here is the LogCat I can't post image so i put it in google drive
这里是LogCat我无法发布图像,所以我把它放在谷歌驱动器
////////And here is the DB///////
////////这是DB ///////
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class UserDB {
public static final String TABLE_USER = "User";
public static final String ID = "ID";
public static final String USERNAME = "USERNAME";
public static final String PASSWORD = "PASSWORD";
public static final String CHKPASSWORD = "CHKPASSWORD";
public static final String SEX = "SEX";
public static final String eat = "eat";
public static final String drink = "drink";
public static final String smoke = "smoke";
public static final String conctrolweigh = "conctrolweigh";
public static final String blosuger = "blosuger";
public static final String hospital = "hospital";
private Context Context = null;
public static final String Education = "Education";
public static class DatabaseHelper extends SQLiteOpenHelper{
public static final String DATABASE_NAME = "diabetes.db";
private static final int DATABASE_VERSION = 1;
//usertable
public DatabaseHelper(Context context, CursorFactory factory) {
super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}
public static final String TABLE_USER_CREATE =
"CREATE TABLE " + TABLE_USER
+ "("
+ ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ USERNAME + " text , "
+ PASSWORD+ " text ,"
+ CHKPASSWORD+ " text ,"
+ SEX+ " text ,"
+ eat + " text , "
+ drink + " text, "
+ smoke + " text, "
+ conctrolweigh + " text, "
+ blosuger + " text, "
+ hospital + " text, "
+ Education + " text);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onOpen(SQLiteDatabase db) {
super.onOpen(db);
// 每次成功打開資料庫後首先被執行
}
@Override
public synchronized void close() {
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(TABLE_USER_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROPB TABLE IF EXISTS " + TABLE_USER);
onCreate(db);
}
}
public DatabaseHelper dbHelper;
public SQLiteDatabase db;
public UserDB(Context context){
this.Context = context;
DatabaseHelper openHelper = new DatabaseHelper(this.Context);
this.db = openHelper.getWritableDatabase();
}
public UserDB open() throws SQLException{
dbHelper = new DatabaseHelper(Context);
db = dbHelper.getWritableDatabase();
return this;
}
public void close(){
dbHelper.close();
}
//add user
public void insertEntry(String ID, String PWD,String CHPW,String SEX,String eat,String drink,String smoke,String conctrolweigh,String blosuger,String hospital,String Education){
if (PWD.equals(CHPW)){
ContentValues newValues = new ContentValues();
newValues.put("USERNAME", ID);
newValues.put("PASSWORD", PWD);
newValues.put("CHKPASSWORD", CHPW);
newValues.put("SEX", SEX);
newValues.put("eat", eat);
newValues.put("drink", drink);
newValues.put("smoke", smoke);
newValues.put("conctrolweigh", conctrolweigh);
newValues.put("blosuger", blosuger);
newValues.put("hospital", hospital);
newValues.put("Education", Education);
db.insert(TABLE_USER, null, newValues);
}else{
}
}
public String getSinlgeEntry(String userName) {
Cursor cursor = db.query("User", null, " USERNAME=?",
new String[] { userName }, null, null, null);
if (cursor.getCount() < 1) // UserName Not Exist
return "Not Exist";
cursor.moveToFirst();
String password = cursor.getString(cursor.getColumnIndex("PASSWORD"));
return password;
}
public SQLiteDatabase getReadableDatabase() {
// TODO Auto-generated method stub
return null;
}
}
//////here is the Activity//////////
public class SelfteachingActivity extends Activity {
Button btnselback,tvartical ,tvfood,tvhealth,tvexcise;
TextView tvid,tvstore,tveat,tvhospital,tvblosuger,tvconctrolweigh,tvdrink,tvsmoke,tvSEX,tvEducation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_selfteaching);
findViews();
setListeners();
//openDatabase();
String username= (this.getIntent().getExtras().getString("username"));
tvstore.setText(username);
tvid.setText(tvstore.getText().toString());
query();
}
private void query() {
UserDB helper = new UserDB(this);
SQLiteDatabase db = helper.getReadableDatabase();
helper.open();
if(helper.getReadableDatabase() == null){
Log.i("Log Activity Test", "helper is null!!!!!!!!!");
}
String user = tvstore.getText().toString();
try {
Log.i("Log Activity Test", "start db!!");
Cursor cursor = db.rawQuery("SELECT SEX,hospital,blosuger,drink,conctrolweigh,smoke,Education,eat FROM User Where USERNAME ='"+user+"'", null);
if(cursor!=null){
int rows_num = cursor.getCount();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Integer Id = cursor.getInt(cursor.getColumnIndex("id"));
tvSEX.setText(cursor.getString(cursor.getColumnIndex("SEX")));
tvhospital.setText(cursor.getString(cursor.getColumnIndex("hospital")));
tvblosuger.setText(cursor.getString(cursor.getColumnIndex("blosuger")));
tvdrink.setText(cursor.getString(cursor.getColumnIndex("drink")));
tvconctrolweigh.setText(cursor.getString(cursor.getColumnIndex("conctrolweigh")));
tvsmoke.setText(cursor.getString(cursor.getColumnIndex("smoke")));
tvEducation.setText(cursor.getString(cursor.getColumnIndex("Education")));
tveat.setText(cursor.getString(cursor.getColumnIndex("eat")));
cursor.moveToNext();
}
}
} catch (Exception ex) {
ex.printStackTrace();
} finally {
}
}
private long exitTime = 0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){
if((System.currentTimeMillis()-exitTime) > 2000){
