返回gridview里选中的Button上面的文字到外面的TextView

Question

public class Gridview2Adapter  extends BaseAdapter { public Gridview2Adapter(Context context,List<String> list) { } @Override public int getCount() { // TODO Auto-generated method stub return 20;//按钮的个数 } @Override public Object getItem(int arg0) { // TODO Auto-generated method stub return arg0; } @Override public long getItemId(int arg0) { // TODO Auto-generated method stub return arg0; } @Override public View getView(int position, View convertview, ViewGroup arg2) { convertview=inflater.inflate(R.layout.gridview2_item, null); g2_btn=(Button) convertview.findViewById(R.id.g2_btn); //List<String> band=setChannel_band(); //给每一个button设置监听事件，即是让textview的内容显示为点击的按钮上的text作为频道 String str=(String)g2_btn.getText(); channel.setText(str); return convertview; } }public class MainActivity extends Activity {     GridView gridview2;     TextView channel;     List<String> channel_band=new ArrayList<String>();     //设置按钮默认的文字     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         gridview2=(GridView)findViewById(R.id.gridview2);         gridview2.setAdapter(new Gridview2Adapter(this,channel_band));         channel=(TextView) findViewById(R.id.channel);         for(int j=0;j<19;j++){         channel_band.add("频道"+j);         }         gridview2.setOnItemClickListener(new OnItemClickListener() {         @Override         public void onItemClick(AdapterView<?> parent, View view, int position,         long id) {         // TODO Auto-generated method stub             for(int i = 0;i<channel_band.size();i++){                 if(position == i){                     channel_band.get(i).setSelect(true);                 }else{                     channel_band.get(i).setSelect(false);                 }             }             mAdapter.choiceState(position);         Toast.makeText(MainActivity.this, position+"被点击", Toast.LENGTH_SHORT).show();         }         });     }越想越乱，不知道怎么写了