在Android的所有活动（SQLLite）中共享相同的数据库

这是我的ProfileActivity（其中用户输入他们的个人资料信息，如姓名，年龄，性别和出生日期）我已成功实施创建数据库，存储他们的个人资料信息。在Android的所有活动（SQLLite）中共享相同的数据库

ProfileActivity

public class ProfileActivity extends AppCompatActivity { 

//datepicker 
private DatePicker datePicker; 
private Calendar calendar; 
private TextView dateView; 
private int year, month, day; 

//submit button 
private Button submit; 

static final int DATE_DIALOG_ID = 100; 

//variables for database 
EditText name,age; 
RadioGroup rg; 
TextView bday; 
MyDBAdapter dbhandler; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_profile); 

    //set customize font 
    TextView tx = (TextView)findViewById(R.id.header_notification); 
    Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/custom.ttf"); 
    tx.setTypeface(custom_font); 

    TextView tx2 = (TextView)findViewById(R.id.submit); 
    Typeface custom_font2 = Typeface.createFromAsset(getAssets(), "fonts/text.ttf"); 
    tx2.setTypeface(custom_font2); 

    setDate(); 
    submit(); 

    name = (EditText) findViewById(R.id.input_name); 
    age = (EditText) findViewById(R.id.input_age); 
    //radio group 
    rg=(RadioGroup)findViewById(R.id.radiogrp); 
    bday = (TextView) findViewById(R.id.showBirthDate); 

    //create database 
    dbhandler = new MyDBAdapter(this); 
} 


public void addUser(){ 
    String addname=name.getText().toString(); 
    int addage=Integer.parseInt(age.getText().toString()); 
    String addgender= ((RadioButton)this.findViewById(rg.getCheckedRadioButtonId())).getText().toString(); 
    String addbday = bday.getText().toString(); 

    long id2=dbhandler.insertData(addname,addage,addgender,addbday); 
    if(id2<0){ 
     MessageTo.message(this, "Unsuccessful"); 
    }else{ 
     MessageTo.message(this, "Successful"); 
    } 
} 

public void viewDetails(){ 
    String data=dbhandler.getAllData(); 
    MessageTo.message(this, data); 
} 

public void submit(){ 

    submit = (Button) findViewById(R.id.submit); 

    submit.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent myIntent = new Intent(ProfileActivity.this, MainMenuActivity.class); 
      startActivity(myIntent); 

      addUser(); 
      viewDetails(); 
     } 
    }); 

} 

public void setDate(){ 

    dateView = (TextView) findViewById(R.id.showBirthDate); 
    /* Typeface custom_font5 = Typeface.createFromAsset(getAssets(), "fonts/text.ttf"); 
    dateView.setTypeface(custom_font5); */ 

    calendar = Calendar.getInstance(); 
    year = calendar.get(Calendar.YEAR); 

    month = calendar.get(Calendar.MONTH); 
    day = calendar.get(Calendar.DAY_OF_MONTH); 
    showDate(year, month+1, day); 

} 

@SuppressWarnings("deprecation") 
public void setDate(View view) { 
    showDialog(DATE_DIALOG_ID); 
    /* 
    Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT) 
      .show(); 
    */ 
} 

@Override 
protected Dialog onCreateDialog(int id) { 
    // TODO Auto-generated method stub 
    if (id == DATE_DIALOG_ID) { 
     return new DatePickerDialog(this, myDateListener, year, month, day); 
    } 
    return null; 
} 

private DatePickerDialog.OnDateSetListener myDateListener = new DatePickerDialog.OnDateSetListener() { 
    @Override 
    public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) { 
     // TODO Auto-generated method stub 
     // arg1 = year 
     // arg2 = month 
     // arg3 = day 
     showDate(arg1, arg2+1, arg3); 
    } 
}; 

private void showDate(int year, int month, int day) { 
    dateView.setText(new StringBuilder().append(month).append("/") 
      .append(day).append("/").append(year)); 
} 

@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_profile, 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); 
}

}

我试图显示存储的数据到另一个活性，因此。 但未能.......

