java - 防止发生错误时强行关闭

Question

我有以下代码。当编辑文本抛出“找不到字符串”错误时，它会强制关闭。我可以做什么来预防它？例如使用 Toast 通知？

    public void OnClImgBtSearch(View v)
{
    ImageButton ImgBtSearch=(ImageButton) findViewById(R.id.ImgBtSearch);
    EditText EditTextGhavaninShow=(EditText) findViewById(R.id.EditTextGhavaninShow);
    EditText EditTextGhavaninSearch=(EditText) findViewById(R.id.EditTextGhavaninSearch);

    String StrEditText =EditTextGhavaninSearch.getText().toString();


    //(EditTextGhavaninShow.getText().toString().contains(StrEditText))

    String s = EditTextGhavaninShow.getText().toString();
    try{
    if(EditTextGhavaninShow.getText().toString().contains(StrEditText));
    {
    int position = s.indexOf(StrEditText);              // where C is your character to be searched
    int Lastlen=s.lastIndexOf(StrEditText);
    int FirstLen=s.indexOf(StrEditText);
    EditTextGhavaninShow.setSelection(FirstLen,Lastlen);
    }}
    catch (TypeNotPresentException e) {
        Toast.makeText(getApplicationContext(), "عبارت مورد نظر یافت نشد", Toast.LENGTH_SHORT).show();

        e.printStackTrace();
    }

Answer 1

如果您想防止应用程序因任何类型的错误而崩溃，您应该使用Exception类:

try{
    if(EditTextGhavaninShow.getText().toString().contains(StrEditText)){
        int position = s.indexOf(StrEditText); // where C is your character to be searched
        int Lastlen=s.lastIndexOf(StrEditText);
        int FirstLen=s.indexOf(StrEditText);
        EditTextGhavaninShow.setSelection(FirstLen,Lastlen);
    }
}catch (Exception e) {
    Toast.makeText(getApplicationContext(), "عبارت مورد نظر یافت نشد", Toast.LENGTH_SHORT).show();
    e.printStackTrace();
}

尽管这不是一个好的解决方案，但您应该以不会在每种情况下崩溃的方式管理您的应用。