使用 .setEnabled() 启用/禁用选项菜单按钮？
我试图做这样的事情：
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
//multiListener = false;
menu.add(0,START_DELETE,0, "Delete selected..").setEnabled(multiListener);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.multiselect:
if(multiselect == 0) { multiselect = 1;
multiListener = true;
Log.d("DH", "index="+multiListener);
}
else if(multiselect == 1) { multiselect = 0; multiListener = false;
Log.d("DH", "index="+multiListener);
}
fillData();
return true;
case START_DELETE:
Toast.makeText(Notepadv3.this, "Pressed delete", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
基本上，如果 multiListener = true;使“删除选定的..”可按下，否则将其灰显...
这个简单的事情..不想和我一起解决，
因为某种原因...按钮总是灰显的，尽管Log说，它改变了是真的...
有人知道吗？
Im trying to do something like this:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
//multiListener = false;
menu.add(0,START_DELETE,0, "Delete selected..").setEnabled(multiListener);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.multiselect:
if(multiselect == 0) { multiselect = 1;
multiListener = true;
Log.d("DH", "index="+multiListener);
}
else if(multiselect == 1) { multiselect = 0; multiListener = false;
Log.d("DH", "index="+multiListener);
}
fillData();
return true;
case START_DELETE:
Toast.makeText(Notepadv3.this, "Pressed delete", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
Basically, if multiListener = true; make "Delete selected.." pressable otherwise gray it out...
This simple , thing.. doesn't want to work out with me,
for somehow... the button is always greyed out, although Log says that, it changes to true...
Anyone, know something?
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评论（1）
您应该再次调用
setEnabled()来更改项目的状态。它的状态不绑定到变量。应在onPrepareOptionsMenu()中调用此方法。You should call
setEnabled()again to change item's state. Its state doesn't bind to a variable. This method should be called inonPrepareOptionsMenu().