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日常分享安卓实训开发-笔记本之主界面
接着上个帖子的登录注册功能完成后，我们接着做登录之后的主界面功能。
里面还包含了一个很低级的数据备份恢复功能，太低级就不单独拿出来做展示。
主界面实现代码
package com.example.notebook;
import java.util.ArrayList;
import java.util.List;
import android.R.color;
import android.R.integer;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class NoteActivity extends Activity {
private Button addbuttton,ckButton,xgButton,cxButton,scButton,bfButton,gyButton;
private ListView noteListView;
private List<Notelist> notelist= new ArrayList<Notelist>();
private Myadapter myAdapter=null;
private int current = 0;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
/*----------------------------------主页显示功能------------------------------------*/
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
mydatabaseHelper.getWritableDatabase();
Cursor result=mydatabaseHelper.findnoteCursor();
Toast.makeText(NoteActivity.this,"共查询到"+String.valueOf(result.getCount())+"条数据", Toast.LENGTH_LONG).show();
noteListView=(ListView)findViewById(R.id.lv_note);
//循环取出数据
for (result.moveToFirst();!result.isAfterLast();result.moveToNext()) {
Notelist notelists= new Notelist(result.getInt(0),result.getString(1),result.getString(2),result.getString(3));
notelist.add(notelists);
}
//绑定适配器
myAdapter = new Myadapter();
noteListView.setAdapter(myAdapter);
//listview项目单击事件监听
noteListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
current=arg2;
myAdapter.notifyDataSetChanged();
}
});
/*----------------------------------备份与恢复图形按钮------------------------------------*/
bfButton=(Button)findViewById(R.id.listview_backup);
bfButton.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// 对话框形式
Dialog dialog=new AlertDialog.Builder(NoteActivity.this)
.setTitle("备份与恢复")
.setMessage("你是要备份还是恢复？")
.setPositiveButton("备份", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
int currentid=notelist.get(current).getId();
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
mydatabaseHelper.backupdelete();
mydatabaseHelper.backup();
Toast.makeText(NoteActivity.this, "备份成功！", Toast.LENGTH_LONG).show();
}
})
.setNegativeButton("恢复", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
mydatabaseHelper.recoverdelete();
mydatabaseHelper.recover();
getallnote();
myAdapter.notifyDataSetChanged();
Toast.makeText(NoteActivity.this, "恢复成功！", Toast.LENGTH_LONG).show();
}
})
.create();
dialog.show();
}
});
/*----------------------------------查看图形按钮------------------------------------*/
ckButton=(Button)findViewById(R.id.listview_cheak);
ckButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Intent邮差，给Activity传递数据
Intent searchIntent =new Intent(NoteActivity.this,CheakActivity.class);
//将当前用户所选项数据传递
Notelist cheakNotelist=new Notelist();
//获取当前所选id数据赋值给cheakNotelist
cheakNotelist=notelist.get(current);
//创建一个Bundle对象
Bundle cheakBundle=new Bundle();
//将数据存储到cheakBundle中，调用Serializable方法
cheakBundle.putSerializable("note", cheakNotelist);
//将Bundle对象传入intent中
searchIntent.putExtras(cheakBundle);
//启动intent
startActivity(searchIntent);
}
});
/*----------------------------------修改图形按钮------------------------------------*/
xgButton=(Button)findViewById(R.id.listview_xiugai);
xgButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent =new Intent(NoteActivity.this,EditActivity.class);
Notelist currentnotelist=new Notelist();
currentnotelist=notelist.get(current);
Bundle bundle=new Bundle();
bundle.putSerializable("note", currentnotelist);
intent.putExtras(bundle);
startActivity(intent);
}
});
/*----------------------------------查询图形按钮------------------------------------*/
cxButton=(Button)findViewById(R.id.listview_chaxun);
cxButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(NoteActivity.this,SearchActivity.class);
startActivity(intent);
}
});
/*----------------------------------删除图形按钮------------------------------------*/
scButton=(Button)findViewById(R.id.listview_shanchu);
scButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Dialog dialog=new AlertDialog.Builder(NoteActivity.this)
.setTitle("删除")
.setMessage("你确定要删除这条记事吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
int currentid=notelist.get(current).getId();
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
mydatabaseHelper.eventdelete(currentid);
Toast.makeText(NoteActivity.this, "删除成功！", Toast.LENGTH_LONG).show();
