Question

我问过上一个问题here，但我没有回答我试图重组或使用不同的方法。

我已经从资产文件夹中打开并复制了一个数据库，这可以正常工作，因为第一个活动打开并从中正确显示..

这个想法是当你打开应用程序并调用类来打开圣经时，它会打开book类并且有一个ListView，在listview中是所有的圣经书籍，当点击时，它应该打开章节活动和在ListView中显示所有书的章节，选择章节时应打开诗歌活动，并在ListView中显示所有经文。

到目前为止，书中的Activity显示了书名，但是当我点击它时，它只显示一个白色的屏幕... 没有任何东西在logcat中显示错误。

我尝试过使用Intent，但我无法让它工作，有人可以帮助我吗？

也许我使用了错误的意图？以下是我认为您需要查看代码是否存在问题的代码请原谅我用于命名的南非荷兰语术语

从我使用的主要活动开始：

public class BybelActivityBoek extends Activity {

private ListView listviewBybel;
private customAdapterBoektext adapter_customAdapterBoektext;
private List<defineBybeldbBoek> defineBybeldbBoekList;
private DBHandlerBoek DBHandlerBoek_DBHelperBoek;
public String boek_id;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView (R.layout.activity_bybel_boek);
    listviewBybel = (ListView) findViewById(R.id.BybelBoekListView);
    DBHandlerBoek_DBHelperBoek = new DBHandlerBoek(this);

    //Check exists database
    File Database = getApplicationContext().getDatabasePath(DBHandlerBoek.DBNAME);
    if(false == Database.exists()){
        DBHandlerBoek_DBHelperBoek.getReadableDatabase();

        //Copy DB
        if (DBHandlerBoek.copyDatabase(this)){
            Toast.makeText(this, "Databasis Suksesvol", Toast.LENGTH_LONG).show();
        }else {
            Toast.makeText(this, "Databasis Probleem", Toast.LENGTH_LONG).show();
            return;
        }
    }

    //Get bybel list in db when db exists
    defineBybeldbBoekList = DBHandlerBoek_DBHelperBoek.getListBybel();

    //Init adapter
    adapter_customAdapterBoektext = new customAdapterBoektext(this, defineBybeldbBoekList);

    //Set adapter for listview
    listviewBybel.setAdapter(adapter_customAdapterBoektext);

    //Listview item click listener
    //BybelActivityHoofstuk will be launched by passing boek_id
    listviewBybel.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener(){
        @Override
        public void onItemClick (AdapterView<?> arg0, View view, int arg2, long arg3){

            //on selecting a book
            //BybelHoofstukActivity will be launched to show hoofstukke inside
            Intent boekIntent = new Intent(BybelActivityBoek.this, BybelActivityHoofstuk.class);
            boekIntent.putExtra(boek_id, String.valueOf(arg3));
            startActivity(boekIntent);
        }
    }
    );
}
}

然后是子活动：

public class BybelActivityHoofstuk extends Activity {
private ListView listviewHoofstuk;
private customAdapterHoofstuktext adapter_customAdapterHoofstuktext;
private List<defineBybeldbHoofstuk> defineBybeldbHoofstukList;
private DBHandlerHoofstuk DBHandlerHoofstuk_DBHelper;
private SQLiteDatabase mDatabase;


ArrayList<HashMap<String, String>> HoofstukList;

//Boek id
String boek_id_vanaf_BybelActivityBoek;

@Override
public void onCreate (Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bybel_hoofstuk);

    listviewHoofstuk = (ListView) findViewById(R.id.BybelHoofstukListView);
    DBHandlerHoofstuk_DBHelper = new DBHandlerHoofstuk(this);

    //Check exists database
    File Database = getApplicationContext().getDatabasePath(DBHandlerBoek.DBNAME);
    if(false == Database.exists()){
    DBHandlerHoofstuk_DBHelper.getReadableDatabase();

    //Get boek id
    Intent boekIntent = getIntent();
    boek_id_vanaf_BybelActivityBoek = boekIntent.getStringExtra("boek_id");

    //hashmap for listview
    HoofstukList = new ArrayList<HashMap<String, String>>();

    //Set adapter for listview
    listviewHoofstuk.setAdapter(adapter_customAdapterHoofstuktext);

    //Get bybel list in db when db exists
    defineBybeldbHoofstukList = DBHandlerHoofstuk_DBHelper.getListHoofstuk();

    //Init adapter
    adapter_customAdapterHoofstuktext = new customAdapterHoofstuktext(this,defineBybeldbHoofstukList);

        listviewHoofstuk.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener(){
        @Override
        public void onItemClick (AdapterView<?> arg0, View view, int arg2, long arg3){
            //on selecting single track get vers text
            Intent hoofstukid = new Intent(getApplicationContext(),BybelActivityVers.class);
            //to get vers hoofstuk_id is needed
           String hoofstuk_id = ((TextView)view.findViewById(R.id.hoofstuk_id)).getText().toString();

            hoofstukid.putExtra("hoofstuk_id", hoofstuk_id);

            startActivity(hoofstukid);
        }
    });
}
 }
}

我的主要DBClass：

public class defineBybeldbBoek extends AppCompatActivity{

public int _id;
private String _hebreeus;
private String _afrikaans;

public defineBybeldbBoek(int boek_id, String _hebreeus, String _afrikaans){
    this._id = boek_id;
    this._hebreeus = _hebreeus;
    this._afrikaans = _afrikaans;

