Android+Sqlite 實現古詩閱讀應用（二）

時間 2019-12-19

標籤 android+sqlite android sqlite 實現古詩閱讀應用欄目 Android 简体版

原文原文鏈接

　　傳送門：Android+Sqlite 實現古詩閱讀應用（一）html

　　Hi，又回來了，最近接到不少熱情洋溢的小夥伴們的來信，吼開心哈，我會繼續努力的=-=！java

　　上回的東西咱們作到了有個textview能隨機選擇詩來進行顯示，這也是我作這個東西的初衷，我想找我到底有哪些古詩沒有讀過，更想感覺一下風吹哪頁看哪頁的閒適（扯遠了=-=！），因此功能如今差很少算是結束了，android

不過一個古詩應用這麼醜可不行，還有就是，我找到了我要的詩我也得能收藏啊，要是下次忘了可怎麼辦啊，因此這裏面還有一些知識點，咱們能從接下來的功能中學到：正則表達式

1.再作一個啓動界面：

　　打開數據庫，隨着數據庫的增大會有一點卡頓，咱們加個界面來過渡緩解一下：sql

 1 package com.lfk.poem;
 2 import android.app.Activity;
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.util.Log;
 6 import android.view.View;
 7 import android.view.animation.AlphaAnimation;
 8 import android.view.animation.Animation;
 9 
10 /**
11  * Created by Administrator on 2015/4/11.
12  */
13 public class Opening extends Activity {
14     @Override
15     public void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         final View view = View.inflate(this, R.layout.activity_opening, null);
18         setContentView(view);
19         //漸變展現啓動屏
20         AlphaAnimation start = new AlphaAnimation(0.3f,1.0f);
21         start.setDuration(2000);
22         view.startAnimation(start);
23         start.setAnimationListener(new Animation.AnimationListener()
24         {
25             @Override
26             public void onAnimationEnd(Animation arg0) {
27                 Log.e("linc", "---start!");
28                 try{
29                     Intent intent = new Intent();
30                     intent.setClass(Opening.this,MainActivity.class);
31                     Opening.this.startActivity(intent);
32                     Opening.this.finish();
33                 }
34                 catch(Exception e)
35                 {
36                     e.printStackTrace();
37                 }
38             }
39             @Override
40             public void onAnimationRepeat(Animation animation) {}
41             @Override
42             public void onAnimationStart(Animation animation) {}
43         });
44 
45 
46     }
47 }

這是作過的樣子：數據庫

2.修改Actionbar爲透明的疊加模式：

　　這個我在以前的博客裏已經寫過了，能夠參考一下即時通信的第五篇：http://www.cnblogs.com/lfk-dsk/p/4419418.html

3.數據庫的導入：

　　上次爲了測試咱們只導入了5首古詩做爲測試，這回用正則表達式調整了格式，導入了唐詩三百首。app

將txt作成了這種格式，而後倒入數據庫管理軟件。dom

數據庫裏的格式就是這樣的了，而後替換數據庫就行了，想要現成的可找我要。ide

4.背景和刷新：

　　天然不用說添加本身喜歡的古風背景就好。函數

　　刷新我不用Button了，改用google的下拉刷新，我在這個博文裏寫過：http://www.cnblogs.com/lfk-dsk/p/4433319.html

　　每次刷新一下就會從新找一首詩。

5.主活動的修改

  1 package com.lfk.poem;
  2 
  3 import android.app.Activity;
  4 import android.content.Intent;
  5 import android.database.Cursor;
  6 import android.database.sqlite.SQLiteDatabase;
  7 import android.graphics.Typeface;
  8 import android.os.Bundle;
  9 import android.os.Environment;
 10 import android.os.Handler;
 11 import android.support.v4.widget.SwipeRefreshLayout;
 12 import android.util.Log;
 13 import android.view.Menu;
 14 import android.view.MenuInflater;
 15 import android.view.MenuItem;
 16 import android.widget.RelativeLayout;
 17 import android.widget.TextView;
 18 import android.widget.Toast;
 19 
 20 import java.io.File;
 21 import java.io.FileNotFoundException;
 22 import java.io.FileOutputStream;
 23 import java.io.IOException;
 24 import java.io.InputStream;
 25 
 26 
 27 public class MainActivity extends Activity {
 28     private  final int BUFFER_SIZE = 400000;
 29     public static final String DB_NAME = "poem_all.db"; //保存的數據庫文件名
 30     public static final String DB_USER_NAME = "poem_user.db";
 31     public static final String PACKAGE_NAME = "com.lfk.poem";// 應用的包名
 32     public static final String DB_PATH = "/data"
 33             + Environment.getDataDirectory().getAbsolutePath() +"/"
 34             + PACKAGE_NAME+ "/databases"; // 在手機裏存放數據庫的位置
 35     private SwipeRefreshLayout swipeLayout;
 36     private RelativeLayout main_layout;
 37     private TextView textView;
 38     private static int ID = 0;
 39     private String NAME;
 40     private String POEM;
 41     @Override
 42     protected void onCreate(Bundle savedInstanceState) {
 43         super.onCreate(savedInstanceState);
 44         setContentView(R.layout.activity_main);
 45 
 46         Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");
 47         textView = (TextView)findViewById(R.id.text_view);
 48         textView.setTypeface(typeface);
 49 
 50         main_layout = (RelativeLayout)findViewById(R.id.main_layout);
 51         ChangeBackground();
 52         FindaPoem();
 53         swipeLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh);
 54         swipeLayout.setColorScheme(R.color.haah);
 55         swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
 56             @Override
 57             public void onRefresh() {
 58                 new Handler().postDelayed(new Runnable() {//延遲跳轉=-=
 59                     public void run() {
 60                         swipeLayout.setRefreshing(true);
 61                         FindaPoem();
 62                         swipeLayout.setRefreshing(false);
 63                     }
 64                 }, 500);
 65             }
 66         });
 67     }
 68     private void FindaPoem() {
 69         int ll = (int) (1 + Math.random() * (59170));
 70         ID = ll;
 71         SQLiteDatabase database = openDatabase();
 72         Cursor cursor = database.rawQuery("Select * From poem Where _id = " + ll, null);
 73         cursor.moveToFirst();
 74         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);
 75         NAME = cursor.getString(2)+": "+cursor.getString(1);
 76         POEM = cursor.getString(13);
 77         Log.e(poem, "================");
 78         textView.setText(poem);
 79         cursor.close();
 80         database.close();
 81     }
 82     private void ChangeBackground(){
 83         int ln = (int) (1 + Math.random() * (5));
 84         switch (ln){
 85             case 1:
 86                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.detail_bg));
 87                 break;
 88             case 2:
 89                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_1));
 90                 break;
 91             case 3:
 92                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_2));
 93                 break;
 94             case 4:
 95                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_3));
 96                 break;
 97             case 5:
 98                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_4));
 99                 break;
100         }
101     }
102     public SQLiteDatabase openDatabase() {
103         try {
104             File myDataPath = new File(DB_PATH);
105             if (!myDataPath.exists())
106             {
107                 myDataPath.mkdirs();// 若是沒有這個目錄,則建立
108             }
109             String dbfile = myDataPath+"/"+DB_NAME;
110             if (!(new File(dbfile).exists())) {// 判斷數據庫文件是否存在，若不存在則執行導入，不然直接打開數據庫
111                 InputStream is;
112                 is = this.getResources().openRawResource(R.raw.poem_all); // 欲導入的數據庫
113                 FileOutputStream fos = new FileOutputStream(dbfile);
114                 byte[] buffer = new byte[BUFFER_SIZE];
115                 int count = 0 ;
116                 while ((count = is.read(buffer)) > 0) {
117                         fos.write(buffer, 0, count);
118                 }
119                 fos.close();
120                 is.close();
121             }
122             SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
123             Log.e("=======================","get it  ======================");
124             return db;
125         } catch (FileNotFoundException e) {
126             Log.e("Database", "File not found");
127             e.printStackTrace();
128         } catch (IOException e) {
129             Log.e("Database", "IO exception");
130             e.printStackTrace();
131         }
132         return null;
133     }
134     void AddaPoemToCollect(){
135         File myDataPath = new File(DB_PATH);
136         String dbfile = myDataPath+"/"+DB_USER_NAME;
137         SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
138         //ContentValues contentValues = new ContentValues();
139         db.execSQL("UPDATE poem SET ticai = 1 WHERE _id ="+ID);
140         //db.insert("book", null, contentValues);
141         db.close();
142         Toast.makeText(getApplicationContext(),
143                 "Collect succeed",
144                 Toast.LENGTH_SHORT).show();
145         //ID++;
146     }
147     @Override
148     public boolean onCreateOptionsMenu(Menu menu) {
149         // Inflate the menu; this adds items to the action bar if it is present.
150         MenuInflater inflater = getMenuInflater();
151         inflater.inflate(R.menu.menu_main, menu);
152         return super.onCreateOptionsMenu(menu);
153     }
154 
155     @Override
156     public boolean onOptionsItemSelected(MenuItem item) {
157         // Handle action bar item clicks here. The action bar will
158         // automatically handle clicks on the Home/Up button, so long
159         // as you specify a parent activity in AndroidManifest.xml.
160         int id = item.getItemId();
161         switch(id){
162             case R.id.collect:
163                 Intent intent = new Intent(this,Collect.class);
164                 startActivity(intent);
165                 break;
166             case R.id.like:
167                 AddaPoemToCollect();
168                 break;
169         }
170 
171         return super.onOptionsItemSelected(item);
172     }
173 }