ManageProfileActivity

public class ManageProfileActivity extends AppCompatActivity { 

private DatePicker datePicker; 
private Calendar calendar; 
private TextView dateView; 
private int year, month, day; 
private ImageButton back; 
static final int DATE_DIALOG_ID = 100; 

//variables for database 
EditText name,age; 
RadioGroup rg; 
RadioButton male; 
RadioButton female; 
TextView bday; 
MyDBAdapter dbadapter; 
MyDBHandler dbhandler; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_manage_profile); 

    //set customize font 
    TextView tx = (TextView)findViewById(R.id.header_notification); 
    Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/custom.ttf"); 
    tx.setTypeface(custom_font); 

    TextView tx2 = (TextView)findViewById(R.id.edit); 
    Typeface custom_font2 = Typeface.createFromAsset(getAssets(), "fonts/text.ttf"); 
    tx2.setTypeface(custom_font2); 

    TextView tx3 = (TextView)findViewById(R.id.delete); 
    Typeface custom_font3 = Typeface.createFromAsset(getAssets(), "fonts/text.ttf"); 
    tx3.setTypeface(custom_font3); 

    setDate(); 
    back(); 

    name = (EditText) findViewById(R.id.input_name); 
    age = (EditText) findViewById(R.id.input_age); 
    //radio group 
    rg=(RadioGroup)findViewById(R.id.radiogrp); 
    male =(RadioButton)findViewById(R.id.male); 
    female =(RadioButton)findViewById(R.id.female); 
    bday = (TextView) findViewById(R.id.showBirthDate); 

    //user profile 
    getDetail(); 
    dbadapter = new MyDBAdapter(this); 

} 

public void getDetail(){ 
    int id = 1; 

    SQLiteDatabase db=dbhandler.getWritableDatabase(); 

    //columns 
    String[] columns={dbhandler.COLUMN_NAME,dbhandler.COLUMN_AGE,dbhandler.COLUMN_GENDER,dbhandler.COLUMN_BIRTHDATE}; 
    Cursor cursor=db.query(dbhandler.TABLE_PROFILE,columns,dbhandler.COLUMN_ID+" = '"+id+"'",null,null,null,null); 
    while(cursor.moveToNext()){ 
     int index1=cursor.getColumnIndex(dbhandler.COLUMN_NAME); 
     int index2=cursor.getColumnIndex(dbhandler.COLUMN_AGE); 
     int index3=cursor.getColumnIndex(dbhandler.COLUMN_GENDER); 
     int index4=cursor.getColumnIndex(dbhandler.COLUMN_BIRTHDATE); 
     String username=cursor.getString(index1); 
     String userage=cursor.getString(index2); 
     String usergender=cursor.getString(index3); 
     String userbday=cursor.getString(index4); 
    } 

} 

//Back button 
public void back(){ 

    back = (ImageButton) findViewById(R.id.backbtn); 

    back.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent myIntent = new Intent(ManageProfileActivity.this, SettingsActivity.class); 
      startActivity(myIntent); 
     } 
    }); 
} 

public void setDate(){ 

    dateView = (TextView) findViewById(R.id.showBirthDate); 
    /* Typeface custom_font5 = Typeface.createFromAsset(getAssets(), "fonts/text.ttf"); 
    dateView.setTypeface(custom_font5); */ 

    calendar = Calendar.getInstance(); 
    year = calendar.get(Calendar.YEAR); 

    month = calendar.get(Calendar.MONTH); 
    day = calendar.get(Calendar.DAY_OF_MONTH); 
    showDate(year, month+1, day); 

} 

@SuppressWarnings("deprecation") 
public void setDate(View view) { 
    showDialog(DATE_DIALOG_ID); 
    /* 
    Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT) 
      .show(); 
    */ 
} 

@Override 
protected Dialog onCreateDialog(int id) { 
    // TODO Auto-generated method stub 
    if (id == DATE_DIALOG_ID) { 
     return new DatePickerDialog(this, myDateListener, year, month, day); 
    } 
    return null; 
} 

private DatePickerDialog.OnDateSetListener myDateListener = new DatePickerDialog.OnDateSetListener() { 
    @Override 
    public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) { 
     // TODO Auto-generated method stub 
     // arg1 = year 
     // arg2 = month 
     // arg3 = day 
     showDate(arg1, arg2+1, arg3); 
    } 
}; 

private void showDate(int year, int month, int day) { 
    dateView.setText(new StringBuilder().append(month).append("/") 
      .append(day).append("/").append(year)); 
} 


@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_manage_profile, 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); 
}

}

这是我MyDBAdapter（处理该数据库中的类）

MyDBAdapter

public class MyDBAdapter{ 

MyDBHandler dbhandler; 
public MyDBAdapter(Context context){ 
    dbhandler = new MyDBHandler(context); 
} 

public long insertData(String name, int age, String gender,String bday){ 
    SQLiteDatabase db=dbhandler.getWritableDatabase(); 
    ContentValues values=new ContentValues(); 
    values.put(MyDBHandler.COLUMN_NAME, name); 
    values.put(MyDBHandler.COLUMN_AGE, age); 
    values.put(MyDBHandler.COLUMN_GENDER, gender); 
    values.put(MyDBHandler.COLUMN_BIRTHDATE, bday); 
    long id2=db.insert(MyDBHandler.TABLE_PROFILE, null, values); 
    return id2; 
} 

public String getAllData(){ 
    SQLiteDatabase db=dbhandler.getWritableDatabase(); 

