AppManager管理Activity

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在开发app时候，要考虑很多因素。内存是一个大问题。有一个管理activity的工具类，能给每次开发减去大量麻烦。

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);} catch (Exception e) {}}}

应用场景解读：

1.BaseActivity

以后的activity都将继承BaseActivity。

super.onCreate(savedInstanceState);allowFullScreen = true;// 添加Activity到堆栈AppManager.getAppManager().addActivity(this);}@Overrideprotected void onDestroy() {super.onDestroy();// 结束Activity&从堆栈中移除AppManager.getAppManager().finishActivity(this);}

2.按返回键，退出当前Activity

<span style="white-space:pre"></span>@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {switch (keyCode) {case KeyEvent.KEYCODE_BACK:AppManager.getAppManager().finishActivity(CaptureActivity.this);return true;}return super.onKeyDown(keyCode, event);}

3.实现双击退出App

/** * 双击退出 * 创建日期 2014-05-12 * @author 火蚁 (http://my.oschina.net/LittleDY) *  */public class DoubleClickExitHelper {private final Activity mActivity;private boolean isOnKeyBacking;private Handler mHandler;private Toast mBackToast;public DoubleClickExitHelper(Activity activity) {mActivity = activity;mHandler = new Handler(Looper.getMainLooper());}/** * Activity onKeyDown事件 * */public boolean onKeyDown(int keyCode, KeyEvent event) {if(keyCode != KeyEvent.KEYCODE_BACK) {return false;}if(isOnKeyBacking) {mHandler.removeCallbacks(onBackTimeRunnable);if(mBackToast != null){mBackToast.cancel();}// 退出AppManager.getAppManager().AppExit(mActivity);return true;} else {isOnKeyBacking = true;if(mBackToast == null) {mBackToast = Toast.makeText(mActivity, R.string.back_exit_tips, 2000);}mBackToast.show();mHandler.postDelayed(onBackTimeRunnable, 2000);return true;}}private Runnable onBackTimeRunnable = new Runnable() {@Overridepublic void run() {isOnKeyBacking = false;if(mBackToast != null){mBackToast.cancel();}}};}

只需在Activity实例化DoubleClickExitHelper就ok.

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