当我的应用程序第一次加载时，数据将被添加到应用程序中，用户可以使用他/她想要的任何内容。 问题是当我向同一个表添加更多数据时，可以说我在更新中添加更多数据。 然后代码开始崩溃并告诉我:
android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
我发现我的光标为空，但我不知道为什么。
数据库未打开，我已正确关闭它。 这是我的代码:
添加到数据库部分:
public class Database {
private Dbhelper dbhelper;
SQLController dbcon;
private SQLiteDatabase database;
Context context;
public Database(Dbhelper dbhelper, SQLController dbcon, SQLiteDatabase database, Context context) {
this.dbhelper = dbhelper;
this.database = database;
this.dbcon = dbcon;
this.context = context;
}
public boolean addToDatabase() {
boolean isTrue = false;
///
try {
dbcon.open();
int plan_i = dbcon.countPlanStock().getCount();
dbcon.close();
if (plan_i < 3) {
dbcon.open();
dbcon.deletePlanSAll();
dbcon.close();
//REST = REST
dbcon.open();
dbcon.insertPlanStock("Newbie", "Free", "ic_newbie", "7 Days", "5 8 12 REST 7 REST 1", "false false false false false false false");
dbcon.close();
dbcon.open();
dbcon.insertPlanStock("Alpha 10", "Pro version", "ic_alphaten", "14 Days", "1 8 5 12 4 10 REST 11 REST 1 6 REST 2 5", "false false false false false false false false false false false false false false");
dbcon.close();
dbcon.open();
dbcon.insertPlanStock("Alpha V2", "Pro version", "ic_alphav2", "30 Days", "1 3 11 10 13 REST REST 5 4 11 12 8 REST REST 3 7 13 11 REST 13 12 REST REST 6 12 4 1 REST 12 13", "false false false false false false false false false false false false false false false false false false false false false false false false false false false false false false");
dbcon.close();
}
dbcon.open();
int workout_i = dbcon.countDataS().getCount();
dbcon.close();
if (workout_i < 17) {
dbcon.open();
dbcon.deleteAllFromStockWorkouts();
dbcon.close();
dbcon.open();
dbcon.insertDataStock("INTENSE MMA CIRCUIT", " ENDURANCE ", " DEFINITION ", " CORE ", "16min", "NO EQUIPMENT REQUIRED", "3",
"pushups uppercuts slow_pushups quick_punches",//round 1
"jump_squat_180 burpee_hill_climb short_jumps",//round 2
"leg_raises tyson_neck_raise spartan_pushups",//round 3
"",//round 4
"",//round 5
"",//round 6
"",//round 7
"",//round 8
"",//round 9
"",//round 10
"",//round 11
"",//round 12
"40000",//rest 1
"40000",//rest 2
"40000",//rest 3
"",//rest 4
"",//rest 5
"",//rest 6
"",//rest 7
"",//rest 8
"",//rest 9
"",//rest 10
"",//rest 11
"",//rest 12
"10x 30x 5x 50x",//reps round 1
"5x 10x 10x",//reps round 2
"10x 5x 10x",//reps round 3
"",//reps round 4
"",//reps round 5
"",//reps round 6
"",//reps round 7
"",//reps round 8
"",//reps round 9
"",//reps round 10
"",//reps round 11
"",//reps round 12
"intense_mma_circuit_1",//round exercises 1
"intense_mma_circuit_2",//round exercises 2
"intense_mma_circuit_3",//round exercises 3
"",//round exercises 4
"",//round exercises 5
"",//round exercises 6
"",//round exercises 7
"",//round exercises 8
"",//round exercises 9
"",//round exercises 10
"",//round exercises 11
"",//round exercises 12
"300000",//reps round 1 main
"300000",//reps round 2 main
"300000",//reps round 3 main
"",//reps round 4 main
"",//reps round 5 main
"",//reps round 6 main
"",//reps round 7 main
"",//reps round 8 main
"",//reps round 9 main
"",//reps round 10 main
"",//reps round 11 main
"",//reps round 12 main
"10",//rest exercise round 1 main
"10",//rest exercise round 2 main
"10",//rest exercise round 3 main
"",//rest exercise round 4 main
"",//rest exercise round 5 main
"",//rest exercise round 6 main
"",//rest exercise round 7 main
"",//rest exercise round 8 main
"",//rest exercise round 9 main
"",//rest exercise round 10 main
"",//rest exercise round 11 main
"",//rest exercise round 12 main
"0",//workout type
"- - -",//Exercise Rest Round 1
"- -",//Exercise Rest Round 2
"- -",//Exercise Rest Round 3
"",//Exercise Rest Round 4
"",//Exercise Rest Round 5
"",//Exercise Rest Round 6
"",//Exercise Rest Round 7
"",//Exercise Rest Round 8
"",//Exercise Rest Round 9
"",//Exercise Rest Round 10
"",//Exercise Rest Round 11
""//Exercise Rest Round 12
);
dbcon.close();
......
