Question

就这么简单，当我按下后退按钮时没有任何反应。这是运行的代码：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.tm_activity_inicio_resumen, container, false);

    ((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    ((AppCompatActivity)getActivity()).getSupportActionBar().setHomeAsUpIndicator(R.drawable.back_left2);

    return view;
}

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(getActivity().getApplicationContext(),"Back button clicked", Toast.LENGTH_SHORT).show();
            break;
    }
    return true;
}

这个实现有问题吗？

Answer 1

更改为此代码。

@Override
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) {
    case android.R.id.home: 
        onBackPressed();
        return true;
    }

return super.onOptionsItemSelected(item);
}

Answer 2

如果你想要片段上的动作栏菜单那么

覆盖片段上的onCreateOptionsMenu。并清除活动菜单

    @Override
            public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
                super.onCreateOptionsMenu(menu, inflater);
        menu.clear();

//if you dont have options skip inflate 
                    inflater.inflate(R.menu.menu_second, menu);
            }

和

 @Override
    public boolean onOptionsItemSelected(MenuItem item) {

          int id = item.getItemId();
            if (id == android.R.id.home) {
            Toast.makeText(getActivity().getApplicationContext(),"Back button clicked", Toast.LENGTH_SHORT).show();
        return true;
    }


return super.onOptionsItemSelected(item);
}

在actionBar上按下“返回”按钮时未调用onOptionsItemSelected

2 个答案: