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当我尝试在 onTick() 中设置文本时出现 NullPointerException,我的代码如下。
public class TrainingProcessFragent extends SherlockFragment implements
OnClickListener {
public TextView text;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_training_process, null);
text = (TextView) v.findViewById(R.id.tvTimer1);
text.setText(" " + min + " : " + sec);
text.setOnClickListener(this);
showCurrentSituation();
return v;
}
@Override
public void onClick(View v) {
db.open();
Intent intent;
switch (v.getId()) {
case R.id.tvTimer1:
showDialog();
break;
}
}
public void doPositiveClick(long time) {
DialogFlag = 0;
startTime = time;
Log.d("myLogs", String.valueOf(startTime));
countDownTimer = new MyCountDownTimer(startTime, 1000);
countDownTimer.start();
// dialog.cancel();
}
public void doNegativeClick() {
DialogFlag = 1;
}
void showDialog() {
newFragment.show(getFragmentManager(), "dialog");
}
public void onStop() {
db.close();
super.onStop();
}
public class MyCountDownTimer extends CountDownTimer {
public MyCountDownTimer(long startTime, long interval) {
super(startTime, interval);
}
@Override
public void onFinish() {
text.setText("Time's up!");
}
@Override
public void onTick(long millisUntilFinished) {
millisUntilFinished /= 1000;
// hour = Long.toString(temp / 3600);
min = Long.toString((millisUntilFinished) / 60);
sec = Long.toString(millisUntilFinished - Long.valueOf(min) * 60);
if (sec.length() == 1) {
sec = "0" + sec;
}
if (min.length() == 1) {
min = "0" + min;
}
text.setText(" " + min + " : " + sec);//ERROR
Log.d("myLogs", " " + min + " : " + sec);// All is correct
// text.setText("" + millisUntilFinished / 1000);
}
}
布局代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="59dp" >
<TextView
android:id="@+id/tv_ex_name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="4.94"
android:gravity="center"
android:textColor="#4f4f4f"
android:textSize="20sp"
android:textStyle="bold" />
<ImageButton
android:id="@+id/imb_ex_info"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:background="@android:color/transparent"
android:scaleType="fitCenter"
android:src="@drawable/btn_info" />
<ImageButton
android:id="@+id/imbtn_history"
android:layout_width="50dp"
android:layout_height="match_parent"
android:background="@android:color/transparent"
android:scaleType="fitCenter"
android:src="@drawable/btn_calendar" />
<TextView
android:id="@+id/tvTimer1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="4.94"
android:background="@color/abs__holo_blue_light"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Поточна вправа:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_current_exercise_num"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#4f4f4f"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Номер підходу"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_current_set"
android:layout_width="198dp"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#4f4f4f"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Необхідно зробити "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/tv_repeats"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#4f4f4f"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="@+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=" повторень"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/pr_date"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="Вага "
android:textSize="25sp"
android:textStyle="bold" />
<Spinner
android:id="@+id/spinner_weigth"
android:layout_width="155dp"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/pr_weigth"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="Повторення "
android:textSize="25sp"
android:textStyle="bold" />
<Spinner
android:id="@+id/spinner_repeats"
android:layout_width="155dp"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/btn_next_set"
android:layout_width="match_parent"
android:layout_height="93dp"
android:layout_marginTop="20dp"
android:background="@android:color/transparent"
android:scaleType="fitCenter"
android:src="@drawable/btn_next" />
</LinearLayout>
</LinearLayout>
堆栈跟踪:
08-02 12:50:19.954: I/dalvikvm(2274): Could not find method com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout.onHoverEvent, referenced from method com.actionbarsherlock.internal.widget.ActionBarContainer.onHoverEvent
08-02 12:50:19.975: W/dalvikvm(2274): VFY: unable to resolve virtual method 5970: Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineFrameLayout;.onHoverEvent (Landroid/view/MotionEvent;)Z
08-02 12:50:19.975: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x0000