}

public int getboek_id() {
    return _id;
}

public String get_hebreeus() {
    return _hebreeus;
}

public String get_afrikaans() {
    return _afrikaans;
}

}

我的子DBClass：

public class defineBybeldbHoofstuk extends AppCompatActivity{

private int hoofstuk_se_boek_id;
private int _id;
private int _hoofstuk;

public defineBybeldbHoofstuk(int hoofstuk_se_boek_id, int hoofstuk_id, int _hoofstuk){
    this.hoofstuk_se_boek_id = hoofstuk_se_boek_id;
    this._id = hoofstuk_id;
    this._hoofstuk = _hoofstuk;
}

public int get_hoofstuk() {
    return _hoofstuk;
}

public int hoofstuk_se_boek_id() {
    return hoofstuk_se_boek_id;
}

public int get_id() {
    return _id;
}

}

主要的DBHandler：

public class DBHandlerBoek extends SQLiteOpenHelper{
public static final int DATABASE_VERSION = 1;
public static final String DBNAME = "db name.db";
public static final String DBLOCATION = "correct db path here";

private Context mContext;
private SQLiteDatabase mDatabase;

public static final String TABLE_BOEK = "table_boek";
public static final String COLUMN_BOEK_ID = "_id";
public static final String COLUMN_BOEK_HEBREEUS = "_hebreeus";
public static final String COLUMN_BOEK_AFRIKAANS = "_afrikaans";

public static final String TABLE_HOOFSTUK = "table_hoofstuk";
public static final String COLUMN_HOOFSTUK_SE_BOEK_ID = "_id";

public DBHandlerBoek(Context context) {
    super(context, DBNAME, null, DATABASE_VERSION);
    this.mContext = context;
}

//Blank want db bestaan klaar
@Override
public void onCreate(SQLiteDatabase db) {

}
//When app gets installed, copy db to device when this activity runs
public static boolean copyDatabase(Context context){
    try {
        InputStream inputStream = context.getAssets().open(DBHandlerBoek.DBNAME);
        String outFileName = DBHandlerBoek.DBLOCATION + DBHandlerBoek.DBNAME;
        OutputStream outputStream = new FileOutputStream(outFileName);
        byte[]buff = new byte[1024];
        int length = 0;
        while ((length = inputStream.read(buff)) > 0) {
            outputStream.write(buff, 0, length);
        }
        outputStream.flush();
        outputStream.close();
        Log.w("BybelActivityBoek", "DB Copied");
        return true;
    }
    catch (Exception e){
        e.printStackTrace();
        return false;
    }
}

//blank want db word ekstern geupgrade
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

//maak db oop
public void opendatabase(){
    String dbPath = mContext.getDatabasePath(DBNAME).getPath();
    if (mDatabase !=null && mDatabase.isOpen()) {
        return;
    }

    mDatabase = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
}

//maak db toe
public void closeDatabase(){
    if (mDatabase!=null) {
        mDatabase.close();
    }
}

public List<defineBybeldbBoek> getListBybel(){
    defineBybeldbBoek defineBybeldbBoek = null;
    List<defineBybeldbBoek> defineBybelDBList = new ArrayList<>();
    opendatabase();
    Cursor cursor = mDatabase.rawQuery("SELECT * FROM table_boek", null);/*(die tabel se naam)*/
    cursor.moveToFirst();
    while (!cursor.isAfterLast()){
        defineBybeldbBoek = new defineBybeldbBoek(cursor.getInt(0), cursor.getString(1),cursor.getString(2));
        defineBybelDBList.add(defineBybeldbBoek);
        cursor.moveToNext();
    }
    cursor.close();
    closeDatabase();
    return defineBybelDBList;
}
}

子DBHandler：

public class DBHandlerHoofstuk extends SQLiteOpenHelper{
public static final int DATABASE_VERSION = 1;
public static final String DBNAME = "db name.db";
public static final String DBLOCATION = "correct db path here";

private Context mContext;
private SQLiteDatabase mDatabase;

public static final String TABLE_HOOFSTUK = "table_hoofstuk";
public static final String COLUMN_HOOFSTUK_BOEK_ID = "hoofstuk_se_boek_id";
public static final String COLUMN_HOOFSTUK_ID = "_id";
public static final String COLUMN_HOOFSTUK = "_hoofstuk";

public DBHandlerHoofstuk(Context context) {
    super(context, DBNAME, null, DATABASE_VERSION);
    this.mContext = context;
}

//Blank want db bestaan klaar
@Override
public void onCreate(SQLiteDatabase db) {

}

//blank want db word ekstern geupgrade
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

