我有一个改变DB值字段的按钮。我希望在ListView显示所有具有一定价值的字段（顶部，在我的例子中）。我知道，我做错了什么，但不知道什么。
MainActivity：
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
Button btnadd;
LinearLayout llMain;
Time today = new Time(Time.getCurrentTimezone());
DBAdapter myDb;
ImageButton imgStar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.hide();
btnadd = (Button) findViewById(R.id.button);
//llMain = (LinearLayout) findViewById(R.id.llMain);
btnadd.setOnClickListener(this);
openDB();
populateListView();
imgStar = (ImageButton)findViewById(R.id.imageButton2);
imgStar.setOnClickListener(this);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
Intent intent = new Intent(this, result.class);
startActivityForResult(intent, 1);
break;
case R.id.imageButton2:
ifTop();
break;
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
String name = data.getStringExtra("task");
String grup = data.getStringExtra("grup");
today.setToNow();
String timestamp = today.format("%Y-%m-%d %H:%M:%S");
myDb.insertRow(name,timestamp,grup);
populateListView();
}
private void openDB(){
myDb = new DBAdapter(this);
myDb.open();
}
private void populateListView() {
Cursor cursor = myDb.getAllRows();
String[] fromFieldNames = new String[]{DBAdapter.KEY_ROWID,DBAdapter.KEY_TASK};
int[] toViewIDs = new int[]{R.id.textView3,R.id.textView6};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getBaseContext(),R.layout.item_layout,cursor,fromFieldNames,toViewIDs,0);
ListView myList = (ListView) findViewById(R.id.listView);
myList.setAdapter(myCursorAdapter);
}
private void ifTop(){
Cursor c = myDb.ifTopViews();
String[] fromFieldNames = new String[]{DBAdapter.KEY_ROWID,DBAdapter.KEY_TASK};
int[] toViewIDs = new int[]{R.id.textView3,R.id.textView6};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getBaseContext(),R.layout.item_layout,c,fromFieldNames,toViewIDs,0);
ListView myList = (ListView) findViewById(R.id.listView);
myList.setAdapter(myCursorAdapter);
}
}
结果：
public class result extends ActionBarActivity implements View.OnClickListener {
EditText etName;
Button btnOk;
EditText etData;
boolean bIcon = true;
ImageButton star;
String grup;
Intent intent = new Intent();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
ActionBar actionBar = getSupportActionBar();
actionBar.hide();
etName = (EditText) findViewById(R.id.editText);
btnOk = (Button) findViewById(R.id.button2);
star = (ImageButton) findViewById(R.id.imageButton);
btnOk.setOnClickListener(this);
star.setOnClickListener(this);
}
@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_result, 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);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button2:
intent.putExtra("task", etName.getText().toString());
setResult(RESULT_OK, intent);
finish();
break;
case R.id.imageButton:
if (bIcon) {
star.setImageResource(R.drawable.star1);
grup = "top";
}
else
{
star.setImageResource(R.drawable.star);
grup = null;
}
intent.putExtra("grup",grup);
bIcon = !bIcon;
break;
}
}
}
DBAdapter（并非所有，只是不起作用的东西）：
public Cursor ifTopViews() {
String where = KEY_GRUPS+"="+ "top";
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
错误：
06-15 20:47:26.487 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:47:26.497 7684-7684/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:32.714 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:47:33.094 7726-7726/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:35.477 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:47:35.998 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 20:47:38.750 19244-19294/? E/ExternalAccountType﹕ Unsupported attribute readOnly
06-15 20:47:39.111 7808-7808/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:39.361 19244-19294/? E/ExternalAccountType﹕ Unsupported attribute readOnly
06-15 20:47:39.631 7824-7824/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:39.772 7838-7838/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:39.882 1231-1231/? E/NetworkScheduler.SchedulerReceiver﹕ Invalid parameter app
06-15 20:47:39.882 1231-1231/? E/NetworkScheduler.SchedulerReceiver﹕ Invalid package name : Perhaps you didn't include a PendingIntent in the extras?
06-15 20:47:40.122 7868-7868/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:40.172 7868-7868/? E/dalvikvm﹕ Could not find class 'android.app.Notification$Action$Builder', referenced from method b.a
06-15 20:47:40.192 7868-7868/? E/dalvikvm﹕ Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method b.a
06-15 20:47:40.282 7868-7868/? E/dalvikvm﹕ Could not find class 'android.app.Notification$Action$Builder', referenced from method b.a
06-15 20:47:40.302 7868-7868/? E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method b.a
06-15 20:47:40.302 7868-7868/? E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method b.a
06-15 20:47:40.312 7868-7868/? E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method b.a
06-15 20:47:40.342 7868-7868/? E/dalvikvm﹕ Could not find class 'android.app.RemoteInput[]', referenced from method b.a
06-15 20:47:40.352 7868-7868/? E/dalvikvm﹕ Could not find class 'android.transition.Transition', referenced from method b.b
06-15 20:47:40.392 631-660/? E/power﹕ Can not write CPU_PERF_LEVEL_LOCK. (Invalid argument)
06-15 20:47:40.542 7887-7887/com.example.user.campus E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:40.663 631-993/? E/Surface﹕ Invalid SurfaceControl
06-15 20:47:40.903 7907-7907/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:41.634 7937-7937/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:41.704 7951-7951/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:41.794 7966-7966/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:42.004 7983-7983/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:42.184 904-1051/? E/Prism.WidgetManager﹕ The same lists. No need to update. skip it.