08-02 12:50:19.975: D/dalvikvm(2274): VFY: dead code 0x0003-0004 in Lcom/actionbarsherlock/internal/widget/ActionBarContainer;.onHoverEvent (Landroid/view/MotionEvent;)Z
08-02 12:50:20.004: I/dalvikvm(2274): Could not find method android.widget.FrameLayout.getAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout.getAlpha
08-02 12:50:20.004: W/dalvikvm(2274): VFY: unable to resolve virtual method 4637: Landroid/widget/FrameLayout;.getAlpha ()F
08-02 12:50:20.004: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:20.004: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineFrameLayout;.getAlpha ()F
08-02 12:50:20.004: I/dalvikvm(2274): Could not find method android.widget.FrameLayout.getTranslationY, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout.getTranslationY
08-02 12:50:20.004: W/dalvikvm(2274): VFY: unable to resolve virtual method 4638: Landroid/widget/FrameLayout;.getTranslationY ()F
08-02 12:50:20.004: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:20.004: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineFrameLayout;.getTranslationY ()F
08-02 12:50:20.014: I/dalvikvm(2274): Could not find method android.widget.FrameLayout.setAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout.setAlpha
08-02 12:50:20.014: W/dalvikvm(2274): VFY: unable to resolve virtual method 4641: Landroid/widget/FrameLayout;.setAlpha (F)V
08-02 12:50:20.014: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:20.014: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineFrameLayout;.setAlpha (F)V
08-02 12:50:20.014: I/dalvikvm(2274): Could not find method android.widget.FrameLayout.setTranslationY, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout.setTranslationY
08-02 12:50:20.014: W/dalvikvm(2274): VFY: unable to resolve virtual method 4649: Landroid/widget/FrameLayout;.setTranslationY (F)V
08-02 12:50:20.014: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:20.014: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineFrameLayout;.setTranslationY (F)V
08-02 12:50:20.054: I/dalvikvm(2274): Could not find method android.view.ViewGroup.getAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.getAlpha
08-02 12:50:20.054: W/dalvikvm(2274): VFY: unable to resolve virtual method 4366: Landroid/view/ViewGroup;.getAlpha ()F
08-02 12:50:20.054: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:20.054: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.getAlpha ()F
08-02 12:50:20.054: I/dalvikvm(2274): Could not find method android.view.ViewGroup.getTranslationX, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.getTranslationX
08-02 12:50:20.064: W/dalvikvm(2274): VFY: unable to resolve virtual method 4377: Landroid/view/ViewGroup;.getTranslationX ()F
08-02 12:50:20.064: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:20.064: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.getTranslationX ()F
08-02 12:50:20.064: I/dalvikvm(2274): Could not find method android.view.ViewGroup.getTranslationY, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.getTranslationY
08-02 12:50:20.064: W/dalvikvm(2274): VFY: unable to resolve virtual method 4378: Landroid/view/ViewGroup;.getTranslationY ()F
08-02 12:50:20.064: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:20.074: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.getTranslationY ()F
08-02 12:50:20.074: I/dalvikvm(2274): Could not find method android.view.ViewGroup.setAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.setAlpha
08-02 12:50:20.074: W/dalvikvm(2274): VFY: unable to resolve virtual method 4400: Landroid/view/ViewGroup;.setAlpha (F)V
08-02 12:50:20.074: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:20.074: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.setAlpha (F)V
08-02 12:50:20.074: I/dalvikvm(2274): Could not find method android.view.ViewGroup.setTranslationX, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.setTranslationX
08-02 12:50:20.074: W/dalvikvm(2274): VFY: unable to resolve virtual method 4405: Landroid/view/ViewGroup;.setTranslationX (F)V
08-02 12:50:20.074: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:20.074: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.setTranslationX (F)V
08-02 12:50:20.074: I/dalvikvm(2274): Could not find method android.view.ViewGroup.setTranslationY, referenced from method com.actionbarsherlock.internal.nineoldandroids.view.NineViewGroup.setTranslationY
08-02 12:50:20.074: W/dalvikvm(2274): VFY: unable to resolve virtual method 4406: Landroid/view/ViewGroup;.setTranslationY (F)V
08-02 12:50:20.074: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:20.084: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/view/NineViewGroup;.setTranslationY (F)V
