Java 这些静态getter&；setter方法-Android？
我被Android代码中的一个很小的问题弄糊涂了。我在自定义类（即“ResultsRoomInfoCustRLYT”）中创建的所有getter和setter都为我提供了以下“Java NullPointerException”：Java 这些静态getter&；setter方法-Android？,java,android,nullpointerexception,getter-setter,Java,Android,Nullpointerexception,Getter Setter,我被Android代码中的一个很小的问题弄糊涂了。我在自定义类（即“ResultsRoomInfoCustRLYT”）中创建的所有getter和setter都为我提供了以下“Java NullPointerException”： 05-31 13:37:13.222 29262-29262/com.whitsoft.stan E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.NullPointerException at com
05-31 13:37:13.222 29262-29262/com.whitsoft.stan E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.whitsoft.stan.mods.ResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(ResultsRoomInfoCustRLYT.java:61)
at com.whitsoft.stan.utils.DataFixer.updateRelevantViewsWithSelectedData(DataFixer.java:48)
at com.whitsoft.stan.mods.StanListFragment.checkIfTheListAdapterDataHasChanged(StanListFragment.java:98)
at com.whitsoft.stan.mods.StanListFragment.onActivityCreated(StanListFragment.java:49)
at android.app.Fragment.performActivityCreated(Fragment.java:1707)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:921)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
at android.app.BackStackRecord.run(BackStackRecord.java:682)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5493)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
at dalvik.system.NativeStart.main(Native Method)
public class ResultsRoomInfoCustRLYT extends RelativeLayout {
LayoutInflater stanInflater;
private static TextView singleRoomsNumberTV, singleRoomsDescTV, vipRoomsNumberTV, vipRoomsDescTV;
public ResultsRoomInfoCustRLYT(Context context) {
super(context);
stanInflater = LayoutInflater.from(context);
initializeAndLayoutChildren();
}
public ResultsRoomInfoCustRLYT(Context context, AttributeSet attrs) {
super(context, attrs);
stanInflater = LayoutInflater.from(context);
initializeAndLayoutChildren();
}
public ResultsRoomInfoCustRLYT(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
stanInflater = LayoutInflater.from(context);
initializeAndLayoutChildren();
}
private void initializeAndLayoutChildren() {
stanInflater.inflate(R.layout.cust_rlyt_results_room_info, this, true);
singleRoomsNumberTV = (TextView) findViewById(R.id.stan_Single_Rooms_Number_TV);
singleRoomsDescTV = (TextView) findViewById(R.id.stan_Single_Rooms_Description_TV);
vipRoomsNumberTV = (TextView) findViewById(R.id.stan_VIP_Rooms_Number_TV);
vipRoomsDescTV = (TextView) findViewById(R.id.stan_VIP_Rooms_Description_TV);
}
public static String getSingleRoomsNumberTextValue() {
return singleRoomsNumberTV.getText().toString();
}
public static void setSingleRoomsNumberTextValue(String singleRoomsNumberText) {
singleRoomsNumberTV.setText(singleRoomsNumberText);
}
public static void setVipRoomsNumberTextValue (String vipRoomsNumberText) {
vipRoomsNumberTV.setText(vipRoomsNumberText);
}
public static String getVipRoomsDescTextValue () {
return vipRoomsDescTV.getText().toString();
}
public static void setVipRoomsDescTextValue (String vipRoomsDescText) {
vipRoomsDescTV.setText(vipRoomsDescText);
} }
ResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(singleRoomsNumberInfo);
ResultsRoomInfoCustRLYT.setSingleRoomsDescTextValue(singleRoomsDescInfo);
ResultsRoomInfoCustRLYT.setVipRoomsNumberTextValue(vipRoomsNumberInfo);
ResultsRoomInfoCustRLYT.setVipRoomsDescTextValue(vipRoomsDescInfo);
Shore-T.您的静态getter和setter访问由非静态方法初始化的静态引用-
initializeAndLayoutChildren例如，静态方法
setSingleRoomsNumberTextValuesingleRoomsNumberTVResultsRoomInfoCustRLYTinitializeAndLayoutChildrenResultsRoomInfoCustRLYTNullPointerExceptioninitializeAndLayoutChildren例如，静态方法
setSingleRoomsNumberTextValuesingleRoomsNumberTVResultsRoomInfoCustRLYTinitializeAndLayoutChildrenResultsRoomInfoCustRLYTNullPointerExceptioninitializeAndLayoutChildren例如，静态方法
setSingleRoomsNumberTextValuesingleRoomsNumberTVResultsRoomInfoCustRLYTinitializeAndLayoutChildrenResultsRoomInfoCustRLYTNullPointerExceptioninitializeAndLayoutChildren例如，静态方法
setSingleRoomsNumberTextValuesingleRoomsNumberTVResultsRoomInfoCustRLYTinitializeAndLayoutChildrenResultsRoomInfoCustRLYTNullPointerExceptionnullResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(singleRoomsNumberInfo);
singleRoomsNumberTV.setText(singleRoomsNumberText);
new ResultsRoomInfoCustRLYT(this);
从您的活动初始化静态文本视图。问题是您试图将某些
文本视图的文本设置为空。例如，以下行：
ResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(singleRoomsNumberInfo);
尝试执行以下操作：
singleRoomsNumberTV.setText(singleRoomsNumberText);
但什么是单人房MBERTV？在哪里分配？您需要拨打：
new ResultsRoomInfoCustRLYT(this);
从您的活动初始化静态文本视图。问题是您试图将某些文本视图的文本设置为空。例如，以下行：
ResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(singleRoomsNumberInfo);
尝试执行以下操作：
singleRoomsNumberTV.setText(singleRoomsNumberText);
但什么是单人房MBERTV？在哪里分配？您需要拨打：
new ResultsRoomInfoCustRLYT(this);
从您的活动初始化静态文本视图。问题是您试图将某些文本视图的文本设置为空。例如，以下行：
ResultsRoomInfoCustRLYT.setSingleRoomsNumberTextValue(singleRoomsNumberInfo);
尝试执行以下操作：
singleRoomsNumberTV.setText(singleRoomsNumberText);
但什么是单人房MBERTV？在哪里分配？您需要拨打：
new ResultsRoomInfoCustRLYT(this);
从活动中初始化静态文本视图。在调用setter之前是否运行了initializeAndLayoutChildren（）函数？是否确定findViewById
调用返回了正确的视图引用，而不是null
（如果找不到传递的id，就会发生这种情况）。而且要快一点：静态getter和setter（例如变量）是非常糟糕的代码。哇，谢谢Tom-你把问题解决得很好。实际上，我有两个layout.xml文件用于这个自定义类（一个用于纵向视图，另一个用于