}
} finally {
isTrue = true;
}
return isTrue;
}
}
有一个异步任务可以处理这个问题，我只是将这个类作为助手。
事后添加数据时出现问题的Adapter类:
public class PlanAdapter extends AppCompatActivity {
private Toolbar toolbar;
private Dbhelper dbhelper;
SQLController dbcon;
private SQLiteDatabase database;
SQLController adapter;
String[] wokrouts_A;
String wokrouts_S;
public String[] isDone_A;
public String isDone_S;
public boolean isDone[];
private ProgressBar progressBar;
public int bool_counter = 0;
private String Plan_Name = "TEST";
private TextView Plan_Days_Coutner;
RecyclerView recyclerView;
PlanRecyclerAdapter ca;
int current_day = 0;
String[] workout_name_shortener;
private DBhelper dbhelper_l;
private SQLiteDatabase database_l;
SQLiteController dbcon_l;
String date = new SimpleDateFormat("d.M.yyyy").format(new Date());
ProgressBar pm_navigation;
List<Integer> Tab_Colour = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.plan_adapter);
adapter = new SQLController(this);
dbcon = new SQLController(this);
dbhelper = new Dbhelper(this);
database = dbhelper.getWritableDatabase();
dbcon_l = new SQLiteController(this);
dbhelper_l = new DBhelper(this);
database_l = dbhelper_l.getWritableDatabase();
Intent intent = getIntent();
Plan_Name = intent.getStringExtra("plan_info");
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Typeface faceRobotoMedium = Typeface.createFromAsset(getResources().getAssets(), "Roboto-Medium.ttf");
TextView TitleBarCustom = (TextView) findViewById(R.id.toolbar_title);
TitleBarCustom.setTypeface(faceRobotoMedium);
TitleBarCustom.setText("" + Plan_Name);
getSupportActionBar().setTitle(null);
Plan_Days_Coutner = (TextView) findViewById(R.id.plan_coutner_id);
Plan_Days_Coutner.setTypeface(faceRobotoMedium);
recyclerView = (RecyclerView) findViewById(R.id.recyclerList);
LinearLayoutManager llm = new LinearLayoutManager(this);
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
ca = new PlanRecyclerAdapter(generateWorkouts(), isDone, bool_counter, Plan_Name, getApplicationContext(), dbhelper, dbcon, database);
//ca.setClickListener(this);
recyclerView.setAdapter(ca);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setProgress(current_day);
progressBar.setMax(isDone.length);
if (current_day == isDone.length) {
Plan_Days_Coutner.setText("" + isDone.length + " DAYS" + " PLAN COMPLETED");
} else {
Plan_Days_Coutner.setText("DAY " + current_day + "/" + isDone.length);
}
for (boolean n : isDone) {
Log.d("Seud", "_" + n);
}
}
private ArrayList<PlanRecycler> generateWorkouts() {
ArrayList<PlanRecycler> palettes = new ArrayList<>();
String[] allColumns = new String[]{Dbhelper.PLAN_ID,
Dbhelper.PLAN_NAME,
Dbhelper.PLAN_UNDER_TEXT,
Dbhelper.PLAN_DURATION,
Dbhelper.PLAN_IMAGE,
Dbhelper.PLAN_WOKROUTS_ID,
Dbhelper.PLAN_IS_FINISHED
};
Cursor cursor_s = database.query(Dbhelper.TABLE_PLAN_STOCK, allColumns, "_name=\'" + Plan_Name + "\'", null, null, null, null, "1");
if (cursor_s != null) {
cursor_s.moveToFirst();
wokrouts_S = cursor_s.getString(5);
isDone_S = cursor_s.getString(6);
}
try {
wokrouts_A = wokrouts_S.split("\\s+");
Log.d("Workouts_name", "" + wokrouts_A);
} catch (PatternSyntaxException ex) {
}
try {
isDone_A = isDone_S.split("\\s+");
} catch (PatternSyntaxException ex) {
}
Boolean_Generator(isDone_A);
if (cursor_s.moveToFirst()) {
do {
for (int i = 0; i < wokrouts_A.length; i++) {
palettes.add(new PlanRecycler(
Workout_Name(wokrouts_A[i]), Workout_Name_Holder(wokrouts_A[i]), Tab_Colour.get(i)
));
}
} while (cursor_s.moveToNext());
}
cursor_s.close();
return palettes;
}
//Workout Name Decider
public String Workout_Name_Holder(String id_S) {
String workout_name = "";
if (id_S.equals("REST")) {
workout_name = "Rest";
} else {
String[] allColumns = new String[]{
Dbhelper.WORKOUTS_ID,
Dbhelper.WORKOUT_NAME,
};
Cursor cursor = database.query(Dbhelper.TABLE_WORKOUTS_STOCK, allColumns, "_id=\'" + id_S + "\'", null, null, null, null, "1");
if( cursor != null && cursor.moveToFirst() ){
workout_name = cursor.getString(1);
cursor.close();
}
/*
if (cursor != null) {
cursor.moveToFirst();
//id = cursor.getString(2);
workout_name = cursor.getString(1);
}
cursor.close();
*/
}
return workout_name;
}
//Workout Name Decider
public String Workout_Name(String id_S) {
String workout_name = "";
String template = "";
String holder = "";
if (id_S.equals("REST")) {
workout_name = "Rest";
} else {
String[] allColumns = new String[]{
Dbhelper.WORKOUTS_ID,
Dbhelper.WORKOUT_NAME,
Dbhelper.WORKOUT_TIME
};
Cursor cursor = database.query(Dbhelper.TABLE_WORKOUTS_STOCK, allColumns, "_id=\'" + id_S + "\'", null, null, null, null, "1");
if( cursor != null && cursor.moveToFirst() ){
Log.d("Cursor_info","not_null");
if (cursor.getString(1).contains("SPARTAN SPECIALE ADVANCED") || cursor.getString(1).contains("SPARTAN SPECIALE BEGINNER") || cursor.getString(1).contains("TRICEPS SMASHER REPS")) {
template = "(reps)";
} else {
template = "(" + cursor.getString(2) + ")";
}
}else{
Log.d("Cursor_info","null");
}
try {
workout_name_shortener = cursor.getString(1).split("\\s+");
cursor.close();
int counter = 0;
for (int i = 0; i < workout_name_shortener.length; i++) {
if (workout_name_shortener[i].equals("TIMER") || workout_name_shortener[i].equals("REPS") || workout_name_shortener[i].equals("ADVANCED") || workout_name_shortener[i].equals("BEGINNER") && counter != 0) {
break;
} else {
holder += workout_name_shortener[i] + " ";
}
counter++;
}
}catch (Exception e){
Log.d("Exception_log",""+e);
}
workout_name = holder + template;
//cursor.close();
}
return workout_name;
}
public void Boolean_Generator(String[] boolean_S) {
int counter = 0;
isDone = new boolean[boolean_S.length];
for (int i = 0; i < boolean_S.length; i++) {
if (boolean_S[i].equals("true")) {
bool_counter++;
isDone[i] = Boolean.TRUE;
Tab_Colour.add(getResources().getColor(R.color.siva_3));
} else {
if(counter<1){
Tab_Colour.add(getResources().getColor(R.color.siva_1));
}else{
Tab_Colour.add(getResources().getColor(R.color.siva_2));
}
counter++;
isDone[i] = Boolean.FALSE;
}
}
for (int i = 0; i < isDone.length; i++) {
Log.d("bools_a", "" + isDone[i]);
if (isDone[i] == true) {
current_day++;
}
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
back_pressed();
return true;
case R.id.action_renew:
Toast.makeText(this, "Plan renewed", Toast.LENGTH_SHORT).show();
dbcon.open();
if(Plan_Name.equals("Newbie")){
dbcon.updatePlanStock("Newbie", "UNDER TEXT", "ic_newbie", "7 Days", "5 8 12 REST 7 REST 1", "false false false false false false false");
}else if(Plan_Name.equals("Alpha 10")){
dbcon.updatePlanStock("Alpha 10", "UNDER TEXT", "ic_alphaten", "14 Days", "1 2 3 4 5 6 7 8 9 10", "false false false false false false false false false false");
}else if(Plan_Name.equals("Alpha V2")){
dbcon.updatePlanStock("Alpha V2", "Pro version", "ic_alphav2", "30 Days", "1 3 11 10 13 REST REST 5 4 11 12 8 REST REST 3 7 13 11 REST 13 12 REST REST 6 12 4 1 REST 12 13", "false false false false false false false false false false false false false false false false false false false false false false false false false false false false false false");
}