View Code

　　這是修改過的主活動。

　　1.首先更換了字體放在assets文件夾內，在res裏面，沒有的請新建。

1  Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");
2         textView = (TextView)findViewById(R.id.text_view);
3         textView.setTypeface(typeface);

獲取了字體資源，註冊了一個textview，把字體設置爲textview。

這是修改過的效果，纖細的字體很適合咱們的古詩！

 1     private void ChangeBackground(){
 2         int ln = (int) (1 + Math.random() * (5));
 3         switch (ln){
 4             case 1:
 5                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.detail_bg));
 6                 break;
 7             case 2:
 8                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_1));
 9                 break;
10             case 3:
11                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_2));
12                 break;
13             case 4:
14                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_3));
15                 break;
16             case 5:
17                 main_layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.navigation_4));
18                 break;
19         }
20     }

　　添加了一個修改背景的函數，每次進入會隨機選擇背景，這樣咱們每次進入就有可能看到不同的背景了。

 1     private void FindaPoem() {
 2         int ll = (int) (1 + Math.random() * (59170));
 3         ID = ll;
 4         SQLiteDatabase database = openDatabase();
 5         Cursor cursor = database.rawQuery("Select * From poem Where _id = " + ll, null);
 6         cursor.moveToFirst();
 7         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);
 8         NAME = cursor.getString(2)+": "+cursor.getString(1);
 9         POEM = cursor.getString(13);
10         Log.e(poem, "================");
11         textView.setText(poem);
12         cursor.close();
13         database.close();
14     }

　　從數據庫裏隨即一個數（我數據庫裏有59170首詩，=-=！）而後打開數據庫，找到ID爲此項的詩，而後獲取詩的內容，getString的號碼要按照你本身的數據庫須要選擇不一樣的欄位，

好比0位就是ID的欄位，我這裏面做者古詩名和古詩內容是分開存放的，並且加入了很多我要用的數據，因此欄位增長到了13個之多，本身作的話只須要三個欄位就好，一個id，一個古詩內容，

一個收藏標記位（用0和1來標記）

　　因此我對dbhelper的數據庫生成類進行了一些修改：

 1 package com.lfk.poem;
 2 
 3 import android.content.Context;
 4 import android.database.sqlite.SQLiteDatabase;
 5 import android.database.sqlite.SQLiteOpenHelper;
 6 import android.widget.Toast;
 7 
 8 /**
 9  * Created by Administrator on 2015/5/8.
10  */
11 public class DBhelper extends SQLiteOpenHelper {
12     private  static final String CREAT_DB = "create table book ("
13             + "id integer primary key autoincrement,"
14             + "collect int,"
15             + "poem text)";
16     private Context mcontext;
17 
18     public DBhelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
19         super(context, name, factory, version);
20         mcontext = context;
21     }
22 
23     @Override
24     public void onCreate(SQLiteDatabase db) {
25         db.execSQL(CREAT_DB);
26         Toast.makeText(mcontext,"succeed collect！",Toast.LENGTH_SHORT).show();
27     }
28 
29     @Override
30     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
31     }
32 }

