开源项目AndroidAnnotations

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Android Annotations是一个开源的框架，用于加速 Android应用的开发，可以让你把重点放在功能的实现上，简化了代码，提升了可维护性。

项目地址：https://github.com/excilys/androidannotations

    package com.googlecode.androidannotations.helloworldeclipse;            import java.util.Date;      import java.util.concurrent.TimeUnit;            import android.app.Activity;      import android.app.Notification;      import android.app.NotificationManager;      import android.app.PendingIntent;      import android.content.Intent;      import android.database.sqlite.SQLiteDatabase;      import android.os.Bundle;      import android.util.Log;      import android.view.MotionEvent;      import android.view.View;      import android.view.Window;      import android.view.WindowManager;      import android.widget.EditText;      import android.widget.TextView;      import android.widget.Toast;            import com.googlecode.androidannotations.annotations.Background;      import com.googlecode.androidannotations.annotations.Click;      import com.googlecode.androidannotations.annotations.EActivity;      import com.googlecode.androidannotations.annotations.LongClick;      import com.googlecode.androidannotations.annotations.SystemService;      import com.googlecode.androidannotations.annotations.Touch;      import com.googlecode.androidannotations.annotations.Transactional;      import com.googlecode.androidannotations.annotations.UiThread;      import com.googlecode.androidannotations.annotations.ViewById;      import com.googlecode.androidannotations.annotations.res.BooleanRes;      import com.googlecode.androidannotations.annotations.res.ColorRes;      import com.googlecode.androidannotations.annotations.res.StringRes;            @EActivity(R.layout.my_activity) //布局文件在这里声明，不用在setContentView      public class MyActivity extends Activity {                @ViewById  //控件这样标注，由于是IOC模式，因此不需要自己实例化          EditText myEditText;                @ViewById(R.id.myTextView) //提供id来生成控件，如果不指定ID，默认以控件名进行查找，如上面的myEditText          TextView textView;                @StringRes(R.string.hello)  //资源          String helloFormat;                @ColorRes          int androidColor;                @BooleanRes          boolean someBoolean;                @SystemService          NotificationManager notificationManager;                @SystemService          WindowManager windowManager;                /**          * AndroidAnnotations gracefully handles support for onBackPressed, whether          * you use ECLAIR (2.0), or pre ECLAIR android version.          */          public void onBackPressed() {              Toast.makeText(this, "Back key pressed!", Toast.LENGTH_SHORT).show();          }                    @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              // windowManager should not be null              windowManager.getDefaultDisplay();              requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);          }                      @Click //事件控制，可以以按钮的id作为方法名,同时支持的事件还有onLongClick，onTextChange等          void myButtonClicked() {              String name = myEditText.getText().toString();              setProgressBarIndeterminateVisibility(true);              someBackgroundWork(name, 5);          }                @Background //开启新线程后台运行，注意不要引用UI控件,而且返回值类型一定是void          void someBackgroundWork(String name, long timeToDoSomeLongComputation) {              try {                  TimeUnit.SECONDS.sleep(timeToDoSomeLongComputation);              } catch (InterruptedException e) {              }                    String message = String.format(helloFormat, name);                    updateUi(message, androidColor);                    showNotificationsDelayed();          }                @UiThread //UI线程          void updateUi(String message, int color) {              setProgressBarIndeterminateVisibility(false);              textView.setText(message);              textView.setTextColor(color);          }                @UiThread(delay=2000)  //可以设置延时时间，以毫秒为单位          void showNotificationsDelayed() {              Notification notification = new Notification(R.drawable.icon, "Hello !", 0);              PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(), 0);              notification.setLatestEventInfo(getApplicationContext(), "My notification", "Hello World!", contentIntent);              notificationManager.notify(1, notification);          }                @LongClick          void startExtraActivity() {              Intent intent = new Intent(this, ActivityWithExtra_.class);                    intent.putExtra(ActivityWithExtra.MY_DATE_EXTRA, new Date());              intent.putExtra(ActivityWithExtra.MY_STRING_EXTRA, "hello !");              intent.putExtra(ActivityWithExtra.MY_INT_EXTRA, 42);                    startActivity(intent);          }                @Click          void startListActivity(View v) {              startActivity(new Intent(this, MyListActivity_.class));          }                @Touch          void myTextView(MotionEvent event) {              Log.d("MyActivity", "myTextView was touched!");          }                @Transactional          int transactionalMethod(SQLiteDatabase db, int someParam) {              return 42;          }            }

这个项目的好处是使用到了IOC模式，代码量小而且简洁，使程序员更多的关注于业务逻辑而不是页面，而且@Backgroud这个标签下开启的线程在线程池中管理。
类似的项目还有Android Binding，RoboGuice等，有兴趣可以看一下这个文章
CLEAN CODE IN ANDROID APPLICATIONS一个Spring gay写得，很不错哦~
http://blog.springsource.com/2011/08/26/clean-code-with-android/