标签:android radio-button radio-group
我有一个包含单选按钮的自定义对话框,但是当我添加一个oncheckedchangelistener时,我的应用程序崩溃了.可能是什么问题呢?
提前致谢! :d
这是我的代码:
GridViewAdapter adapter = new GridViewAdapter(alcoholType.this, images,names);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.alcoholdialog);
dialog.setTitle("ORDER " + names.get(position));
radioQuantity = (RadioGroup) findViewById(R.id.radioQuantity);
quantity1 = (RadioButton) findViewById(R.id.quantity1);
quantity2 = (RadioButton) findViewById(R.id.quantity2);
radioQuantity.clearCheck();
radioQuantity.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
}
});
dialog.show();
}
});
这是错误跟踪:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.gin.ordering, PID: 22005
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.RadioGroup.clearCheck()' on a null object reference
at com.example.gin.ordering.alcoholType$1.onItemClick(alcoholType.java:90)
at android.widget.AdapterView.performItemClick(AdapterView.java:339)
at android.widget.AbsListView.performItemClick(AbsListView.java:1549)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3723)
at android.widget.AbsListView$3.run(AbsListView.java:5707)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6918)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
解决方法:
您需要使用Dialog的引用来获取视图:
使用:
radioQuantity = (RadioGroup) dialog.findViewById(R.id.radioQuantity);
quantity1 = (RadioButton) dialog.findViewById(R.id.quantity1);
quantity2 = (RadioButton) dialog.findViewById(R.id.quantity2);
您得到NullPointerException,因为您的RadioGroup未附加到视图.
另外对于CheckedListener使用:
radioQuantity.setOnCheckedChangeListener(new
RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (checkedId == R.id.quantity1) {
//Your code
} else if (checkedId == R.id.quantity2) {
//Your code
}
}
});
标签:android,radio-button,radio-group 来源: https://codeday.me/bug/20190828/1752411.html
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