ImageButton的焦点和事件处理

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
/**
 * ImageButton的焦点和事件处理
 *
 */
public class ActivityMain extends Activity {
	private ImageButton myImageButton ;
	private Button myButton;
	private TextView myTextView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //创建三个组件
        myImageButton = (ImageButton)findViewById(R.id.myImageButton);
        myButton = (Button)findViewById(R.id.myButton);
        myTextView = (TextView)findViewById(R.id.myTextView1);

        //通过OnFocusChangeListener来响应ImageButton的onFocus事件
        myImageButton.setOnFocusChangeListener(new ImageButton.OnFocusChangeListener() {
        	public void onFocusChange(View v, boolean hasFocus) {
        		//如果ImageButton得到焦点onFocus则改变ImageButton的图片
        		if(hasFocus==true) {
        			//更改状态说明
        			myTextView.setText("图片按钮状态为:Got Focus");
        			//更改按钮背景图片
        			myImageButton.setImageResource(R.drawable.iconfull);
        		} else {
        			myTextView.setText("图片按钮状态为: Lost Focus");
        			myImageButton.setImageResource(R.drawable.iconempty);
        		}
        	}
        });

        //通过onClickListener来响应ImageButton的onClick事件
        myImageButton.setOnClickListener(new ImageButton.OnClickListener(){
        	public void onClick(View v) {
        		//如果ImageButton状态为onClick则改变ImageButton的图片和说明
        		myTextView.setText("图片按钮状态为: Got Click");
        		myImageButton.setImageResource(R.drawable.iconfull);
        	}
        });

        //通过onClickListener来响应Button的onClick事件
        myButton.setOnClickListener(new Button.OnClickListener(){
        	public void onClick(View v) {
        		//如果Button状态为onClick改变ImageButton图片
        		myTextView.setText("图片按钮状态为:Lost Focus");
        		myImageButton.setImageResource(R.drawable.iconempty);
        	}
        });
    }
}