06-15 20:47:42.314 8009-8009/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:42.384 631-660/? E/power﹕ request perf lock level(0) is invalid. (Invalid argument)
06-15 20:47:42.494 8032-8032/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:42.575 1231-1231/? E/NetworkScheduler.SchedulerReceiver﹕ Invalid parameter app
06-15 20:47:42.575 1231-1231/? E/NetworkScheduler.SchedulerReceiver﹕ Invalid package name : Perhaps you didn't include a PendingIntent in the extras?
06-15 20:47:42.695 8048-8048/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:42.775 8066-8066/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:43.015 1231-1231/? E/AuthorizationBluetoothService﹕ Proximity feature is not enabled.
06-15 20:47:43.225 7887-7887/com.example.user.campus E/SQLiteLog﹕ (1) no such column: top
06-15 20:47:43.235 7887-7887/com.example.user.campus E/AndroidRuntime﹕ FATAL EXCEPTION: main
android.database.sqlite.SQLiteException: no such column: top (code 1): , while compiling: SELECT DISTINCT _id, task, date, grup FROM mainToDo WHERE grup=top
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:909)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:520)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:65)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1370)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1217)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1088)
at com.example.user.campus.DBAdapter.ifTopViews(DBAdapter.java:101)
at com.example.user.campus.MainActivity.ifTop(MainActivity.java:127)
at com.example.user.campus.MainActivity.onClick(MainActivity.java:91)
at android.view.View.performClick(View.java:4231)
at android.view.View$PerformClick.run(View.java:17537)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
at dalvik.system.NativeStart.main(Native Method)
06-15 20:47:43.245 631-659/? E/EmbeddedLogger﹕ App crashed! Process: com.example.user.campus
06-15 20:47:43.245 631-659/? E/EmbeddedLogger﹕ App crashed! Package: com.example.user.campus v1 (1.0)
06-15 20:47:43.245 631-659/? E/EmbeddedLogger﹕ Application Label: Campus
06-15 20:47:43.786 631-1441/? E/Surface﹕ Invalid SurfaceControl
06-15 20:47:43.916 8093-8093/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:47:44.006 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 20:47:44.537 631-702/? E/InputDispatcher﹕ channel '42eafd38 com.example.user.campus/com.example.user.campus.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
06-15 20:47:45.017 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 9
06-15 20:47:53.867 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:47:54.027 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 20:47:57.130 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:00.113 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:02.966 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:04.047 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 20:48:04.938 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:05.049 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 102
06-15 20:48:49.336 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:52.830 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:52.850 8256-8256/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:48:56.393 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:56.523 235-235/? E/AudioPolicyManagerBase﹕ getOutput() IOProfile is null.
06-15 20:48:56.523 235-235/? E/AudioPolicyManagerBase﹕ getOutput() IOProfile is null.
06-15 20:48:56.523 235-235/? E/AudioPolicyManagerBase﹕ getOutput() IOProfile is null.
06-15 20:48:56.523 235-235/? E/AudioPolicyManagerBase﹕ getOutput() IOProfile is null.
06-15 20:48:57.585 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:48:58.886 235-8300/? E/MP3Extractor﹕ Unable to resync. Signalling end of stream.
06-15 20:49:00.117 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:35.605 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:37.577 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:38.218 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 102 to 9
06-15 20:49:38.228 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:42.833 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:43.233 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 3
06-15 20:49:44.935 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:45.235 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 15
06-15 20:49:45.686 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:46.237 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:51.402 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:52.253 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 20:49:58.329 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:49:59.260 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 20:50:05.918 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:06.268 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 20:50:06.368 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:37.101 8611-8611/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:50:37.111 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:37.371 8640-8640/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 20:50:39.193 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:39.333 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 20:50:39.543 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:43.428 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:51.756 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:52.357 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 20:50:53.709 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:50:54.359 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 102
06-15 20:51:47.676 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:51:52.701 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:52:00.109 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:52:43.095 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:52:43.576 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 102 to 3
06-15 20:52:44.577 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 9
06-15 20:53:54.812 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:53:55.723 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 3
06-15 20:53:56.343 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:53:56.714 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 15
06-15 20:54:03.021 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:54:03.731 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 20:55:37.702 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 20:56:00.105 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
答案 0 :(得分：2)
在你的查询＆＃34; SELECT DISTINCT _id，task，date，grup FROM mainToDo WHERE grup = top＆＃34;在引用文本值（顶部）时，您没有使用引号。它应该在引号之间，否则SQL将不会将其识别为字符串值。
正确查询：SELECT DISTINCT _id，task，date，grup FROM mainToDo WHERE grup =＆＃39; top＆＃39;;
在结果类中使用：
if (bIcon) {
star.setImageResource(R.drawable.star1);
grup = "'top'";
}