[Android项目视频教程]通讯录的开发源码视频讲解

package com.zhengping.contact; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.view.Gravity; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnKeyListener; import android.widget.AdapterView; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.RelativeLayout; import android.widget.SimpleAdapter; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.AdapterView.OnItemSelectedListener; import com.zhengping.contact.db.DBHelper; import com.zhengping.contact.entity.User; public class Main extends Activity { //显示所有数据的ListView ListView lv; ArrayList list; //拥有所有数据的Adapter SimpleAdapter adapter; //屏幕下方的工具栏 GridView bottomMenuGrid; //主菜单的布局 GridView mainMenuGrid; //主菜单的视图 View mainMenuView; //登录的视图 View loginView; //装搜索框的linearlayout,默认情况下visibility=gone LinearLayout searchLinearout; LinearLayout mainLinearLayout; //搜索框 EditText et_search; EditText et_enter_file_name; //主菜单的对话框 AlertDialog mainMenuDialog; //确认对话框 AlertDialog confirmDialog; //进度条对话框 AlertDialog progressDialog; //输入文件名的对话框 AlertDialog enterFileNameDialog; //输入用户名密码的对话框 AlertDialog loginDialog; //表示保密状态 boolean privacy = false; //存储标记的数目 int markedNum; //存储标记条目的_id号 ArrayList<Integer> deleteId; // 菜单文字 String[] main_menu_itemName = { "显示所有", "删除所有", "备份数据", "还原数据", "更新", "后退"}; //主菜单图片 int[] main_menu_itemSource = { R.drawable.showall, R.drawable.menu_delete, R.drawable.menu_backup, R.drawable.menu_restore, R.drawable.menu_fresh, R.drawable.menu_return}; String[] bottom_menu_itemName = { "增加", "查找", "删除", "菜单","退出" }; String fileName; int[] bottom_menu_itemSource = { R.drawable.menu_new_user, R.drawable.menu_search, R.drawable.menu_delete, R.drawable.controlbar_showtype_list, R.drawable.menu_exit }; /** * onCreate做的工作就是把listView显示出来 * bottomMenuGrid，mainMenuGrid，searchLinearout都是到要用 * 的时候再初始化，并且只初始化一次 */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mainLinearLayout = (LinearLayout)findViewById(R.id.list_ll); DBHelper helper = new DBHelper(this);//获得所有用户的list helper.openDatabase(); //打开数据库，就打开这一次，因为Helper中的SQLiteDatabase是静态的。 list = helper.getAllUser(privacy);//拿到所有保密状态为privacy的用户的list lv = (ListView)findViewById(R.id.lv_userlist); //创建ListView对象 if(list.size() == 0) { Drawable nodata_bg = getResources().getDrawable(R.drawable.nodata_bg); mainLinearLayout.setBackgroundDrawable(nodata_bg); setTitle("没有查到任何数据"); } //将数据与adapter集合起来 adapter = new SimpleAdapter(this, list, R.layout.listitem, new String[]{"imageid","name","mobilephone"}, new int[]{R.id.user_image,R.id.tv_name,R.id.tv_mobilephone}); lv.setAdapter(adapter);//将整合好的adapter交给listview，显示给用户看 lv.setOnItemClickListener(new OnItemClickListener() { /** * 响应单击事件，单点击某一个选项的时候，跳转到用户详细信息页面 */ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { HashMap item = (HashMap)arg0.getItemAtPosition(arg2); int _id = Integer.parseInt(String.valueOf(item.get("_id"))); Intent intent = new Intent(Main.this,UserDetail.class); User user = new User(); user._id = Integer.parseInt(String.valueOf(item.get("_id"))); user.address = String.valueOf(item.get("address")); user.company = String.valueOf(item.get("company")); user.email = String.valueOf(item.get("email")); user.familyPhone = String.valueOf(item.get("familyphone")); user.mobilePhone = String.valueOf(item.get("mobilephone")); user.officePhone = String.valueOf(item.get("officephone")); user.otherContact = String.valueOf(item.get("othercontact")); user.position = String.valueOf(item.get("position")); user.remark = String.valueOf(item.get("remark")); user.username = String.valueOf(item.get("name")); user.zipCode = String.valueOf(item.get("zipcode")); user.imageId = Integer.parseInt(String.valueOf(item.get("imageid"))); intent.putExtra("user", user); if(searchLinearout != null && searchLinearout.getVisibility()==View.VISIBLE) { searchLinearout.setVisibility(View.GONE); } /*将arg2作为请求码传过去 用于标识修改项的位置*/ startActivityForResult(intent, arg2); } }); lv.setCacheColorHint(Color.TRANSPARENT); //设置ListView的背景为透明 lv.setOnItemLongClickListener(new OnItemLongClickListener(){ @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { if(deleteId == null) { deleteId = new ArrayList<Integer>(); } HashMap item = (HashMap)arg0.getItemAtPosition(arg2); Integer _id = Integer.parseInt(String.valueOf(item.get("_id"))); RelativeLayout r = (RelativeLayout)arg1; ImageView markedView = (ImageView)r.getChildAt(2); if(markedView.getVisibility() == View.VISIBLE) { markedView.setVisibility(View.GONE); deleteId.remove(_id); } else { markedView.setVisibility(View.VISIBLE); deleteId.add(_id); } return true; } }); //为list添加item选择器 Drawable bgDrawable = getResources().getDrawable(R.drawable.list_bg); lv.setSelector(bgDrawable); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); //清除deleteId的内容 if(deleteId != null) { deleteId.clear(); } //当resultCode==3时代表添加了一个用户返回，当resultCode==4的时候代表修改了用户，或者删除了用户，其他条件代表数据没有变化 if(resultCode == 3 || resultCode == 4) { DBHelper helper = new DBHelper(this); list = helper.getAllUser(privacy); adapter = new SimpleAdapter( this, list, R.layout.listitem, new String[]{"imageid","name","mobilephone"}, new int[]{R.id.user_image,R.id.tv_name,R.id.tv_mobilephone}); if(list.size() > 0){ mainLinearLayout.setBackgroundDrawable(null); } } lv.setAdapter(adapter); //将整合好的adapter交给listview，显示给用户看 /** * resultCode只有3、4、5 * 当等于4或者5的时候，代表由UserDetail转过来的。在转想UserDetail的时候，requestCode的值设置的是选中项的位置 */ if(resultCode == 3) { lv.setSelection(list.size()); } else { lv.setSelection(requestCode); } } /** * 响应点击Menu按钮时的事件，用于设置底部菜单是否可见 */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_MENU) { loadBottomMenu(); if(bottomMenuGrid.getVisibility() == View.VISIBLE) { if(searchLinearout != null && searchLinearout.getVisib