//maak db oop
public void opendatabase(){
    String dbPath = mContext.getDatabasePath(DBNAME).getPath();
    if (mDatabase !=null && mDatabase.isOpen()) {
        return;
    }

    mDatabase = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
}

//maak db toe
public void closeDatabase(){
    if (mDatabase!=null) {
        mDatabase.close();
    }
}

public List<defineBybeldbHoofstuk> getListHoofstuk(){
    defineBybeldbHoofstuk defineBybeldbHoofstuk = null;
    List<defineBybeldbHoofstuk> defineBybeldbHoofstukList = new ArrayList<>();
    opendatabase();
    Cursor cursor = mDatabase.rawQuery("SELECT * FROM table_hoofstuk", null);/*(die tabel se naam)*/
    cursor.moveToFirst();
    while (!cursor.isAfterLast()){
        defineBybeldbHoofstuk = new defineBybeldbHoofstuk(cursor.getInt(0), cursor.getInt(1),cursor.getInt(2));
        defineBybeldbHoofstukList.add(defineBybeldbHoofstuk);
        cursor.moveToNext();
    }
    cursor.close();
    closeDatabase();
    return defineBybeldbHoofstukList;
}
}

Answer 1

正如我所提到的，您需要在代码中进行许多修改，但目前您可以通过以下更改来运行代码：

首先在DBHandlerHoofstuk类中更改您的getListHoofstuk方法

public List<defineBybeldbHoofstuk> getListHoofstuk(String boek_id_vanaf_BybelActivityBoek)
{

   defineBybeldbHoofstuk defineBybeldbHoofstuk = null;
   List<defineBybeldbHoofstuk> defineBybeldbHoofstukList = new ArrayList<>();
   opendatabase();
   Cursor cursor = mDatabase.rawQuery("SELECT * FROM table_hoofstuk WHERE " + COLUMN_HOOFSTUK_BOEK_ID + " = '" + boek_id_vanaf_BybelActivityBoek + "'", null);/*(die tabel se naam)*/

   cursor.moveToFirst();

   while (!cursor.isAfterLast()){
       defineBybeldbHoofstuk = new defineBybeldbHoofstuk(cursor.getInt(0), cursor.getInt(1),cursor.getInt(2));
       defineBybeldbHoofstukList.add(defineBybeldbHoofstuk);
       cursor.moveToNext();
   }

   cursor.close();
   closeDatabase();
   return defineBybeldbHoofstukList;
}

现在通过以下方式更改您的BybelActivityHoofstuk活动

public class BybelActivityHoofstuk extends Activity
{
    private ListView listviewHoofstuk;
    private customAdapterHoofstuktext adapter_customAdapterHoofstuktext;
    private List<defineBybeldbHoofstuk> defineBybeldbHoofstukList;
    private DBHandlerHoofstuk DBHandlerHoofstuk_DBHelper;
    private SQLiteDatabase mDatabase;
    ArrayList<HashMap<String, String>> HoofstukList;

    //Boek id
    String boek_id_vanaf_BybelActivityBoek;

    @Override
    public void onCreate (Bundle savedInstanceState)
    {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_bybel_hoofstuk);

            listviewHoofstuk = (ListView) findViewById(R.id.BybelHoofstukListView);
            DBHandlerHoofstuk_DBHelper = new DBHandlerHoofstuk(this);


            //Check exists database
            File Database = getApplicationContext().getDatabasePath(DBHandlerBoek.DBNAME);
        if(false == Database.exists()){
                DBHandlerBoek_DBHelperBoek.getReadableDatabase();

                //Copy DB
                if (DBHandlerBoek.copyDatabase(this)){
                        Toast.makeText(this, "Databasis Suksesvol", Toast.LENGTH_LONG).show();
                }else {
                        Toast.makeText(this, "Databasis Probleem", Toast.LENGTH_LONG).show();
                        return;
                }
            }
            DBHandlerHoofstuk_DBHelper.getReadableDatabase();

            //Get boek id
            Intent boekIntent = getIntent();
            boek_id_vanaf_BybelActivityBoek = boekIntent.getStringExtra("boek_id");

            //hashmap for listview
            HoofstukList = new ArrayList<HashMap<String, String>>();

            //Get bybel list in db when db exists
            defineBybeldbHoofstukList = DBHandlerHoofstuk_DBHelper.getListHoofstuk(boek_id_vanaf_BybelActivityBoek);

        //Init adapter
        adapter_customAdapterHoofstuktext = new customAdapterHoofstuktext(this,defineBybeldbHoofstukList);

        //Set adapter for listview
            listviewHoofstuk.setAdapter(adapter_customAdapterHoofstuktext);


        listviewHoofstuk.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick (AdapterView<?> arg0, View view, int arg2, long arg3){
                    //on selecting single track get vers text
                    Intent hoofstukid = new Intent(getApplicationContext(),BybelActivityVers.class);
                    //to get vers hoofstuk_id is needed
                String hoofstuk_id = ((TextView)view.findViewById(R.id.hoofstuk_id)).getText().toString();

                    hoofstukid.putExtra("hoofstuk_id", hoofstuk_id);

                    startActivity(hoofstukid);
            }
        });
    }
}

SQLite Listview onclick过滤db以打开新活动的结果

1 个答案: