基于Andriod平台的安卓记事本程序源码

package com.notepad.namespace; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.app.AlertDialog; import android.app.ListActivity; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.util.Log; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnCreateContextMenuListener; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.ListView; public class NotepadActivity extends ListActivity implements OnScrollListener { /** Called when the activity is first created. */ //用于表示当前界面是属于哪种状态 public static final int CHECK_STATE = 0; public static final int EDIT_STATE = 1; public static final int ALERT_STATE = 2; private ListView listView; private ListViewAdapter adapter;// 数据源对象 private View RecordView;///列表布局 private View longClickView ;///长按弹出的布局 private Button addRecordButton;//新增 private Button deleteRecordButton;//删除 private Button checkRecordButton;//查看 private Button modifyRecordButton;//修改 private DatabaseManage dm = null;// 数据库管理对象 private Cursor cursor = null; private int id = -1;//被点击的条目 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); RecordView = getLayoutInflater() .inflate(R.layout.footer,null);//获取条目列表的布局 longClickView = getLayoutInflater() .inflate(R.layout.long_click,null); //获取按钮对象 addRecordButton = (Button) RecordView.findViewById(R.id.addRecordButton); deleteRecordButton = (Button) longClickView.findViewById(R.id.deleteRecordButton); checkRecordButton = (Button) longClickView.findViewById(R.id.checkRecordButton); modifyRecordButton = (Button) longClickView.findViewById(R.id.modifyRecordButton); dm = new DatabaseManage(this);//数据库操作对象 listView = getListView();//获取id为list的对象 listView.addFooterView(RecordView);//设置列表底部 视图 initAdapter();//初始化 // this.startManagingCursor(cursor);//将cursor交给Activity管理 setListAdapter(adapter);//自动为id为list的ListView设置适配器 //设置滑动监听器 listView.setOnScrollListener(this); listView.setOnCreateContextMenuListener(new myOnCreateContextMenuListener()); //设置按钮监听器 addRecordButton.setOnClickListener(new AddRecordListener());//新增 deleteRecordButton.setOnClickListener(new DeleteRecordListener());//删除 checkRecordButton.setOnClickListener(new CheckRecordListener());//查看 modifyRecordButton.setOnClickListener(new ModifyRecordListener());//修改 } //初始化数据源 public void initAdapter(){ dm.open();//打开数据库操作对象 cursor = dm.selectAll();//获取所有数据 cursor.moveToFirst();//将游标移动到第一条数据，使用前必须调用 int count = cursor.getCount();//个数 ArrayList<String> items = new ArrayList<String>(); ArrayList<String> times = new ArrayList<String>(); for(int i= 0; i < count; i++){ items.add(cursor.getString(cursor.getColumnIndex("title"))); times.add(cursor.getString(cursor.getColumnIndex("time"))); cursor.moveToNext();//将游标指向下一个 } // cursor.close(); dm.close();//关闭数据操作对象 adapter = new ListViewAdapter(this,items,times);//创建数据源 } @Override protected void onDestroy() {//销毁Activity之前，所做的事 // TODO Auto-generated method stub cursor.close();//关闭游标 super.onDestroy(); } //滑动事件 public void onScrollStateChanged(AbsListView view, int scrollState) { // TODO Auto-generated method stub } public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // TODO Auto-generated method stub } //--------------------------------------------------------------- //长按 public class myOnCreateContextMenuListener implements OnCreateContextMenuListener{ public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // TODO Auto-generated method stub final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; menu.setHeaderTitle(""); //设置选项 menu.add(0,0,0,"删除"); menu.add(0,1,0,"修改"); menu.add(0,2,0,"查看"); } } //响应长按弹出菜单的点击事件 public boolean onContextItemSelected(MenuItem item){ AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo)item .getMenuInfo(); // HashMap<String, Object> map = List.get(menuInfo.position); // Log.v("show", "shibai"); dm.open(); // cursor = dm.selectAll(); switch(item.getItemId()){ case 0://删除 try{ cursor.moveToPosition(menuInfo.position); int i = dm.delete(Long.parseLong(cursor.getString(cursor.getColumnIndex("_id"))));//删除数据 adapter.removeListItem(menuInfo.position);//删除数据 adapter.notifyDataSetChanged();//通知数据源，数据已经改变，刷新界面 // Log.v("show", "chenggong1" + i); }catch(Exception ex){ ex.printStackTrace(); } break; case 1://修改 // Log.v("show", "chenggong2"); try{ cursor.moveToPosition(menuInfo.position); //用于Activity之间的通讯 Intent intent = new Intent(); //通讯时的数据传送 intent.putExtra("id", cursor.getString(cursor.getColumnIndex("_id"))); intent.putExtra("state", ALERT_STATE); intent.putExtra("title", cursor.getString(cursor.getColumnIndex("title"))); intent.putExtra("time", cursor.getString(cursor.getColumnIndex("time"))); intent.putExtra("content", cursor.getString(cursor.getColumnIndex("content"))); //设置并启动另一个指定的Activity intent.setClass(NotepadActivity.this, NotepadEditActivity.class); NotepadActivity.this.startActivity(intent); }catch(Exception ex){ ex.printStackTrace(); } break; case 2://查看 // Log.v("show", "chenggong3"); try{ cursor.moveToPosition(menuInfo.position); Intent intent = new Intent(); intent.putExtra("id", cursor.getString(cursor.getColumnIndex("_id"))); intent.putExtra("title", cursor.getString(cursor.getColumnIndex("title"))); intent.putExtra("time", cursor.getString(cursor.getColumnIndex("time"))); intent.putExtra("content", cursor.getString(cursor.getColumnIndex("content"))); intent.setClass(NotepadActivity.this, NotepadCheckActivity.class); NotepadActivity.this.startActivity(intent); }catch(Exception ex){ ex.printStackTrace(); } break; default:; } // cursor.close(); dm.close(); return super.onContextItemSelected(item); } //短按，即点击 @Override protected void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub super.onListItemClick(l, v, position, id); // Log.v("position", position+""); // Log.v("id", id+""); cursor.moveToPosition(position); Intent intent = new Intent(); intent.putExtra("state", CHECK_STATE); intent.putExtra("id", cursor.getString(cursor.getColumnIndex("_id"))); intent.putExtra("title", cursor.getString(cursor.getColumnIndex("title"))); intent.putExtra("time", cursor.getString(cursor.getColumnIndex("time"))); intent.putExtra("content", cursor.getString(cursor.getColumnIndex("content"))); // cursor.clos