08-02 12:50:20.234: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 116K, 49% free 2806K/5447K, external 1537K/1559K, paused 125ms
08-02 12:50:20.335: I/dalvikvm(2274): Could not find method com.actionbarsherlock.internal.widget.ActionBarView$HomeView.onHoverEvent, referenced from method com.actionbarsherlock.internal.widget.ActionBarView$HomeView.dispatchHoverEvent
08-02 12:50:20.335: W/dalvikvm(2274): VFY: unable to resolve virtual method 6831: Lcom/actionbarsherlock/internal/widget/ActionBarView$HomeView;.onHoverEvent (Landroid/view/MotionEvent;)Z
08-02 12:50:20.335: D/dalvikvm(2274): VFY: replacing opcode 0x6e at 0x0000
08-02 12:50:20.335: D/dalvikvm(2274): VFY: dead code 0x0003-0004 in Lcom/actionbarsherlock/internal/widget/ActionBarView$HomeView;.dispatchHoverEvent (Landroid/view/MotionEvent;)Z
08-02 12:50:20.335: I/dalvikvm(2274): Could not find method android.widget.FrameLayout.onPopulateAccessibilityEvent, referenced from method com.actionbarsherlock.internal.widget.ActionBarView$HomeView.onPopulateAccessibilityEvent
08-02 12:50:20.345: W/dalvikvm(2274): VFY: unable to resolve virtual method 4640: Landroid/widget/FrameLayout;.onPopulateAccessibilityEvent (Landroid/view/accessibility/AccessibilityEvent;)V
08-02 12:50:20.345: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x0006
08-02 12:50:20.545: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 42K, 49% free 2831K/5447K, external 2067K/2370K, paused 46ms
08-02 12:50:20.675: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 9K, 48% free 2839K/5447K, external 2431K/2822K, paused 63ms
08-02 12:50:20.845: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 10K, 48% free 2848K/5447K, external 3592K/4441K, paused 45ms
08-02 12:50:21.384: D/myLogs(2274): true
08-02 12:50:21.394: D/myLogs(2274): true
08-02 12:50:21.605: I/dalvikvm(2274): Could not find method android.view.View.jumpDrawablesToCurrentState, referenced from method com.actionbarsherlock.internal.view.menu.BaseMenuPresenter.updateMenuView
08-02 12:50:21.605: W/dalvikvm(2274): VFY: unable to resolve virtual method 4273: Landroid/view/View;.jumpDrawablesToCurrentState ()V
08-02 12:50:21.605: D/dalvikvm(2274): VFY: replacing opcode 0x6e at 0x0056
08-02 12:50:21.614: I/dalvikvm(2274): Could not find method android.widget.LinearLayout.getAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineLinearLayout.getAlpha
08-02 12:50:21.614: W/dalvikvm(2274): VFY: unable to resolve virtual method 4692: Landroid/widget/LinearLayout;.getAlpha ()F
08-02 12:50:21.624: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:21.624: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineLinearLayout;.getAlpha ()F
08-02 12:50:21.624: I/dalvikvm(2274): Could not find method android.widget.LinearLayout.getTranslationX, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineLinearLayout.getTranslationX
08-02 12:50:21.624: W/dalvikvm(2274): VFY: unable to resolve virtual method 4695: Landroid/widget/LinearLayout;.getTranslationX ()F
08-02 12:50:21.624: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000b
08-02 12:50:21.624: D/dalvikvm(2274): VFY: dead code 0x000e-000f in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineLinearLayout;.getTranslationX ()F
08-02 12:50:21.624: I/dalvikvm(2274): Could not find method android.widget.LinearLayout.setAlpha, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineLinearLayout.setAlpha
08-02 12:50:21.624: W/dalvikvm(2274): VFY: unable to resolve virtual method 4707: Landroid/widget/LinearLayout;.setAlpha (F)V
08-02 12:50:21.624: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:21.624: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineLinearLayout;.setAlpha (F)V
08-02 12:50:21.624: I/dalvikvm(2274): Could not find method android.widget.LinearLayout.setTranslationX, referenced from method com.actionbarsherlock.internal.nineoldandroids.widget.NineLinearLayout.setTranslationX
08-02 12:50:21.624: W/dalvikvm(2274): VFY: unable to resolve virtual method 4713: Landroid/widget/LinearLayout;.setTranslationX (F)V
08-02 12:50:21.624: D/dalvikvm(2274): VFY: replacing opcode 0x6f at 0x000a
08-02 12:50:21.624: D/dalvikvm(2274): VFY: dead code 0x000d-000d in Lcom/actionbarsherlock/internal/nineoldandroids/widget/NineLinearLayout;.setTranslationX (F)V
08-02 12:50:21.644: W/KeyCharacterMap(2274): No keyboard for id -1
08-02 12:50:21.644: W/KeyCharacterMap(2274): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
08-02 12:50:21.684: D/gralloc_goldfish(2274): Emulator without GPU emulation detected.
