随笔

1. 内部类尽量使用static，是java规范吧
    比如外部使用该内部类，可以避免实例化内部类所在的类。

 

2. 改变Menu文本样式（颜色大小等）

   颜色：

   

<item name="actionMenuTextColor">@color/white</item>

  全部：

  

<item name="actionMenuTextAppearance">@style/TextAppearance.AppCompat.Small</item>

 

3. LayoutInflater Factory用法（转自http://blog.csdn.net/sodino/article/details/6165132）

package lab.sodino.menutest;
import android.content.Context;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
/**
 * @author Sodino E-mail:sodinoopen@hotmail.com
 * @version Time：2011-1-26 下午04:42:04
 */
public class MenuAct extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        MenuInflater inflater = new MenuInflater(getApplicationContext());
        inflater.inflate(R.menu.menu, menu);
        setMenuBackground();
        return true;
    }
    public boolean onOptionsItemSelected(MenuItem item) {
        String info = "";
        switch (item.getItemId()) {
        case R.id.menu_add:
            info = "Add";
            break;
        case R.id.menu_delete:
            info = "Delete";
            break;
        case R.id.menu_home:
            info = "Home";
            break;
        case R.id.menu_help:
            info = "Help";
            break;
        default:
            info = "NULL";
            break;
        }
        Toast toast = Toast.makeText(this, info, Toast.LENGTH_SHORT);
        toast.show();
        return super.onOptionsItemSelected(item);
    }
    // 关键代码为重写Layout.Factory.onCreateView()方法自定义布局
    protected void setMenuBackground() {
        MenuAct.this.getLayoutInflater().setFactory(new android.view.LayoutInflater.Factory() {
            /**
             * name - Tag name to be inflated.<br/>
             * context - The context the view is being created in.<br/>
             * attrs - Inflation attributes as specified in XML file.<br/>
             */
            public View onCreateView(String name, Context context, AttributeSet attrs) {
                // 指定自定义inflate的对象
                if (name.equalsIgnoreCase("com.android.internal.view.menu.IconMenuItemView")) {
                    try {
                        LayoutInflater f = getLayoutInflater();
                        final View view = f.createView(name, null, attrs);
                        new Handler().post(new Runnable() {
                            public void run() {
                                // 设置背景图片
                                view.setBackgroundResource(R.drawable.menu_background);
                            }
                        });
                        return view;
                    } catch (InflateException e) {
                        e.printStackTrace();
                    } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                return null;
            }
        });
    }
}

 

4. 在Android Studio中使用lint检查代码！

   项目上右键Analyze->Inspect Code...，很有帮助，可能解决一些隐藏bug，比如字符串使用==而不是equals比较了。

   可以到Settings里面去设置具体检查哪些项目！