点击button显示文字

Button ib_01;
Textview tv_01;
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
ib_01 = (Button)this.findViewById(R.id.这里写你按钮的ID);
tv_01 = (Textview)this.findViewById(R.id.这里写你textview的ID);
ib_01.setOnClickListener(new OnClickListener(){

   public void onClick(View v) {
    tv_01.settext("这里写你想显示在textview上的字符串");
   }
})