package com.example.uiwidgettest2; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.*; public class edittextActivity extends Activity implements View.OnClickListener{
      private ImageView iv;     private Button btn;     @Override     protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);         setContentView(R.layout.edittext);         btn = (Button)findViewById(R.id.button);         iv = (ImageView)findViewById(R.id.image_view);         btn.setOnClickListener(this);     }     @Override     public void onClick(View v) {
          switch (v.getId()){
              case R.id.button:                 iv.setImageResource(R.drawable.dst);                 break;             default:                 break;         }     } }