我正在尝试使用parcelable将from inputs(addactivity)添加到listview(mainactivity)中。单击add按钮后,main的listview中没有显示任何内容。
在验证了所有输入之后,我使用intent.putextra(add\u citat\u key,citat)发送对象;
**AddActivity:**
public static final String ADD_CITAT_KEY = "addCitatKey";
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean ok=true;
String inputTextAutor=mEditTextAutor.getText().toString();
if(inputTextAutor==null||inputTextAutor.trim().isEmpty() ||inputTextAutor.length()<3){
ok=false;
mEditTextAutor.setError("Autor invalid");
mEditTextAutor.requestFocus();
}
String inputTextTxt=mEditTextTxt.getText().toString();
if(inputTextTxt==null||inputTextTxt.trim().isEmpty() ||inputTextTxt.length()<3){
ok=false;
mEditTextTxt.setError("Autor invalid");
mEditTextTxt.requestFocus();
}
if(mEditTextNumarApriecieri.getText().toString().length()==0){
mEditTextNumarApriecieri.setText("0");
}
int inputTextNumar=Integer.parseInt(mEditTextNumarApriecieri.getText().toString());
if(inputTextNumar<=0){
ok=false;
mEditTextNumarApriecieri.setError("Introduceti o durata>=0");
mEditTextNumarApriecieri.requestFocus();
}
String spinnerInput=mSpinnerCategorii.getSelectedItem().toString();
if(ok ==true){
Citat citat=new Citat(inputTextAutor,inputTextTxt,inputTextNumar,spinnerInput);
intent=getIntent();
intent.putExtra(ADD_CITAT_KEY,citat);
setResult(RESULT_OK,intent);
finish();
Log.d("Trimitere","citat trimis: " +citat.toString());
}
}
});
使用onactivityresult从addactivity接收对象。但是什么都没有,我不知道问题出在哪里。
**MainActivity:**
public static final int REQUEST_CODE_ADD_CITAT = 200;
ListView mListView;
List<Citat> listaCitate=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView=findViewById(R.id.listview);
ArrayAdapter<Citat> adapter=new ArrayAdapter<>(getApplicationContext(),android.R.layout.simple_list_item_1,listaCitate);
mListView.setAdapter(adapter);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==REQUEST_CODE_ADD_CITAT&&resultCode==RESULT_OK&&data!=null)
{
Citat citat=data.getParcelableExtra(ADD_CITAT_KEY);
Log.d("Tag",citat.toString());
if(citat!=null)
{
listaCitate.add(citat);
Toast.makeText(getApplicationContext(),citat.toString(),Toast.LENGTH_SHORT).show();
ArrayAdapter<Citat> adapter=(ArrayAdapter<Citat>) mListView.getAdapter();
adapter.notifyDataSetChanged();
}
}
}
暂无答案!
目前还没有任何答案,快来回答吧!