); View view = View.inflate(this, R.layout.dialog_input_password, null); //dialog.setView(view);//自定义的view设置到dialog dialog.setView(view, 0, 0, 0, 0);//设置边距为0，兼容android2.3 final EditText etPassword = (EditText) view.findViewById(R.id.et_password); //获取2个按键 Button btnOk = (Button)view.findViewById(R.id.btn_ok); Button btnCancle = (Button)view.findViewById(R.id.btn_cancle); //监听ok按键 btnOk.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { String password = etPassword.getText().toString(); if(!TextUtils.isEmpty(password)){ String savePassword = mPref.getString("password", null); if(MD5Utils.encode(password).equals(savePassword)){ Toast.makeText(HomeActivity.this, "登陆成功", Toast.LENGTH_SHORT).show(); //对话框消失 dialog.dismiss(); //跳转到手机防盗界面 startActivity(new Intent(HomeActivity.this, LostAndFind.class)); }else{ Toast.makeText(HomeActivity.this, "登陆失败", Toast.LENGTH_SHORT).show(); } }else{ Toast.makeText(HomeActivity.this, "输入框不能是空的", Toast.LENGTH_SHORT).show(); } } }); //监听取消按键 btnCancle.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { dialog.dismiss(); } }); dialog.show(); } /* * 设置密码的弹窗,以前没有设置密码 */ protected void showPasswordSetDialog(){ AlertDialog.Builder builder = new AlertDialog.Builder(this); final AlertDialog dialog = builder.create(); View view = View.inflate(this, R.layout.dialog_set_password, null); //dialog.setView(view);//自定义的view设置到dialog dialog.setView(view, 0, 0, 0, 0);//设置边距为0，兼容android2.3 final EditText etPassword = (EditText) view.findViewById(R.id.et_password); final EditText etPasswordConfirm = (EditText) view.findViewById(R.id.et_password_confirm); //获取2个按键 Button btnOk = (Button)view.findViewById(R.id.btn_ok); Button btnCancle = (Button)view.findViewById(R.id.btn_cancle); //监听ok按键 btnOk.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { String password = etPassword.getText().toString(); String passwordConfirm = etPasswordConfirm.getText().toString(); //TextUtils.isEmpty(password)判断password是不是空，可以避免都是空格 if(!TextUtils.isEmpty(password) && !passwordConfirm.isEmpty()){ if(password.equals(passwordConfirm)){ Toast.makeText(HomeActivity.this, "登陆成功", Toast.LENGTH_SHORT).show(); //保存密码到mPref mPref.edit().putString("password", MD5Utils.encode(password)).commit(); //对话框消失 dialog.dismiss(); //跳转到手机防盗界面 startActivity(new Intent(HomeActivity.this, LostAndFind.class)); }else{ Toast.makeText(HomeActivity.this, "两次密码不一致", Toast.LENGTH_SHORT).show(); } }else{ Toast.makeText(HomeActivity.this, "输入框不能是空的", Toast.LENGTH_SHORT).show(); } } }); //监听取消按键 btnCancle.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { dialog.dismiss(); } }); dialog.show(); } class HomeAdapter extends BaseAdapter{ @Override public int getCount() { // TODO Auto-generated method stub return mItems.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return mItems[position]; } @Override public long getItemId(int position) { // TODO Auto-generated method stub 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 iv_item = (ImageView) view.findViewById(R.id.iv_item); TextView tv_item = (TextView) view.findViewById(R.id.tv_item); iv_item.setImageResource(mPics[position]); tv_item.setText(mItems[position]); return view; } } }

MD5Utils.java

package com.ldw.mobilesafe.utils; import java.io.File; import java.io.FileInputStream; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class MD5Utils { /** * md5加密，md5永远是32位 * * @param password * @return */ public static String encode(String password) { 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，返回字符数组 StringBuffer sb = new StringBuffer(); for (byte b : digest) { int i = b & 0xff;//取字节的低8位有效值 String hexString = Integer.toHexString(i);//将整数转为16进制 if (hexString.length() < 2) { hexString = "0" + hexString;//如果只有1位就补零 } sb.append(hexString); } return sb.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); //没有该算法的时候，抛出异常 } return ""; } /* * 获取到文件的MD5值，文件的特征码 */ public static String getFileMd5(String sourceDir) { try { //创建一个流来读取文件 File file = new File(sourceDir); FileInputStream fis = new FileInputStream(file); byte[] buffer = new byte[1024]; int len = -1; MessageDigest messageDigest = MessageDigest.getInstance("md5"); while((len = fis.read(buffer)) != -1){ //获取到数字摘要 messageDigest.update(buffer, 0, len); } byte[] result = messageDigest.digest(); StringBuffer sb = new StringBuffer(); for (byte b : result) { int i = b & 0xff;//取字节的低8位有效值 String hexString = Integer.toHexString(i);//将整数转为16进制 if (hexString.length() < 2) { hexString = "0" + hexString;//如果只有1位就补零 } sb.append(hexString); } return sb.toString(); } catch (Exception e) { e.printStackTrace(); } return null; } }