动态添加代码

import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;/** * Class which shows how to change dynamically options menu items * @author FaYnaSoft Labs */public class Main extends Activity {    private Button clickBtn;    private boolean isChangedStat = false;    private static final int MENUITEM = Menu.FIRST;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        clickBtn = (Button) findViewById(R.id.click);        clickBtn.setText("Click me");        clickBtn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                if (isChangedStat) {                    isChangedStat = false;                } else {                    isChangedStat = true;                }            }        });    }    @Override    public boolean onPrepareOptionsMenu(Menu menu) {        menu.clear();        if (isChangedStat) {            menu.add(0, MENUITEM, 0, "True");        } else {            menu.add(0, MENUITEM, 0, "False");        }        return super.onPrepareOptionsMenu(menu);    }}

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