08-02 12:50:21.785: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 35K, 47% free 2941K/5511K, external 7087K/7483K, paused 57ms
08-02 12:50:23.404: D/dalvikvm(2274): GC_EXTERNAL_ALLOC freed 18K, 47% free 2938K/5511K, external 7057K/8813K, paused 52ms
08-02 12:50:23.745: D/myLogs(2274): onCreateView
08-02 12:50:23.815: D/myLogs(2274): set=1
08-02 12:50:23.825: D/myLogs(2274): 1 ( 12 12 12 12 )
08-02 12:50:23.825: D/myLogs(2274): 2 ( 15 15 )
08-02 12:50:23.825: D/myLogs(2274): 6 ( 12 12 12 12 )
08-02 12:50:23.825: D/myLogs(2274): 18 ( 15 15 )
08-02 12:50:25.771: D/myLogs(2274): Заебись
08-02 12:50:25.828: D/myLogs(2274): Заебись
08-02 12:50:25.966: D/myLogs(2274): Заебись
08-02 12:50:26.785: D/myLogs(2274): 62000
08-02 12:50:26.795: D/AndroidRuntime(2274): Shutting down VM
08-02 12:50:26.795: W/dalvikvm(2274): threadid=1: thread exiting with uncaught exception (group=0xb5feb4f0)
08-02 12:50:26.805: E/AndroidRuntime(2274): FATAL EXCEPTION: main
08-02 12:50:26.805: E/AndroidRuntime(2274): java.lang.NullPointerException
08-02 12:50:26.805: E/AndroidRuntime(2274): at com.example.gymforyou01.TrainingProcessFragent$MyCountDownTimer.onTick(TrainingProcessFragent.java:369)
08-02 12:50:26.805: E/AndroidRuntime(2274): at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:124)
08-02 12:50:26.805: E/AndroidRuntime(2274): at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 12:50:26.805: E/AndroidRuntime(2274): at android.os.Looper.loop(Looper.java:130)
08-02 12:50:26.805: E/AndroidRuntime(2274): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-02 12:50:26.805: E/AndroidRuntime(2274): at java.lang.reflect.Method.invokeNative(Native Method)
08-02 12:50:26.805: E/AndroidRuntime(2274): at java.lang.reflect.Method.invoke(Method.java:507)
08-02 12:50:26.805: E/AndroidRuntime(2274): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-02 12:50:26.805: E/AndroidRuntime(2274): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-02 12:50:26.805: E/AndroidRuntime(2274): at dalvik.system.NativeStart.main(Native Method)
最佳答案
请确保您在行中有正确的 R
:
text = (TextView) v.findViewById(R.id.tvTimer1);
有时您会获得默认的 R
而不是来自您的 gen
文件夹。
另一方面,确保在 onTick
之前调用 onCreateView
或者:
验证布局 XML 包含名为 tvTimer1
的 TextView。
关于android - 当我尝试在 TextView 中设置文本()时出现 NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18018328/
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因此,我提示用户输入变量。如果变量小于 0 且大于 10。如果用户输入 10,我想要求用户再次输入数字。我问时间的时候输入4,它说你输入错误。但在第二次尝试时效果很好。例如:如果我输入 25,它会打印
我已经用 css overflow 属性做了一个例子。在这个例子中我遇到了一个溢出滚动的问题。滚动条出现了,但没有工作意味着每当将光标移动到滚动条时,在这个滚动条不活动的时间。我对此一无所知,所以请帮
我现在正在做一个元素。当您单击一个元素时,会出现以下信息,我想知道如何在您单击下一个元素而不重新单击同一元素时使其消失....例如,我的元素中有披萨,我想单击肉披萨看到浇头然后点击奶酪披萨看到浇头和肉
我有一个路由器模块,它将主题与正则表达式进行比较,并将出现的事件与一致的键掩码链接起来。 (它是一个简单的 url 路由过滤,如 symfony http://symfony.com/doc/curr
这个问题在这里已经有了答案: 9年前关闭。 Possible Duplicate: mysql_fetch_array() expects parameter 1 to be resource, bo
我在底部有一个带有工具栏的 View ,我正在使用 NavigationLink 导航到该 View 。但是当 View 出现时,工具栏显示得有点太低了。大约半秒钟后,它突然跳到位。它只会在应用程序启
我试图在我的应用程序上为背景音乐添加一个 AVAudioPlayer,我正在主屏幕上启动播放器,尝试在应用程序打开时开始播放但出现意外行为... 它播放并立即不断创建新玩家并播放这些玩家,因此同时播放
这是获取一个数字,获取其阶乘并将其加倍,但是由于基本情况,如果您输入 0,它会给出 2 作为答案,因此为了绕过它,我使用了 if 语句,但收到错误输入“if”时解析错误。如果你们能提供帮助,我真的很感
暂停期间抛出异常 android.os.DeadObjectException 在 android.os.BinderProxy.transactNative( native 方法) 在 androi
我已经为猜词游戏编写了一些代码。它从用户输入中读取字符并在单词中搜索该字符;根据字符是否在单词中,程序返回并控制一些变量。 代码如下: import java.util.Random; import
我是自动化领域的新手。这是我的简单 TestNG 登录代码,当我以 TestNG 身份运行该代码时,它会出现 java.lang.NullPointerException,双击它会突出显示我导航到 U
我是c#程序员,我习惯了c#的封装语法和其他东西。但是现在,由于某些原因,我应该用java写一些东西,我现在正在练习java一天!我要创建一个为我自己创建一个虚拟项目,以便让自己更熟悉 Java 的
我正在使用 Intellij,我的源类是 main.com.coding,我的资源文件是 main.com.testing。我将 spring.xml 文件放入资源文件中。 我的测试类位于 test.
我想要我的tests folder separate到我的应用程序代码。我的项目结构是这样的 myproject/ myproject/ myproject.py moduleon
这个问题已经有答案了: What is a NullPointerException, and how do I fix it? (12 个回答) 已关闭 6 年前。 因此,我尝试比较 2 个值,一个
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