如何在android更新时选中复选框？
如何在android更新时选中复选框？
提问于 2013-10-09 22:25:06
我有一个带有两个单选按钮(自我交付和公司交付).In的应用程序表单，当用户选择任何一个单选按钮.I获得单选按钮的文本，并插入到数据库中使用此代码。
Form.java
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup arg0, int arg1) {
// TODO Auto-generated method stub
selectedId = radioGroup.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioButton = (RadioButton) findViewById(selectedId);
if(radioButton.isChecked()){
OPTIONS=radioButton.getText().toString();
if(OPTIONS.equals("SelfDelivery")){
deliveryAddress.setVisibility(View.GONE);
deliveryEdit.setVisibility(View.GONE);
}else{
deliveryAddress.setVisibility(View.VISIBLE);
deliveryEdit.setVisibility(View.VISIBLE);
}
}
}
});当用户想要编辑表单时，我正在使用代码创建新的屏幕来编辑和更新details.by。
EditForm.java
final String ram=extras.getString(openHelper_ob.DELIVERY_OPTIONS);// getting the option from Form.java to EditForm.java
OPTIONS=ram;
if(OPTIONS.equals("CompanyDelivery")){
radioButtonCompany.setChecked(true);
deliveryText.setVisibility(View.VISIBLE);
editAddress.setVisibility(View.VISIBLE);
}else if(OPTIONS.equals("SelfDelivery")){
radioButtonSelf.setChecked(true);
deliveryText.setVisibility(View.GONE);
editAddress.setVisibility(View.GONE);
}
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup arg0, int arg1) {
// TODO Auto-generated method stub
selectedId = radioGroup.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioButton = (RadioButton) findViewById(selectedId);
if(radioButton.isChecked()){
OPTIONS=radioButton.getText().toString();
if(OPTIONS.equals("SelfDelivery")){
deliveryText.setVisibility(View.GONE);
editAddress.setVisibility(View.GONE);
}else{
deliveryText.setVisibility(View.VISIBLE);
editAddress.setVisibility(View.VISIBLE);
}
}
}
});我想使单选按钮根据用户的选择，同时返回到编辑页面。例如:如果用户选择了公司交付，当用户在交付选项中编辑表单时，应该在编辑页面中选中公司交付。
我在以下位置遇到错误
RadioButtonCompany.setChecked(真)；
错误是
10-10 04:41:20.721: E/AndroidRuntime(794): FATAL EXCEPTION: main
10-10 04:41:20.721: E/AndroidRuntime(794): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android/com.example.android.EditBookingForm}: java.lang.NullPointerException
10-10 04:41:20.721: E/AndroidRuntime(794): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.os.Handler.dispatchMessage(Handler.java:99)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.os.Looper.loop(Looper.java:137)
10-10 04:41:20.721: E/AndroidRuntime(794): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-10 04:41:20.721: E/AndroidRuntime(794): at java.lang.reflect.Method.invokeNative(Native Method)
10-10 04:41:20.721: E/AndroidRuntime(794): at java.lang.reflect.Method.invoke(Method.java:511)
10-10 04:41:20.721: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-10 04:41:20.721: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-10 04:41:20.721: E/AndroidRuntime(794): at dalvik.system.NativeStart.main(Native Method)
10-10 04:41:20.721: E/AndroidRuntime(794): Caused by: java.lang.NullPointerException回答 1
Stack Overflow用户
发布于 2013-10-09 22:35:09
在没有Logcat打印输出的情况下，我所能做的唯一的假设就是您没有在radioButtonCompany的布局中找到适当的id，并且得到一个空指针错误。
或者，您试图在UI线程之外修改单选按钮的检查状态，因此需要在runOnUIThread( ){}子句中包含您的setChecked。但是额外的LogCat输出会有很大的帮助。
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原文链接：
https://stackoverflow.com/questions/19274780
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