Android 菜单 使用XML

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main,menu);

        return true;
    }

    @Override
     onOptionsItemSelected(MenuItem item) {
         TODO Auto-generated method stub
        switch (item.getItemId()) {
        case R.id.create:
            Toast.makeText(MainActivity.this,"选择了创建文件",1).show();
            Intent intent = new Intent(MainActivity.class);
            item.setIntent(intent); /* 切换到第二个Activity */
            break;
         R.id.open:
            Toast.makeText(MainActivity.).show();
             R.id.load:
            Toast.makeText(MainActivity. R.id.save:
            Toast.makeText(MainActivity.default:
            ;
        }

        super.onOptionsItemSelected(item);
    }

android:showAsAction="ifRoom"