Spinner默认选择问题

1.需求中使用Spinner,不允许有默认选中,在网上查了好多,有设置

 

spinner.setSelection(-1,true);

 

  也有设置如下:

 

  spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                /**
                 * 设置item的字体颜色
                 */
                if(isFrist){
                    isFrist=false;
                }else{
                    TextView textView= (TextView) view;
                    textView.setTextColor(getResources().getColor(R.color.hei));
                    Toast.makeText(MainActivity.this,""+parent.getItemIdAtPosition(position),Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });

 

  

 

但是spinner初始时会默认走setOnItemSelectedListener方法,并使得position==0;如上设置,虽然不会显示默认了,但是第一次点击却不能选中第0项,

只能在选取其他项后,才能再选择0项。

再看,下面的设置:给予设置默认为1,这是,spinner初始时不会走setOnItemSelectedListener方法了,但是他第一次点击不能选择第1项了。

 spinner.setSelection(1,true);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                /**
                 * 设置item的字体颜色
                 */
                    TextView textView= (TextView) view;
                    textView.setTextColor(getResources().getColor(R.color.hei));
                    Toast.makeText(MainActivity.this,""+parent.getItemIdAtPosition(position),Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

2.后采用的TextView加ListPopupWindow实现这个需求:

 

TextView textView2;
 private ListPopupWindow popupWindow;
 private List<String> strings;

  

 

  textView2= (TextView) findViewById(R.id.textView2);
        strings = new ArrayList<String>();
        strings.add("item1");
        strings.add("item2");
        strings.add("item3");

        popupWindow = new ListPopupWindow(this);
        popupWindow.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,strings));
        popupWindow.setAnchorView(textView2);
        popupWindow.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
        popupWindow.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);
        popupWindow.setModal(true);
        popupWindow.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                
                textView2.setText(strings.get(position));
                popupWindow.dismiss();
                Toast.makeText(MainActivity.this,""+textView2.getText().toString(),Toast.LENGTH_SHORT).show();

            }
        });
        textView2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                popupWindow.show();

            }
        });

  

 

3.实现效果:

  左侧是TextView和ListPopupWindow实现效果,右侧是Spinner效果

    

下拉效果对比:

 

posted @ 2017-02-23 10:56  咖喱不见不散啊  阅读(7783)  评论(0编辑  收藏  举报