Toast.makeText(getApplicationContext(), "再按一次返回鍵退出", Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
finish();
System.exit(0);
}
return true;
}
return super.onKeyDown(keyCode, event);
}
private void findViews(){
btnselback = (Button)findViewById(R.id.buttonselback);
tvartical = (Button)findViewById(R.id.buttonartical);
tvfood = (Button)findViewById(R.id.buttonfood);
tvhealth = (Button)findViewById(R.id.buttonhealth);
tvexcise = (Button)findViewById(R.id.buttonescise);
tvid = (TextView)findViewById(R.id.tVsid);
tvstore = (TextView)findViewById(R.id.tvstore);
tveat = (TextView)findViewById(R.id.tveat);
tvhospital= (TextView)findViewById(R.id.tvhospital);
tvblosuger= (TextView)findViewById(R.id.tvblosuger);
tvconctrolweigh= (TextView)findViewById(R.id.tvconctrolweigh);
tvdrink= (TextView)findViewById(R.id.tvdrink);
tvsmoke= (TextView)findViewById(R.id.tvsmoke);
tvSEX= (TextView)findViewById(R.id.tvSEX);
tvEducation= (TextView)findViewById(R.id.tvEducation);
}
private void setListeners(){
//回上一頁
btnselback.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = tvstore.getText().toString();
Intent intent = new Intent();
intent.setClass(SelfteachingActivity.this, LoginActivity.class);
intent.putExtra("username", username );
startActivity(intent);
SelfteachingActivity.this.finish();
}
});
//衛教文章
tvartical.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String username = tvstore.getText().toString();
Intent intent = new Intent();
intent.setClass(SelfteachingActivity.this, ArticalActivity.class);
intent.putExtra("SEX", tvSEX.getText().toString() );
intent.putExtra("username", username );
intent.putExtra("hospital", tvhospital.getText().toString());
intent.putExtra("blosuger", tvblosuger.getText().toString() );
intent.putExtra("drink", tvdrink.getText().toString() );
intent.putExtra("conctrolweigh", tvconctrolweigh.getText().toString());
intent.putExtra("smoke", tvsmoke.getText().toString());
intent.putExtra("Education", tvEducation.getText().toString());
intent.putExtra("eat", tveat.getText().toString());
startActivity(intent);
SelfteachingActivity.this.finish();
}
});
//食物衛教
tvfood.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = tvstore.getText().toString();
Intent intent = new Intent();
intent.setClass(SelfteachingActivity.this, FoodActivity.class);
intent.putExtra("username", username );
intent.putExtra("SEX", tvSEX.getText().toString() );
intent.putExtra("hospital", tvhospital.getText().toString());
intent.putExtra("blosuger", tvblosuger.getText().toString() );
intent.putExtra("drink", tvdrink.getText().toString() );
intent.putExtra("conctrolweigh", tvconctrolweigh.getText().toString());
intent.putExtra("smoke", tvsmoke.getText().toString());
intent.putExtra("Education", tvEducation.getText().toString());
intent.putExtra("eat", tveat.getText().toString());
startActivity(intent);
SelfteachingActivity.this.finish();
}
});
//健康衛教
tvhealth.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = tvstore.getText().toString();
Intent intent = new Intent();
intent.setClass(SelfteachingActivity.this, HealthActivity.class);
intent.putExtra("username", username );
intent.putExtra("SEX", tvSEX.getText().toString() );
intent.putExtra("hospital", tvhospital.getText().toString());
intent.putExtra("blosuger", tvblosuger.getText().toString() );
intent.putExtra("drink", tvdrink.getText().toString() );
intent.putExtra("conctrolweigh", tvconctrolweigh.getText().toString());
intent.putExtra("smoke", tvsmoke.getText().toString());
intent.putExtra("Education", tvEducation.getText().toString());
intent.putExtra("eat", tveat.getText().toString());
startActivity(intent);
SelfteachingActivity.this.finish();
}
});
//運動衛教
tvexcise.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = tvstore.getText().toString();
Intent intent = new Intent();
intent.setClass(SelfteachingActivity.this, ExciseActivity.class);
intent.putExtra("username", username );
intent.putExtra("SEX", tvSEX.getText().toString() );
intent.putExtra("hospital", tvhospital.getText().toString());
intent.putExtra("blosuger", tvblosuger.getText().toString() );
intent.putExtra("drink", tvdrink.getText().toString() );
intent.putExtra("conctrolweigh", tvconctrolweigh.getText().toString());
intent.putExtra("smoke", tvsmoke.getText().toString());
intent.putExtra("Education", tvEducation.getText().toString());
intent.putExtra("eat", tveat.getText().toString());
startActivity(intent);
SelfteachingActivity.this.finish();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.selfteaching, menu);
return true;
}
}
Problem:
1.i don't get any data from SQL but no crash
1.i不从SQL获取任何数据但没有崩溃
what is the problem with my code?
我的代码有什么问题?
the program stop in here
程序停在这里
Cursor cursor = db.rawQuery("SELECT SEX,hospital,blosuger,drink,conctrolweigh,smoke,Education,eat FROM User Where USERNAME ='"+user+"'", null);
and say null pointer , i check the db and is null , i don't know how this happen.
并说空指针,我检查数据库并且为空,我不知道这是怎么发生的。
plz help me
请帮助我
1 个解决方案
#1
0
Method that you call
你打电话的方法
SQLiteDatabase db = helper.getReadableDatabase();
returns your null due to your code:
由于您的代码返回null:
public SQLiteDatabase getReadableDatabase() {
// TODO Auto-generated method stub
return null;
}
#1
0
Method that you call
你打电话的方法
SQLiteDatabase db = helper.getReadableDatabase();
returns your null due to your code:
由于您的代码返回null:
public SQLiteDatabase getReadableDatabase() {
// TODO Auto-generated method stub
return null;
}