Android模仿用户设置密码实例

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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; 
    } 
  } 
}