Android+Sqlite 实现古诗阅读应用（二）

2022-03-07 21:54:16

　　Hi，又回来了，最近接到很多热情洋溢的小伙伴们的来信，吼开心哈，我会继续努力的=-=！

　　上回的东西我们做到了有个textview能随机选择诗来进行显示，这也是我做这个东西的初衷，我想找我到底有哪些古诗没有读过，更想感受一下风吹哪页看哪页的闲适（扯远了=-=！），所以功能现在差不多算是结束了，

不过一个古诗应用这么丑可不行，还有就是，我找到了我要的诗我也得能收藏啊，要是下次忘了可怎么办啊，所以这里面还有一些知识点，我们能从接下来的功能中学到：

1.再做一个启动界面：

　　打开数据库，随着数据库的增大会有一点卡顿，我们加个界面来过渡缓解一下：

 package com.lfk.poem;

 import android.app.Activity;

 import android.content.Intent;

 import android.os.Bundle;

 import android.util.Log;

 import android.view.View;

 import android.view.animation.AlphaAnimation;

 import android.view.animation.Animation;

 /**

  * Created by Administrator on 2015/4/11.

  */

 public class Opening extends Activity {

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         final View view = View.inflate(this, R.layout.activity_opening, null);

         setContentView(view);

         //渐变展示启动屏

         AlphaAnimation start = new AlphaAnimation(0.3f,1.0f);

         start.setDuration();

         view.startAnimation(start);

         start.setAnimationListener(new Animation.AnimationListener()

         {

             @Override

             public void onAnimationEnd(Animation arg0) {

                 Log.e("linc", "---start!");

                 try{

                     Intent intent = new Intent();

                     intent.setClass(Opening.this,MainActivity.class);

                     Opening.this.startActivity(intent);

                     Opening.this.finish();

                 }

                 catch(Exception e)

                 {

                     e.printStackTrace();

                 }

             }

             @Override

             public void onAnimationRepeat(Animation animation) {}

             @Override

             public void onAnimationStart(Animation animation) {}

         });

     }

 }

这是做过的样子：

2.修改Actionbar为透明的叠加模式：

　　这个我在之前的博客里已经写过了，可以参考一下即时通讯的第五篇：http://www.cnblogs.com/lfk-dsk/p/4419418.html

3.数据库的导入：

　　上次为了测试我们只导入了5首古诗作为测试，这回用正则表达式调整了格式，导入了唐诗三百首。

将txt做成了这种格式，然后倒入数据库管理软件。

数据库里的格式就是这样的了，然后替换数据库就好了，想要现成的可找我要。

4.背景和刷新：

　　自然不用说添加自己喜欢的古风背景就好。

　　刷新我不用Button了，改用google的下拉刷新，我在这个博文里写过：http://www.cnblogs.com/lfk-dsk/p/4433319.html

　　每次刷新一下就会重新找一首诗。

5.主活动的修改

 package com.lfk.poem;

 import android.app.Activity;

 import android.content.Intent;

 import android.database.Cursor;

 import android.database.sqlite.SQLiteDatabase;

 import android.graphics.Typeface;

 import android.os.Bundle;

 import android.os.Environment;

 import android.os.Handler;

 import android.support.v4.widget.SwipeRefreshLayout;

 import android.util.Log;

 import android.view.Menu;

 import android.view.MenuInflater;

 import android.view.MenuItem;

 import android.widget.RelativeLayout;

 import android.widget.TextView;

 import android.widget.Toast;

 import java.io.File;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 public class MainActivity extends Activity {

     private  final int BUFFER_SIZE = 400000;

     public static final String DB_NAME = "poem_all.db"; //保存的数据库文件名

     public static final String DB_USER_NAME = "poem_user.db";

     public static final String PACKAGE_NAME = "com.lfk.poem";// 应用的包名

     public static final String DB_PATH = "/data"

             + Environment.getDataDirectory().getAbsolutePath() +"/"

             + PACKAGE_NAME+ "/databases"; // 在手机里存放数据库的位置

     private SwipeRefreshLayout swipeLayout;

     private RelativeLayout main_layout;

     private TextView textView;

     private static int ID = 0;

     private String NAME;

     private String POEM;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");

         textView = (TextView)findViewById(R.id.text_view);

         textView.setTypeface(typeface);

         main_layout = (RelativeLayout)findViewById(R.id.main_layout);

         ChangeBackground();

         FindaPoem();

         swipeLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh);

         swipeLayout.setColorScheme(R.color.haah);

         swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {

             @Override

             public void onRefresh() {

                 new Handler().postDelayed(new Runnable() {//延迟跳转=-=

                     public void run() {

                         swipeLayout.setRefreshing(true);

