日记本开发

虽然过程很曲折，但也还是跌跌撞撞写出来了

第一次写，代码写的很乱七八糟，不要介意。。这个真的是在练练手，开始奋斗java4android

1.控制listView的代码

package com.my;

import static com.my.MyOpenHelper.DB_NAME;

import java.util.ArrayList;
import java.util.HashMap;

import android.R.color;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;


public class Two extends Activity{
	
	private MyOpenHelper db;
	private String tit;
	private String dat;
	private String con;
	private String wea;
	private int id;
	
	int i=0;
	int  temp[] = new int [2000];
	
	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.index);
		
		ListView list=(ListView)findViewById(R.id.listView);
		
		//注册上下文
		registerForContextMenu(list);
		db = new MyOpenHelper(getApplicationContext(),DB_NAME);
		//动态数组
		ArrayList<HashMap<String,Object>> li=new ArrayList<HashMap<String,Object>>();
		
		Cursor cursor =db.query();
		
		while(cursor.moveToNext()){
			HashMap<String,Object> item = new HashMap<String,Object>();
			temp[i++] = cursor.getInt(cursor.getColumnIndex("d_id"));
			item.put("d_title", cursor.getString(cursor.getColumnIndex("d_title")));
			item.put("d_image", cursor.getString(cursor.getColumnIndex("d_image")));
			item.put("d_data", cursor.getString(cursor.getColumnIndex("d_data")));
			item.put("d_content", cursor.getString(cursor.getColumnIndex("d_content")));
			li.add(item);
		}
		cursor.close();
		
		SimpleAdapter adatper=new SimpleAdapter(Two.this, li, R.layout.list_adapter, 
				new String[]{"d_image","d_title","d_data"},
				new int[]{R.id.item_image,R.id.item_title,R.id.item_data});
		
		list.setAdapter(adatper);
		list.setCacheColorHint(color.transparent);
		
		list.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				//Toast.makeText(Two.this, "你点击了"+arg2+"行", 1000).show();
				// TODO Auto-generated method stub
				//获取选中的日记
				HashMap<String,Object> item = (HashMap<String,Object>) arg0.getItemAtPosition(arg2);
				Intent intent = new Intent(Two.this, Note_read.class);
				
				tit=String.valueOf(item.get("d_title"));
				wea=String.valueOf(item.get("d_image"));
				dat=String.valueOf(item.get("d_data"));
				con=String.valueOf(item.get("d_content"));
				
				intent.putExtra("_ID", temp[arg2]);
				intent.putExtra("TIT", tit);
				intent.putExtra("DAT", dat);
				intent.putExtra("WEA", wea);
				intent.putExtra("CON", con);
				startActivity(intent);
				finish();
			}
			
		});
		
		list.setOnItemLongClickListener(new OnItemLongClickListener() {

			@Override
			public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
					final int arg2, long arg3) {
				// TODO Auto-generated method stub
				new AlertDialog.Builder(Two.this)
					.setPositiveButton("确定", new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
						 
						SQLiteDatabase mdb = db.getWritableDatabase();
						mdb.delete("d_table", "d_id=?", new String [] {temp[arg2]+""});
						mdb.close();
						Toast.makeText(Two.this, "第"+temp[arg2]+"只被撕掉了。。", 1000).show();
						Intent intent = new Intent(Two.this,Two.class);
						startActivity(intent);
						finish();
					}
				}).setNegativeButton("取消", new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
						
					}
				}).setTitle("你删个试试？！").create().show();
				return false;
			}
			
		});
		
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item){
		switch(item.getItemId()){
		case R.id.insertId:
			Intent intent=new Intent(Two.this,WrActivity.class);
			intent.putExtra("cmd", 1);			
			startActivity(intent);
			finish();
			break;
		case R.id.exitId:
			finish();
			android.os.Process.killProcess(android.os.Process.myPid());
		}
		return super.onOptionsItemSelected(item);
	}
}

本来应该要申明一个日记类implements Serializable

但是在Activity之间传递信息的时候出错了...我就直接丢弃了，呵呵

以及在修改删除数据库的时候，提取primary key的方法貌似有点复杂，就直接申明一个数组保存了，也真是醉了。。

2.查看日记.class

package com.my;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class Note_read extends Activity{
	
	public EditText wea;	//天气
	public EditText tit;	//标题
	public EditText cont;	//内容
	public TextView dat;	//日期
	private String d_wea;
	private String d_tit;
	private String d_con;
	private String d_dat;
	private int d_id;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.read);
        
        wea = (EditText)findViewById(R.id.image);
        tit = (EditText)findViewById(R.id.edit_10);
        cont = (EditText)findViewById(R.id.editView2);
        dat = (TextView)findViewById(R.id.editText1);
        
        Button b1 = (Button)findViewById(R.id.queding);
        Button b2 = (Button)findViewById(R.id.quxiao0);
        
        Intent intent = this.getIntent();
        d_id = intent.getExtras().getInt("_ID");
        d_tit = intent.getStringExtra("TIT");
        d_dat = intent.getStringExtra("DAT");
        d_con = intent.getStringExtra("CON");
        d_wea = intent.getStringExtra("WEA");
        
        loadDiaryData();
        
        setEditTextDisable();
        
        b1.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(Note_read.this, WrActivity.class);
				intent.putExtra("t_ID", d_id);
				intent.putExtra("t_TIT", d_tit);
				intent.putExtra("t_DAT", d_dat);
				intent.putExtra("t_WEA", d_wea);
				intent.putExtra("t_CON", d_con);
				intent.putExtra("cmd", 0);
				startActivity(intent);
				finish();
			}
		});
        
        b2.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(Note_read.this,Two.class);
				startActivity(intent);
				finish();
			}
		});
       