　　這樣生成的數據庫就能成功的應用收藏功能了，上一步所說的修改數據庫也就能實現了。

6.收藏功能的實現：

　　我在寫這篇博文以前曾經寫過兩次關於收藏的內容，第一次的方法比較蠢，我又開了一個用戶的數據庫，而後把要收藏的東西複製進用戶數據庫中，不過這種方法比較麻煩，

首先是開兩個數據庫增長了系統的無謂開銷，增長了對系統資源的消耗，並且在傳入新的數據庫中，id會發生變化，寫入和傳值會很是的不便利，因此我放棄了那種方法，改用

在數據庫設置標誌欄位的方法來解決問題。

  1 package com.lfk.poem;
  2 
  3 import android.app.Activity;
  4 import android.content.Intent;
  5 import android.database.Cursor;
  6 import android.database.sqlite.SQLiteDatabase;
  7 import android.os.Bundle;
  8 import android.os.Environment;
  9 import android.util.Log;
 10 import android.view.View;
 11 import android.widget.AdapterView;
 12 import android.widget.ArrayAdapter;
 13 import android.widget.ListView;
 14 import android.widget.TextView;
 15 import android.widget.Toast;
 16 
 17 import java.io.File;
 18 
 19 
 20 public class Collect extends Activity {
 21     private DBhelper dBhelper;
 22     private ListView listView;
 23     public static ArrayAdapter<String> mArrayAdapter;
 24     public static final String DB_NAME = "poem_all.db"; //保存的數據庫文件名
 25     public static final String PACKAGE_NAME = "com.lfk.poem";// 應用的包名
 26     public static final String DB_PATH = "/data"
 27             + Environment.getDataDirectory().getAbsolutePath() +"/"
 28             + PACKAGE_NAME+ "/databases"; // 在手機裏存放數據庫的位置
 29     @Override
 30     protected void onCreate(Bundle savedInstanceState) {
 31         super.onCreate(savedInstanceState);
 32         setContentView(R.layout.activity_collect);
 33         String[] data = new String[0];
 34         //dBhelper = new DBhelper(this,"poem_all.db",null,1);
 35         listView = (ListView)findViewById(R.id.list_view);
 36         mArrayAdapter = new ArrayAdapter<String>(this,R.layout.list_item);
 37         listView.setAdapter(mArrayAdapter);
 38         FindyourCollect();
 39         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 40             @Override
 41             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
 42                                     long arg3) {
 43                 System.out.println(arg2);
 44                 String temp = (String)((TextView)arg1).getText();
 45                 Intent intent = new Intent();
 46                 intent.putExtra("title",temp);
 47                 System.out.println(arg2);
 48                 intent.setClass(Collect.this, Collect_item.class);
 49                 startActivity(intent);
 50                 Toast.makeText(getApplicationContext(),
 51                         "Opening " + arg2,
 52                         Toast.LENGTH_SHORT).show();
 53                 mArrayAdapter.notifyDataSetChanged();
 54             }
 55         });
 56     }
 57 
 58 
 59 //    @Override
 60 //    public boolean onCreateOptionsMenu(Menu menu) {
 61 //        // Inflate the menu; this adds items to the action bar if it is present.
 62 //        getMenuInflater().inflate(R.menu.menu_collect, menu);
 63 //        return true;
 64 //    }
 65 //
 66 //    @Override
 67 //    public boolean onOptionsItemSelected(MenuItem item) {
 68 //        // Handle action bar item clicks here. The action bar will
 69 //        // automatically handle clicks on the Home/Up button, so long
 70 //        // as you specify a parent activity in AndroidManifest.xml.
 71 //        int id = item.getItemId();
 72 //
 73 //        //noinspection SimplifiableIfStatement
 74 //        if (id == R.id.action_settings) {
 75 //            return true;
 76 //        }
 77 //
 78 //        return super.onOptionsItemSelected(item);
 79 //    }
 80     void FindyourCollect(){
 81         File myDataPath = new File(DB_PATH);
 82         String dbfile = myDataPath+"/"+DB_NAME;
 83         SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(dbfile, null);
 84         Cursor cursor = database.rawQuery("Select * From poem where ticai = 1", null);
 85         Log.e("===================", "================");
 86         if(cursor.moveToFirst()) {
 87             Log.e("===================", "================");
 88             do {
 89                 String title = cursor.getString(cursor.getColumnIndex("mingcheng"));
 90                 mArrayAdapter.add(title);
 91                 Log.e(title, "================");
 92             }while (cursor.moveToNext());
 93         }
 94         cursor.close();
 95         database.close();
 96     }
 97     @Override
 98     protected void onRestart(){
 99         super.onRestart();
100         mArrayAdapter.clear();
101         FindyourCollect();
102         mArrayAdapter.notifyDataSetChanged();
103     }
104 }

