ANDROID JAVA-BUTTTON事件+TextView EXSAMPLE

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class testActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    
    public void button1_Click(View view) {
    TextView output = (TextView) findViewById(R.id.txtOutput);
    output.setText("HI");
    }
}