Question

我的项目中有简单的radioGroup。当我设置监听器，然后按菜单显示包含该RadioGroup的对话框时，它将显示“不幸的是，已停止”。当我删除代码“... setOnCheckedChangeListener”时，它将显示该对话框，并且没有错误。我已经阅读了很多来源将侦听器设置为radioGroup，我不知道为什么我的应用程序仍然有问题。请帮我。这是我的代码：

private void drawRectangle()
   {
       currentDialog = new Dialog(this);
       currentDialog.setContentView(R.layout.draw_rectangle_dialog);
       currentDialog.setTitle(R.string.title_draw_rectangle_dialog);
       currentDialog.setCancelable(true);

   // get the color SeekBars and set their onChange listeners
   final SeekBar alphaSeekBar = 
      (SeekBar) currentDialog.findViewById(R.id.alphaSeekBar);
   final SeekBar redSeekBar = 
      (SeekBar) currentDialog.findViewById(R.id.redSeekBar);
   final SeekBar greenSeekBar = 
      (SeekBar) currentDialog.findViewById(R.id.greenSeekBar);
   final SeekBar blueSeekBar = 
      (SeekBar) currentDialog.findViewById(R.id.blueSeekBar);

   // register SeekBar event listeners
   alphaSeekBar.setOnSeekBarChangeListener(drawRectangleSeekBarChanged);
   redSeekBar.setOnSeekBarChangeListener(drawRectangleSeekBarChanged);
   greenSeekBar.setOnSeekBarChangeListener(drawRectangleSeekBarChanged);
   blueSeekBar.setOnSeekBarChangeListener(drawRectangleSeekBarChanged);

   // use current drawing color to set SeekBar values
   alphaSeekBar.setProgress(255);
   redSeekBar.setProgress(255);
   greenSeekBar.setProgress(255);
   blueSeekBar.setProgress(255);   

   final RadioGroup radioGroup = (RadioGroup) findViewById(R.id.fill_rectangle);
   radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
   {
        public void onCheckedChanged(RadioGroup rGroup, int checkedId)
        {};
   });

   // set the Set Color Button's onClickListener
   Button setColorButton = (Button) currentDialog.findViewById(
      R.id.drawRectangleButton);
   setColorButton.setOnClickListener(drawRectangleButtonListener);

   dialogIsVisible.set(true); // dialog is on the screen
   currentDialog.show(); // show the dialog

}

这是我的XML代码的一部分：

    <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"
      android:layout_margin="10dp">
      <TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content" 
          android:text="@string/label_fill" android:gravity="right"
          android:layout_gravity="center_vertical"/>
      <RadioGroup
          android:id="@+id/fill_rectangle"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:orientation="horizontal">
          <RadioButton
             android:id="@+id/fillYes"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/label_yes"/>
          <RadioButton
             android:id="@+id/fillNo"
             android:layout_width="wrap_content"
             android:la![enter image description here][1]yout_height="wrap_content"
             android:text="@string/label_no"/>
      </RadioGroup>
   </LinearLayout>

这是logcat：

06-29 22:47:37.572: E/AndroidRuntime(11472): FATAL EXCEPTION: main
06-29 22:47:37.572: E/AndroidRuntime(11472): Process: com.deitel.doodlz, PID: 11472
06-29 22:47:37.572: E/AndroidRuntime(11472): java.lang.NullPointerException
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.deitel.doodlz.Doodlz.drawRectangle(Doodlz.java:569)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.deitel.doodlz.Doodlz.onOptionsItemSelected(Doodlz.java:230)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.app.Activity.onMenuItemSelected(Activity.java:2650)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1084)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:177)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.widget.AdapterView.performItemClick(AdapterView.java:308)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.widget.AbsListView.performItemClick(AbsListView.java:1476)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:3497)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.widget.AbsListView$3.run(AbsListView.java:4814)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.os.Handler.handleCallback(Handler.java:733)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.os.Handler.dispatchMessage(Handler.java:95)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.os.Looper.loop(Looper.java:157)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at android.app.ActivityThread.main(ActivityThread.java:5293)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at java.lang.reflect.Method.invokeNative(Native Method)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at java.lang.reflect.Method.invoke(Method.java:515)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
06-29 22:47:37.572: E/AndroidRuntime(11472):    at dalvik.system.NativeStart.main(Native Method)

setOnCheckedChangeListener RadioGroup Android错误

0 个答案: