public class MainActivity extends 1 {private 2 btn;private EditText et;private TextView3 ;private ImageView img;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn=(Button)this.findViewById( 4 .id.btn);5 =(EditText)this.findViewById(R.id.et);tv=(TextView)this.findViewById(R.id.tv);img=(ImageView)this.findViewById(R.id.img);//获得输入框中的数据String s= et .getText().toString();//按钮绑定单机事件btn.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {}});}}