                         FindaPoem();

                         swipeLayout.setRefreshing(false);

                     }

                 }, 500);

             }

         });

     }

     private void FindaPoem() {

         int ll = (int) (1 + Math.random() * (59170));

         ID = ll;

         SQLiteDatabase database = openDatabase();

         Cursor cursor = database.rawQuery("Select * From poem Where _id = " + ll, null);

         cursor.moveToFirst();

         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);

         NAME = cursor.getString(2)+": "+cursor.getString(1);

         POEM = cursor.getString(13);

         Log.e(poem, "================");

         textView.setText(poem);

         cursor.close();

         database.close();

     }

     private void ChangeBackground(){

         int ln = (int) (1 + Math.random() * (5));

         switch (ln){

             case 1:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.detail_bg));

                 break;

             case 2:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_1));

                 break;

             case 3:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_2));

                 break;

             case 4:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_3));

                 break;

             case 5:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_4));

                 break;

         }

     }

     public SQLiteDatabase openDatabase() {

         try {

             File myDataPath = new File(DB_PATH);

             if (!myDataPath.exists())

             {

                 myDataPath.mkdirs();// 如果没有这个目录,则创建

             }

             String dbfile = myDataPath+"/"+DB_NAME;

             if (!(new File(dbfile).exists())) {// 判断数据库文件是否存在，若不存在则执行导入，否则直接打开数据库

                 InputStream is;

                 is = this.getResources().openRawResource(R.raw.poem_all); // 欲导入的数据库

                 FileOutputStream fos = new FileOutputStream(dbfile);

                 byte[] buffer = new byte[BUFFER_SIZE];

                 int count = 0 ;

                 while ((count = is.read(buffer)) > 0) {

                         fos.write(buffer, 0, count);

                 }

                 fos.close();

                 is.close();

             }

             SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);

             Log.e("=======================","get it  ======================");

             return db;

         } catch (FileNotFoundException e) {

             Log.e("Database", "File not found");

             e.printStackTrace();

         } catch (IOException e) {

             Log.e("Database", "IO exception");

             e.printStackTrace();

         }

         return null;

     }

     void AddaPoemToCollect(){

         File myDataPath = new File(DB_PATH);

         String dbfile = myDataPath+"/"+DB_USER_NAME;

         SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);

         //ContentValues contentValues = new ContentValues();

         db.execSQL("UPDATE poem SET ticai = 1 WHERE _id ="+ID);

         //db.insert("book", null, contentValues);

         db.close();

         Toast.makeText(getApplicationContext(),

                 "Collect succeed",

                 Toast.LENGTH_SHORT).show();

         //ID++;

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         MenuInflater inflater = getMenuInflater();

         inflater.inflate(R.menu.menu_main, menu);

         return super.onCreateOptionsMenu(menu);

     }

     @Override

     public boolean onOptionsItemSelected(MenuItem item) {

         // Handle action bar item clicks here. The action bar will

         // automatically handle clicks on the Home/Up button, so long

         // as you specify a parent activity in AndroidManifest.xml.

         int id = item.getItemId();

         switch(id){

             case R.id.collect:

                 Intent intent = new Intent(this,Collect.class);

                 startActivity(intent);

                 break;

             case R.id.like:

                 AddaPoemToCollect();

                 break;

         }

         return super.onOptionsItemSelected(item);

     }

 }

　　这是修改过的主活动。

　　1.首先更换了字体放在assets文件夹内，在res里面，没有的请新建。

  Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");

         textView = (TextView)findViewById(R.id.text_view);

         textView.setTypeface(typeface);

获取了字体资源，注册了一个textview，把字体设置为textview。

这是修改过的效果，纤细的字体很适合我们的古诗！

     private void ChangeBackground(){

         int ln = (int) (1 + Math.random() * (5));

         switch (ln){

             case 1:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.detail_bg));

                 break;

             case 2:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_1));

                 break;

             case 3:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_2));

                 break;

             case 4:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_3));

                 break;

             case 5:

                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_4));

                 break;

         }

     }

　　添加了一个修改背景的函数，每次进入会随机选择背景，这样我们每次进入就有可能看到不一样的背景了。

     private void FindaPoem() {

         int ll = (int) (1 + Math.random() * (59170));

         ID = ll;

         SQLiteDatabase database = openDatabase();

         Cursor cursor = database.rawQuery("Select * From poem Where _id = " + ll, null);

         cursor.moveToFirst();