    //columns 
    String[] columns={MyDBHandler.COLUMN_ID,MyDBHandler.COLUMN_NAME,MyDBHandler.COLUMN_AGE,MyDBHandler.COLUMN_GENDER,MyDBHandler.COLUMN_BIRTHDATE}; 
    Cursor cursor=db.query(MyDBHandler.TABLE_PROFILE,columns,null,null,null,null,null); 
    StringBuffer buffer = new StringBuffer(); 
    while(cursor.moveToNext()){ 
     int cid=cursor.getInt(0); 
     String name=cursor.getString(1); 
     String age=cursor.getString(2); 
     String gender=cursor.getString(3); 
     String bday=cursor.getString(4); 
     buffer.append(cid+" "+name+" "+age+" "+gender+" "+bday+"\n"); 
    } 

    return buffer.toString(); 
} 

public String getData(int id){ 
    SQLiteDatabase db=dbhandler.getWritableDatabase(); 

    //columns 
    String[] columns={MyDBHandler.COLUMN_NAME,MyDBHandler.COLUMN_AGE,MyDBHandler.COLUMN_GENDER,MyDBHandler.COLUMN_BIRTHDATE}; 
    Cursor cursor=db.query(MyDBHandler.TABLE_PROFILE,columns, MyDBHandler.COLUMN_ID+" = '"+id+"'",null,null,null,null); 
    StringBuffer buffer = new StringBuffer(); 
    while(cursor.moveToNext()){ 
     int index1=cursor.getColumnIndex(MyDBHandler.COLUMN_NAME); 
     int index2=cursor.getColumnIndex(MyDBHandler.COLUMN_AGE); 
     int index3=cursor.getColumnIndex(MyDBHandler.COLUMN_GENDER); 
     int index4=cursor.getColumnIndex(MyDBHandler.COLUMN_BIRTHDATE); 
     String username=cursor.getString(index1); 
     String userage=cursor.getString(index2); 
     String usergender=cursor.getString(index3); 
     String userbday=cursor.getString(index4); 
     buffer.append(username+" "+userage+" "+usergender+" "+userbday+"\n"); 
    } 
    return buffer.toString(); 
} 



static class MyDBHandler extends SQLiteOpenHelper{ 
    private static final int DATABASE_VERSION = 8; 
    private static final String DATABASE_NAME = "profile.db"; 
    public static final String TABLE_PROFILE = "profile"; 
    public static final String COLUMN_ID = "_id"; 
    public static final String COLUMN_NAME = "name"; 
    public static final String COLUMN_AGE = "age"; 
    public static final String COLUMN_GENDER = "gender"; 
    public static final String COLUMN_BIRTHDATE = "birthdate"; 
    private Context context; 

    public MyDBHandler(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     this.context=context; 
     MessageTo.message(context,"constructor called"); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_TABLE_PROFILE ="CREATE TABLE " + TABLE_PROFILE + "(" 
       + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " 
       + COLUMN_NAME + " TEXT," 
       + COLUMN_AGE + " INTEGER, " 
       + COLUMN_GENDER + " TEXT," 
       + COLUMN_BIRTHDATE + " TEXT" + ")"; 

     db.execSQL(CREATE_TABLE_PROFILE); 
     MessageTo.message(context, "onCreate called"); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     MessageTo.message(context, "onUpgrade called"); 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_PROFILE); 
     onCreate(db); 
    }

你能告诉我如何在ManageProfileActivity中显示数据吗？我只想在数据库中显示一行。我是Android新手。感谢帮助。

来源

2015-09-14 ruby rose

我不知道如何发布logcat的 –

刚过从这里复制并发布你的错误logcat。我会格式化它..！ – AndiGeeky

没有什么真正的错误。该应用刚刚停止 –

在ManageProfileActivity的onCreate方法

您呼叫的将对DBAdapter构造您所呼叫的方法getDetail（）

//user profile 
getDetail(); 
dbadapter = new MyDBAdapter(this); // this line should be above your getDeta() method.

进行纠正如下

dbadapter = new MyDBAdapter(this); 
getDetail();

来源

2015-09-14 05:27:45 harshitpthk

仍然相同。它不会工作。 –

发生了什么你可以尝试破译，如果可能的话把日志猫，如果应用程序崩溃，没有上述变化，你会得到一个空指针异常，如果你可以把logcat我可以看到哪里可能是问题。 – harshitpthk

在Android的所有活动（SQLLite）中共享相同的数据库

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