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此代码将显示正确的TextView中的空白字符串，但是当我尝试显示我的数据库的内容我得到一个错误任何人都可以看到我的注释掉代码的问题？需要帮助发送数据到textview
public String getData() {
String data = "";
String[] columns = new String[] {KEY_ROWID, KEY_EXERCISE, KEY_WEIGHT, KEY_SETS};
/*Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
int iRow = c.getColumnIndex(KEY_ROWID);
int iExercise = c.getColumnIndex(KEY_EXERCISE);
int iWeight = c.getColumnIndex(KEY_WEIGHT);
int iSets = c.getColumnIndex(KEY_SETS);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
data = data + c.getString(iRow) + " " + c.getString(iExercise) + " " + c.getString(iWeight)
+ " " + c.getString(iSets) + "\n";
}*/
return data;
}
下面是与TextView的
public class TheView extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.theview);
TheHandler i = new TheHandler(this);
i.open();
String data = i.getData();
TextView tv = (TextView) findViewById(R.id.tvResults);
tv.setText(data);
}
}
如果需要 我可以提供更多的代码，完整处理类
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class TheHandler {
public static final String KEY_ROWID = "_id";
public static final String KEY_EXERCISE = "theexercise";
public static final String KEY_WEIGHT = "theweight";
public static final String KEY_SETS = "thesets";
private static final String DATABASE_NAME = "TheHandledb";
private static final String DATABASE_TABLE = "TheHandleTable";
private static final int DATABASE_VERSION = 2;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + DATABASE_TABLE + "("
+ KEY_ROWID + " INTEGER PRIMARY KEY," + KEY_EXERCISE + " TEXT,"
+ KEY_WEIGHT + " TEXT" + KEY_SETS + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
// Create tables again
onCreate(db);
}
}
public TheHandler(Context c) {
ourContext = c;
}
public void open() {
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
// TODO Auto-generated method stub
}
public long createEntry(String theExercise, String theWeight, String theSets) {
ContentValues cv = new ContentValues();
cv.put(KEY_EXERCISE, theExercise);
cv.put(KEY_WEIGHT, theWeight);
cv.put(KEY_SETS, theSets);
return ourDatabase.insert(DATABASE_TABLE, null,cv);
}
public void close() {
ourHelper.close();
}
public String getData() {
String data = "";
String[] columns = new String[] {KEY_ROWID, KEY_EXERCISE, KEY_WEIGHT, KEY_SETS};
/*Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
int iRow = c.getColumnIndex(KEY_ROWID);
int iExercise = c.getColumnIndex(KEY_EXERCISE);
int iWeight = c.getColumnIndex(KEY_WEIGHT);
int iSets = c.getColumnIndex(KEY_SETS);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
data = data + c.getString(iRow) + " " + c.getString(iExercise) + " " + c.getString(iWeight)
+ " " + c.getString(iSets) + "\n";
}*/
return data;
}
}
我logcat的交易类
03-26 12:19:43.988: I/Database(471): sqlite returned: error code = 1, msg = no such column: thesets
03-26 12:19:43.998: D/AndroidRuntime(471): Shutting down VM
03-26 12:19:43.998: W/dalvikvm(471): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
03-26 12:19:44.078: E/AndroidRuntime(471): FATAL EXCEPTION: main
03-26 12:19:44.078: E/AndroidRuntime(471): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.anothersql/com.example.anothersql.TheView}: android.database.sqlite.SQLiteException: no such column: thesets: , while compiling: SELECT _id, theexercise, theweight, thesets FROM TheHandleTable
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.os.Handler.dispatchMessage(Handler.java:99)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.os.Looper.loop(Looper.java:123)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-26 12:19:44.078: E/AndroidRuntime(471): at java.lang.reflect.Method.invokeNative(Native Method)
03-26 12:19:44.078: E/AndroidRuntime(471): at java.lang.reflect.Method.invoke(Method.java:521)
03-26 12:19:44.078: E/AndroidRuntime(471): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-26 12:19:44.078: E/AndroidRuntime(471): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-26 12:19:44.078: E/AndroidRuntime(471): at dalvik.system.NativeStart.main(Native Method)
03-26 12:19:44.078: E/AndroidRuntime(471): Caused by: android.database.sqlite.SQLiteException: no such column: thesets: , while compiling: SELECT _id, theexercise, theweight, thesets FROM TheHandleTable
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1345)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1229)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1184)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1264)
03-26 12:19:44.078: E/AndroidRuntime(471): at com.example.anothersql.TheHandler.getData(TheHandler.java:77)
03-26 12:19:44.078: E/AndroidRuntime(471): at com.example.anothersql.TheView.onCreate(TheView.java:16)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-26 12:19:44.078: E/AndroidRuntime(471): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-26 12:19:44.078: E/AndroidRuntime(471): ... 11 more
03-26 12:19:47.530: I/Process(471): Sending signal. PID: 471 SIG: 9
你会得到什么错误？ – Blackbelt 2013-03-26 11:12:42
粘贴你的logcat – Triode 2013-03-26 11:16:34
添加TheHandler类的代码。 – kumar 2013-03-26 11:51:52