在安卓应用中，经常需要Activity中经常需要有大量相似的Activity类，这些类往往有相似的结构与功能，因此产生了大量重复代码，为此，以下提供一种方法有效的降低了代码冗余。
定义Activity工具类
* 应用程序Activity管理类：用于Activity管理和应用程序退出* 修订历史 ：* * ============================================================**/public class AppManager {private static Stack<Activity> activityStack;private static AppManager instance;private AppManager(){}/*** 单一实例*/public static AppManager getAppManager(){if(instance==null){instance=new AppManager();}return instance;}/*** 添加Activity到堆栈*/public void addActivity(Activity activity){if(activityStack==null){activityStack=new Stack<Activity>();}activityStack.add(activity);}/*** 获取当前Activity（堆栈中最后一个压入的）*/public Activity currentActivity(){Activity activity=activityStack.lastElement();return activity;}/*** 结束当前Activity（堆栈中最后一个压入的）*/public void finishActivity(){Activity activity=activityStack.lastElement();finishActivity(activity);}/*** 结束指定的Activity*/public void finishActivity(Activity activity){if(activity!=null){activityStack.remove(activity);activity.finish();activity=null;}}/*** 结束指定类名的Activity*/public void finishActivity(Class<?> cls){for (Activity activity : activityStack) {if(activity.getClass().equals(cls) ){finishActivity(activity);}}}/*** 结束所有Activity*/public void finishAllActivity(){for (int i = 0, size = activityStack.size(); i < size; i++){if (null != activityStack.get(i)){activityStack.get(i).finish();}}activityStack.clear();}/*** 退出应用程序*/public void AppExit(Context context) {try {finishAllActivity();ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);activityMgr.restartPackage(context.getPackageName());System.exit(0);android.os.Process.killProcess(android.os.Process.myPid());} catch (Exception e) { }}
}
定义Activity基类
public abstract class BaseActivity extends Activity implements OnClickListener {/*** Android生命周期回调方法-创建*/@Overridepublic void onCreate(Bundle paramBundle) {super.onCreate(paramBundle);mContext = this;app = (AmbowApplication) getApplication();AppManager.getAppManager().addActivity(this);initView();}/*** Android生命周期回调方法-销毁*/@Overrideprotected void onDestroy() {AppManager.getAppManager().finishActivity(this);super.onDestroy();}@Overrideprotected void onResume() {super.onResume();overridePendingTransition(android.R.anim.fade_in,android.R.anim.fade_out);}@Overrideprotected void onPause() {super.onPause();}/*** 初始化界面*/private void initView() {loadViewLayout();findViewById();processLogic();setListener();}/*** find控件*/protected abstract void findViewById();/*** 加载布局*/protected abstract void loadViewLayout();/*** 后台获取数据*/protected abstract void processLogic();/*** 设置监听*/protected abstract void setListener();
将获取布局，获取View,获取后台数据，设置监听设置为抽象方法，使得子类继承时必须要实现。
子类对抽象方法的实现
@Overrideprotected void findViewById() {newsLv = (ListView) this.findViewById(R.id.news_lv);gallery = (MyGallery) galleryView.findViewById(R.id.gallery);galleryRl = (RelativeLayout) galleryView.findViewById(R.id.rl_gallery);bannerTv = (TextView) galleryView.findViewById(R.id.banner_tv);addMoreBtn = (TextView) addMoreView.findViewById(R.id.btn_add_more);}@Overrideprotected void loadViewLayout() {setContentView(R.layout.news_list_layout);galleryView = View.inflate(mContext, R.layout.gallery_layout, null);addMoreView = View.inflate(mContext, R.layout.add_more, null);setTitleBarView(false, "资讯", -1, true);}@Overrideprotected void processLogic() {newsLv.addHeaderView(galleryView);eduNewsList = new ArrayList<NewsListEntity.News>();newsLv.addFooterView(addMoreView);
}@Overrideprotected void setListener() {addMoreBtn.setOnClickListener(this);newsLv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {Intent detailIntent = new Intent(mContext,NewsDetailActivity.class);if (eduNewsList.size() > arg2 - 1) {detailIntent.putExtra("id", eduNewsList.get(arg2 - 1).Id);startActivity(detailIntent);}}});
)
：使用场景Ⅰ：建立类型映射)
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