Android學習筆記之SoftReference軟引用,弱引用WeakReference

SoftReference可以用於bitmap緩存

WeakReference 可以用於handler

 private Handler mRemoteHandler = new SafeHandler(this);
    private static final int INIT_UI = 1;

    /**
     * safe handler
     */
    private static class SafeHandler extends Handler {
        private final WeakReference<MainActivity> mActivitys;

        public SafeHandler(MainActivity preview) {
            mActivitys = new WeakReference<MainActivity>(preview);
        }

        @Override
        public void handleMessage(Message msg) {
            MainActivity activity = mActivitys.get();
            if (activity != null) {
                if (null != msg) {
                    switch (msg.what) {
                        case INIT_UI:
                            activity.initView();
                            activity.updateUI();
                            break;
                        default:
                            break;
                    }
                }
            }
        }
    }