         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);

         NAME = cursor.getString(2)+": "+cursor.getString(1);

         POEM = cursor.getString(13);

         Log.e(poem, "================");

         textView.setText(poem);

         cursor.close();

         database.close();

     }

　　从数据库里随即一个数（我数据库里有59170首诗，=-=！）然后打开数据库，找到ID为此项的诗，然后获取诗的内容，getString的号码要按照你自己的数据库需要选择不同的栏位，

比如0位就是ID的栏位，我这里面作者古诗名和古诗内容是分开存放的，而且加入了不少我要用的数据，所以栏位增加到了13个之多，自己做的话只需要三个栏位就好，一个id，一个古诗内容，

一个收藏标记位（用0和1来标记）

　　所以我对dbhelper的数据库生成类进行了一些修改：

 package com.lfk.poem;

 import android.content.Context;

 import android.database.sqlite.SQLiteDatabase;

 import android.database.sqlite.SQLiteOpenHelper;

 import android.widget.Toast;

 /**

  * Created by Administrator on 2015/5/8.

  */

 public class DBhelper extends SQLiteOpenHelper {

     private  static final String CREAT_DB = "create table book ("

             + "id integer primary key autoincrement,"

             + "collect int,"

             + "poem text)";

     private Context mcontext;

     public DBhelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {

         super(context, name, factory, version);

         mcontext = context;

     }

     @Override

     public void onCreate(SQLiteDatabase db) {

         db.execSQL(CREAT_DB);

         Toast.makeText(mcontext,"succeed collect！",Toast.LENGTH_SHORT).show();

     }

     @Override

     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

     }

 }

　　这样生成的数据库就能成功的应用收藏功能了，上一步所说的修改数据库也就能实现了。

6.收藏功能的实现：

　　我在写这篇博文之前曾经写过两次关于收藏的内容，第一次的方法比较蠢，我又开了一个用户的数据库，然后把要收藏的东西复制进用户数据库中，不过这种方法比较麻烦，

首先是开两个数据库增加了系统的无谓开销，增加了对系统资源的消耗，而且在传入新的数据库中，id会发生变化，写入和传值会非常的不便利，所以我放弃了那种方法，改用

在数据库设置标志栏位的方法来解决问题。

 package com.lfk.poem;

 import android.app.Activity;

 import android.content.Intent;

 import android.database.Cursor;

 import android.database.sqlite.SQLiteDatabase;

 import android.os.Bundle;

 import android.os.Environment;

 import android.util.Log;

 import android.view.View;

 import android.widget.AdapterView;

 import android.widget.ArrayAdapter;

 import android.widget.ListView;

 import android.widget.TextView;

 import android.widget.Toast;

 import java.io.File;

 public class Collect extends Activity {

     private DBhelper dBhelper;

     private ListView listView;

     public static ArrayAdapter<String> mArrayAdapter;

     public static final String DB_NAME = "poem_all.db"; //保存的数据库文件名

     public static final String PACKAGE_NAME = "com.lfk.poem";// 应用的包名

     public static final String DB_PATH = "/data"

             + Environment.getDataDirectory().getAbsolutePath() +"/"

             + PACKAGE_NAME+ "/databases"; // 在手机里存放数据库的位置

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_collect);

         String[] data = new String[0];

         //dBhelper = new DBhelper(this,"poem_all.db",null,1);

         listView = (ListView)findViewById(R.id.list_view);

         mArrayAdapter = new ArrayAdapter<String>(this,R.layout.list_item);

         listView.setAdapter(mArrayAdapter);

         FindyourCollect();

         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

             @Override

             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

                                     long arg3) {

                 System.out.println(arg2);

                 String temp = (String)((TextView)arg1).getText();

                 Intent intent = new Intent();

                 intent.putExtra("title",temp);

                 System.out.println(arg2);

                 intent.setClass(Collect.this, Collect_item.class);

                 startActivity(intent);

                 Toast.makeText(getApplicationContext(),

                         "Opening " + arg2,

                         Toast.LENGTH_SHORT).show();

                 mArrayAdapter.notifyDataSetChanged();

             }

         });

     }

 //    @Override

 //    public boolean onCreateOptionsMenu(Menu menu) {

 //        // Inflate the menu; this adds items to the action bar if it is present.

 //        getMenuInflater().inflate(R.menu.menu_collect, menu);

 //        return true;

 //    }

 //

 //    @Override

 //    public boolean onOptionsItemSelected(MenuItem item) {

 //        // Handle action bar item clicks here. The action bar will

 //        // automatically handle clicks on the Home/Up button, so long

 //        // as you specify a parent activity in AndroidManifest.xml.

