Android之Activity框架

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
     */
    @Override
    public void onCreate(Bundle paramBundle) {
        super.onCreate(paramBundle);
        // 设置没有标题
        // requestWindowFeature(Window.FEATURE_NO_TITLE);
        mContext = this;
        app = (AmbowApplication) getApplication();
        AppManager.getAppManager().addActivity(this);
        initView();
    }

    /**
     * Android生命周期回调方法-销毁
     */
    @Override
    protected void onDestroy() {
        AppManager.getAppManager().finishActivity(this);
        super.onDestroy();

    }

    @Override
    protected void onResume() {

        super.onResume();
        overridePendingTransition(android.R.anim.fade_in,
                android.R.anim.fade_out);
    }

    @Override
    protected 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

    @Override
    protected 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);

    }

    @Override
    protected 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);
    }

    @Override
    protected void processLogic() {
        newsLv.addHeaderView(galleryView);
        eduNewsList = new ArrayList<NewsListEntity.News>();
        newsLv.addFooterView(addMoreView);
//      getTopNewsData();

    }

    @Override
    protected void setListener() {
        addMoreBtn.setOnClickListener(this);
        newsLv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public 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);
                }

            }
        });