    }


    public void setEditTextDisable() {
		// TODO Auto-generated method stub
		wea.setText(d_wea);
		tit.setText(d_tit);
		dat.setText(d_dat);
		cont.setText(d_con);
	}


	public void loadDiaryData() {
		// TODO Auto-generated method stub
		wea.setEnabled(false);
		dat.setEnabled(false);
		cont.setEnabled(false);
		tit.setEnabled(false);
	}


	@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

绑定了写日记的xml

3.写日记.class

package com.my;

import java.text.SimpleDateFormat;
import static com.my.MyOpenHelper.*;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class WrActivity extends Activity{
	
	int status = -1;		
	int id = -1;			
	
	private EditText tianqi;		//天气
	private EditText edit_1;		//标题
	private TextView editView;		//日期
	private EditText editText;		//内容
	
	private int Id;
	private String Tit;
	private String Dat;
	private String Con;
	private String Wea;
	
	MyOpenHelper myHelper;

	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.write);
		
		Button button1=(Button)findViewById(R.id.queding);
		Button button2=(Button)findViewById(R.id.quxiao0);
		tianqi = (EditText)findViewById(R.id.image);
		edit_1 = (EditText) findViewById(R.id.edit_10);
		editView = (TextView)findViewById(R.id.editText1);
		editText = (EditText)findViewById(R.id.editView2);
		
		SimpleDateFormat dataFormat=new SimpleDateFormat("yyyy-MM-dd");
		editView.setText(dataFormat.format(new java.util.Date()));
		
		myHelper = new MyOpenHelper(this, DB_NAME,null,1);
		SQLiteDatabase db = myHelper.getReadableDatabase();
		Intent intent = getIntent();
		Id = intent.getExtras().getInt("t_ID");
        Tit = intent.getStringExtra("t_TIT");
        Dat = intent.getStringExtra("t_DAT");
        Con = intent.getStringExtra("t_CON");
        Wea = intent.getStringExtra("t_WEA");
		status = intent.getExtras().getInt("cmd");		
		
		if(status == 0){
			tianqi.setText(Wea);
			edit_1.setText(Tit);
			editView.setText(Dat);
			editText.setText(Con);
		}
		
		button1.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				
				String a = edit_1.getEditableText().toString().trim();
				String b = editText.getEditableText().toString().trim();
				
				if(a.equals("")||b.equals("")){
					Toast.makeText(WrActivity.this, "请输入标题和内容", 1000).show();
					return ;
				}
				
				switch(status){
				case 0:
					updata();
					break;
				case 1:
					insert();
					break;
				}
				
				Intent intent = new Intent(WrActivity.this,Two.class);
				intent.putExtra("id", MyOpenHelper.DB_NAME.indexOf(id));
				startActivity(intent);
			}
		});
		
		button2.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(WrActivity.this,Two.class);
				startActivity(intent);
			}
		});
		
	}
		
	
	public void updata(){
		SQLiteDatabase db = myHelper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("d_title", edit_1.getText().toString());
		values.put("d_image", tianqi.getText().toString());
		values.put("d_data", editView.getText().toString());
		values.put("d_content",editText.getText().toString());
		db.update("d_table", values, "d_id=?", new String []{Id+""});
		db.close();
	}
		
		public void insert (){
			SQLiteDatabase db = myHelper.getWritableDatabase();
			ContentValues values=new ContentValues();
			values.put("d_title", edit_1.getText().toString());
			values.put("d_image", tianqi.getText().toString());
			values.put("d_data", editView.getText().toString());
			values.put("d_content",editText.getText().toString());
			db.insert("d_table",null,values);
			db.close();
		}
	
}

4.最后是数据库类

package com.my;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class MyOpenHelper extends SQLiteOpenHelper{

	public final static String DB_NAME = "db_name";	
	public final static String TABLE_NAME = "d_table";
	public final static int VERSION=1;				
	public final static String ID = "d_id";			
	public final static String TITLE = "d_title";	
	public final static String CONTENT = "d_content";
	public final static String IMAGE = "d_image";	
	public final static String DATATIME = "d_data";	

	public MyOpenHelper(Context context, String name, CursorFactory factory,
			int version) {	
		super(context, name, factory, version);
		// TODO Auto-generated constructor stub
	}
	
	public MyOpenHelper(Context context, String name) {
		super(context, name,null,VERSION);
		// TODO Auto-generated constructor stub
	}
	
	public MyOpenHelper(Context context, String name,int version) {
		super(context, name, null, version);
		// TODO Auto-generated constructor stub
	}
	
	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub
		db.execSQL("create table d_table(d_id integer primary key autoincrement,d_title text,d_image text,d_data varchar(20),d_content text);");
	}
	
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		// TODO Auto-generated method stub
		System.out.println("updata");
	}
	
	public Cursor query(){
	SQLiteDatabase db = getWritableDatabase();

	Cursor cursor = db.query("d_table", null, null, null, null, null, null);

	return cursor;
	}
}

嗯，代码写的相当的乱，大神看了以后勿喷~