getallnote();
myAdapter.notifyDataSetChanged();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
})
.create();
dialog.show();
}
});
/*----------------------------------添加图形按钮------------------------------------*/
addbuttton=(Button)findViewById(R.id.listview_btnadd);
addbuttton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(NoteActivity.this,AddnoteActivity.class);
startActivity(intent);
}
});
/*----------------------------------关于图形按钮------------------------------------*/
gyButton=(Button)findViewById(R.id.listview_about);
gyButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(NoteActivity.this,AboutActivity.class);
startActivity(intent);
}
});
}
/*----------------------------------系统菜单功能------------------------------------*/
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0,1,1,"添加");
menu.add(0,2,2,"修改");
menu.add(0,3,3,"删除");
menu.add(0,4,4,"查询");
menu.add(0,5,5,"查看");
return super.onCreateOptionsMenu(menu);
}
/*----------------------------------系统菜单单击事件监听------------------------------------*/
public boolean onOptionsItemSelected(MenuItem item) {
// 菜单选项
switch (item.getItemId()) {
//添加功能
case 1:
Intent intent=new Intent(NoteActivity.this,AddnoteActivity.class);
startActivity(intent);
break;
//修改功能
case 2:
intent =new Intent(NoteActivity.this,EditActivity.class);
Notelist currentnotelist=new Notelist();
currentnotelist=notelist.get(current);
Bundle bundle=new Bundle();
bundle.putSerializable("note", currentnotelist);
intent.putExtras(bundle);
startActivity(intent);
break;
//删除功能
case 3:
Dialog dialog=new AlertDialog.Builder(NoteActivity.this)
.setTitle("删除")
.setMessage("你确定要删除这条记事吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
int currentid=notelist.get(current).getId();
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
mydatabaseHelper.eventdelete(currentid);
Toast.makeText(NoteActivity.this, "删除成功！", Toast.LENGTH_LONG).show();
getallnote();
myAdapter.notifyDataSetChanged();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
})
.create();
dialog.show();
break;
//查询功能
case 4:
Intent searchIntent=new Intent(NoteActivity.this,SearchActivity.class);
startActivity(searchIntent);
break;
//查看功能
case 5:
searchIntent =new Intent(NoteActivity.this,CheakActivity.class);
Notelist cheakNotelist=new Notelist();
cheakNotelist=notelist.get(current);
Bundle cheakBundle=new Bundle();
cheakBundle.putSerializable("note", cheakNotelist);
searchIntent.putExtras(cheakBundle);
startActivity(searchIntent);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
/*----------------------------------用于刷新重新读取数据方法------------------------------------*/
public void getallnote() {
MydatabaseHelper mydatabaseHelper=new MydatabaseHelper(NoteActivity.this);
Cursor noteCursor=mydatabaseHelper.getAllnote();
notelist.clear();
for (noteCursor.moveToFirst();!noteCursor.isAfterLast();noteCursor.moveToNext()) {
Notelist notelists=new Notelist();
notelists.setId(noteCursor.getInt(0));
notelists.setTitleString(noteCursor.getString(1));
notelists.setEventString(noteCursor.getString(2));
notelists.setDateString(noteCursor.getString(3));
notelist.add(notelists);
}
}
/*----------------------------------重启刷新------------------------------------*/
protected void onRestart() {
super.onRestart();
getallnote();
myAdapter.notifyDataSetChanged();
}
/*----------------------------------自定义适配器类------------------------------------*/
class Myadapter extends BaseAdapter{
public int getCount() {
// TODO Auto-generated method stub
return notelist.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return notelist.get(arg0);
}
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
View myView=null;
myView=arg1.inflate(NoteActivity.this, R.layout.activity_note, null);
//如果选择了item显示黄色，未选择显示白色
if (current==arg0) {
myView.setBackgroundColor(Color.YELLOW);
}
else {
myView.setBackgroundColor(Color.WHITE);
}
TextView noteTextView=(TextView)myView.findViewById(R.id.note_notename);
TextView timeTextView=(TextView)myView.findViewById(R.id.note_notetime);
noteTextView.setText(notelist.get(arg0).getTitleString());
timeTextView.setText(notelist.get(arg0).getDateString());
return myView;
}
}
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
return super.onContextItemSelected(item);
}
}
最后于 2020-1-27
被ZAESKY编辑
，原因：
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