這是Collect的活動的代碼，代碼中用了一個系統自帶的簡易的listview（主要是也不須要太多的功能），進入以後運行FindyourCollect()方法用Select * From poem where ticai = 1語法，

尋找標誌位，而後把全部找到的東西加入listview中去，而後設置item的響應打開。

 1 package com.lfk.poem;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.database.Cursor;
 6 import android.database.sqlite.SQLiteDatabase;
 7 import android.graphics.Typeface;
 8 import android.os.Bundle;
 9 import android.util.Log;
10 import android.view.Menu;
11 import android.view.MenuItem;
12 import android.widget.TextView;
13 import android.widget.Toast;
14 
15 
16 public class Collect_item extends Activity {
17     private DBhelper dBhelper;
18     private String ID;
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_collect_item);
23         Intent intent = getIntent();
24         String title = intent.getStringExtra("title");
25         //System.out.println(id+"=================");
26         TextView textView = (TextView)findViewById(R.id.poem_item);
27         Typeface typeface = Typeface.createFromAsset(getAssets(),"fonts/font_ksj.ttf");
28         textView.setTypeface(typeface);
29         dBhelper = new DBhelper(this,"poem_all.db",null,1);
30         SQLiteDatabase database = dBhelper.getWritableDatabase();
31         Cursor cursor = database.rawQuery("Select * From poem where mingcheng="+"\""+title+"\"", null);
32         cursor.moveToFirst();
33         ID = cursor.getString(cursor.getColumnIndex("_id"));
34         String poem = cursor.getString(1)+"\n"+"\n"+cursor.getString(2)+"\n"+"\n"+cursor.getString(13);
35         textView.setText(poem);
36         Log.e("===================", "================");
37         cursor.close();
38         database.close();
39     }
40 
41     @Override
42     public boolean onCreateOptionsMenu(Menu menu) {
43         // Inflate the menu; this adds items to the action bar if it is present.
44         getMenuInflater().inflate(R.menu.menu_collect_item, menu);
45         return true;
46     }
47 
48     @Override
49     public boolean onOptionsItemSelected(MenuItem item) {
50         // Handle action bar item clicks here. The action bar will
51         // automatically handle clicks on the Home/Up button, so long
52         // as you specify a parent activity in AndroidManifest.xml.
53         int id = item.getItemId();
54 
55         if(id == R.id.dislike_collect){
56             SQLiteDatabase db = dBhelper.getWritableDatabase();
57             db.execSQL("UPDATE poem SET ticai = 0 WHERE _id ="+ID);
58             db.close();
59             Toast.makeText(getApplicationContext(),
60                     "Collect Delete",
61                     Toast.LENGTH_SHORT).show();
62         }
63 
64         return super.onOptionsItemSelected(item);
65     }
66 
67 }

打開後的方法比較簡單和主活動基本同樣，接受傳入的題目，而後根據題目找到咱們須要的詩，設置字體而後textview中顯示出來。

而後就是加入收藏了，爲了方便，我把加入收藏寫進了meau中以方便使用：

 1  void AddaPoemToCollect(){
 2         //File myDataPath = new File(DB_PATH);
 3         //String dbfile = myDataPath+"/"+DB_USER_NAME;
 4         SQLiteDatabase db = openDatabase();
 5         //ContentValues contentValues = new ContentValues();
 6         db.execSQL("UPDATE poem SET ticai = 1 WHERE _id ="+ID);
 7         //db.insert("book", null, contentValues);
 8         db.close();
 9         Toast.makeText(getApplicationContext(),
10                 "Collect succeed",
11                 Toast.LENGTH_SHORT).show();
12         //ID++;
13     }
14     void deleteAPoemFromCollect(){
15         SQLiteDatabase db = openDatabase();
16 
17         db.execSQL("UPDATE poem SET ticai = 0 WHERE _id ="+ID);
18 
19         db.close();
20 
21         Toast.makeText(getApplicationContext(),
22                 "Collect Delete",
23                 Toast.LENGTH_SHORT).show();
24     }