dbcon.close();
dbcon_l.open();
dbcon_l.insertData("" + Plan_Name + " Plan", "" + date);
dbcon_l.close();
Bundle ExerciseBundle = new Bundle();
ExerciseBundle.putString("plan_info", Plan_Name);
Intent i = new Intent(/* FirstActivity.this */
getApplicationContext(),
PlanAdapter.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtras(ExerciseBundle);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
public boolean onCreateOptionsMenu(Menu menu) {
if (current_day == isDone.length) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_delete, menu);
}
return true;
}
@Override
public void onBackPressed() {
super.onBackPressed();
back_pressed();
}
public void back_pressed() {
Intent test = new Intent(getApplication(), MainActivity.class);
test.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(test);
}
}
附加日志猫:
Process: com.spartanbodyweightworkouts, PID: 14142 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.spartanbodyweightworkouts/com.spartanbodyweightworkouts.tabs.plan.planAdapter.planAdapter.PlanAdapter}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0 at android.database.AbstractCursor.checkPosition(AbstractCursor.java:460) at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136) at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50) at com.spartanbodyweightworkouts.tabs.plan.planAdapter.planAdapter.PlanAdapter.Workout_Name(PlanAdapter.java:247) at com.spartanbodyweightworkouts.tabs.plan.planAdapter.planAdapter.PlanAdapter.generateWorkouts(PlanAdapter.java:174) at com.spartanbodyweightworkouts.tabs.plan.planAdapter.planAdapter.PlanAdapter.onCreate(PlanAdapter.java:109) at android.app.Activity.performCreate(Activity.java:6251) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
最佳答案
在代码底部，您已注释掉 cursor.close;。
Cursor cursor = database.query(Dbhelper.TABLE_WORKOUTS_STOCK, allColumns, "_id=\'" + id_S + "\'", null, null, null, null, "1");
if( cursor != null && cursor.moveToFirst() ){
.../...
workout_name = holder + template;
//cursor.close();
您关闭得太早，如果 try 和 catch 失败，您还需要检查光标是否已关闭。在“如果”或“尝试”的情况下，保持资源整洁是一个好主意。
<小时/>public String Workout_Name(String id_S) {
String workout_name = "";
String template = "";
String holder = "";
if (id_S.equals("REST")) {
workout_name = "Rest";
} else {
String[] allColumns = new String[]{
Dbhelper.WORKOUTS_ID,
Dbhelper.WORKOUT_NAME,
Dbhelper.WORKOUT_TIME
};
Cursor cursor = database.query(Dbhelper.TABLE_WORKOUTS_STOCK, allColumns, "_id=\'" + id_S + "\'", null, null, null, null, "1");
if( cursor != null && cursor.moveToFirst() ){
Log.d("Cursor_info","not_null");
if (cursor.getString(1).contains("SPARTAN SPECIALE ADVANCED") || cursor.getString(1).contains("SPARTAN SPECIALE BEGINNER") || cursor.getString(1).contains("TRICEPS SMASHER REPS")) {
template = "(reps)";
} else {
template = "(" + cursor.getString(2) + ")";
}
}else{
Log.d("Cursor_info","null");
}
try {
workout_name_shortener = cursor.getString(1).split("\\s+");
cursor.close();
int counter = 0;
for (int i = 0; i < workout_name_shortener.length; i++) {
if (workout_name_shortener[i].equals("TIMER") || workout_name_shortener[i].equals("REPS") || workout_name_shortener[i].equals("ADVANCED") || workout_name_shortener[i].equals("BEGINNER") && counter != 0) {
break;
} else {
holder += workout_name_shortener[i] + " ";
}
counter++;
}
}catch (Exception e){
Log.d("Exception_log",""+e);
}
workout_name = holder + template;
//cursor.close();
}
return workout_name;
}
我建议在您的应用程序中使用 sqlite 助手的单个实例。请查看此处了解更多详细信息:
关于java - 向数据库添加数据后光标为空，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37365258/