 //        int id = item.getItemId();

 //

 //        //noinspection SimplifiableIfStatement

 //        if (id == R.id.action_settings) {

 //            return true;

 //        }

 //

 //        return super.onOptionsItemSelected(item);

 //    }

     void FindyourCollect(){

         File myDataPath = new File(DB_PATH);

         String dbfile = myDataPath+"/"+DB_NAME;

         SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(dbfile, null);

         Cursor cursor = database.rawQuery("Select * From poem where ticai = 1", null);

         Log.e("===================", "================");

         if(cursor.moveToFirst()) {

             Log.e("===================", "================");

             do {

                 String title = cursor.getString(cursor.getColumnIndex("mingcheng"));

                 mArrayAdapter.add(title);

                 Log.e(title, "================");

             }while (cursor.moveToNext());

         }

         cursor.close();

         database.close();

     }

     @Override

     protected void onRestart(){

         super.onRestart();

         mArrayAdapter.clear();

         FindyourCollect();

         mArrayAdapter.notifyDataSetChanged();

     }

 }

这是Collect的活动的代码，代码中用了一个系统自带的简易的listview（主要是也不需要太多的功能），进入之后运行FindyourCollect()方法用Select * From poem where ticai = 1语法，

寻找标志位，然后把所有找到的东西加入listview中去，然后设置item的响应打开。

 package com.lfk.poem;

 import android.app.Activity;

 import android.content.Intent;

 import android.database.Cursor;

 import android.database.sqlite.SQLiteDatabase;

 import android.graphics.Typeface;

 import android.os.Bundle;

 import android.util.Log;

 import android.view.Menu;

 import android.view.MenuItem;

 import android.widget.TextView;

 import android.widget.Toast;

 public class Collect_item extends Activity {

     private DBhelper dBhelper;

     private String ID;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_collect_item);

         Intent intent = getIntent();

         String title = intent.getStringExtra("title");

         //System.out.println(id+"=================");

         TextView textView = (TextView)findViewById(R.id.poem_item);

         Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");

         textView.setTypeface(typeface);

         dBhelper = new DBhelper(this,"poem_all.db",null,1);

         SQLiteDatabase database = dBhelper.getWritableDatabase();

         Cursor cursor = database.rawQuery("Select * From poem where mingcheng="+"\""+title+"\"", null);

         cursor.moveToFirst();

         ID = cursor.getString(cursor.getColumnIndex("_id"));

         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);

         textView.setText(poem);

         Log.e("===================", "================");

         cursor.close();

         database.close();

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         getMenuInflater().inflate(R.menu.menu_collect_item, menu);

         return true;

     }

     @Override

     public boolean onOptionsItemSelected(MenuItem item) {

         // Handle action bar item clicks here. The action bar will

         // automatically handle clicks on the Home/Up button, so long

         // as you specify a parent activity in AndroidManifest.xml.

         int id = item.getItemId();

         if(id == R.id.dislike_collect){

             SQLiteDatabase db = dBhelper.getWritableDatabase();

             db.execSQL("UPDATE poem SET ticai = 0 WHERE _id ="+ID);

             db.close();

             Toast.makeText(getApplicationContext(),

                     "Collect Delete",

                     Toast.LENGTH_SHORT).show();

         }

         return super.onOptionsItemSelected(item);

     }

 }

打开后的方法比较简单和主活动基本一样，接受传入的题目，然后根据题目找到我们需要的诗，设置字体然后textview中显示出来。

然后就是加入收藏了，为了方便，我把加入收藏写进了meau中以方便使用：

  void AddaPoemToCollect(){

         //File myDataPath = new File(DB_PATH);

         //String dbfile = myDataPath+"/"+DB_USER_NAME;

         SQLiteDatabase db = openDatabase();

         //ContentValues contentValues = new ContentValues();

         db.execSQL("UPDATE poem SET ticai = 1 WHERE _id ="+ID);

         //db.insert("book", null, contentValues);

         db.close();

         Toast.makeText(getApplicationContext(),

                 "Collect succeed",

                 Toast.LENGTH_SHORT).show();

         //ID++;

     }

     void deleteAPoemFromCollect(){

         SQLiteDatabase db = openDatabase();

         db.execSQL("UPDATE poem SET ticai = 0 WHERE _id ="+ID);

         db.close();

         Toast.makeText(getApplicationContext(),

                 "Collect Delete",

                 Toast.LENGTH_SHORT).show();

     }