android - 当我选择单选按钮时，我的应用程序崩溃了

Question

我有 3 个单选按钮，每个单选按钮执行一些操作，使用这个单选按钮我正在过滤我的结果，例如，RB1 用于 DATE-WISE RB2 用于客户名称，RB3 用于产品名称。

上面两个单选按钮工作正常(RB2 和 RB3)，但是当我选择 RB3(DATE-WISE) 时我的应用程序崩溃了。

final RadioGroup rgroup = (RadioGroup)findViewById(R.id.radioType);
        final RadioButton Ta = (RadioButton)findViewById(R.id.type_a);
        final RadioButton Tb = (RadioButton)findViewById(R.id.type_b);
        final RadioButton Tc = (RadioButton)findViewById(R.id.type_c);
        rgroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()     {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if (rgroup.getCheckedRadioButtonId() == Ta.getId()) {
                    cus_names = listItems.get(cus_name.getSelectedItemPosition());
                    btn1.setVisibility(View.VISIBLE);
                    btn2.setVisibility(View.VISIBLE);
                    created_date1.setVisibility(View.VISIBLE);
                    created_date2.setVisibility(View.VISIBLE);
                    cus_name.setVisibility(View.GONE);
                    po_id.setVisibility(View.GONE);
                }
                else if (rgroup.getCheckedRadioButtonId() == Tb.getId()) {
                    cus_name.setSelection(0);
                    cus_name.setVisibility(View.VISIBLE);
                    btn1.setVisibility(View.GONE);
                    btn2.setVisibility(View.GONE);
                    created_date1.setVisibility(View.GONE);
                    created_date2.setVisibility(View.GONE);
                    po_id.setVisibility(View.GONE);
                }
                else if (rgroup.getCheckedRadioButtonId() == Tc.getId()) {
                    po_id.setSelection(0);
                    po_id.setVisibility(View.VISIBLE);
                    btn1.setVisibility(View.GONE);
                    btn2.setVisibility(View.GONE);
                    created_date1.setVisibility(View.GONE);
                    created_date2.setVisibility(View.GONE);
                    cus_name.setVisibility(View.GONE);
                }
            }
        });

我的日志:

07-28 11:47:53.243 13244-13244/com.example.Minal E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.Minal, PID: 13244
java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
    at java.util.ArrayList.get(ArrayList.java:310)
    at com.example.Minal.Purchase_Pending$1.onCheckedChanged(Purchase_Pending.java:180)
    at android.widget.RadioGroup.setCheckedId(RadioGroup.java:173)
    at android.widget.RadioGroup.-wrap0(RadioGroup.java)
    at android.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:351)
    at android.widget.CompoundButton.setChecked(CompoundButton.java:159)
    at android.widget.CompoundButton.toggle(CompoundButton.java:115)
    at android.widget.RadioButton.toggle(RadioButton.java:76)
    at android.widget.CompoundButton.performClick(CompoundButton.java:120)
    at android.view.View$PerformClick.run(View.java:21147)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

在您的情况下，原因是 cus_name.getSelectedItemPosition() 返回 -1(它不是您的 listItem 的索引)并且您的 listItem 大小为 0。
所以你应该在获取值之前检查它，以防止像 ArrayIndexOutOfBoundsException

if(cus_name.getSelectedItemPosition() > -1 && cus_name.getSelectedItemPosition() < listItems.size()){
      cus_names = listItems.get(cus_name.getSelectedItemPosition());
}

希望对你有帮助