android APP在后台有时会被回收资源的问题

androidAPP长期在后台的话，会被系统回收资源，一些局部变量会被清除
Activity中需要以下操作保存有用的数据

1.

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            String username = savedInstanceState.getString("username");
            String password = savedInstanceState.getString("password");
            ClientSDKSingleton.getInstance().setUsername(username);
            ClientSDKSingleton.getInstance().setPassword(password);
            Log.i(TAG, "onCreate username=" + username + " password="
                    + password);
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        String username = ClientSDKSingleton.getInstance().getUsername();
        String password = ClientSDKSingleton.getInstance().getPassword();
        outState.putString("username", username);
        outState.putString("password", password);
    }

2

static {
        System.loadLibrary("faac");
        System.loadLibrary("faad");
        System.loadLibrary("ffmpeg");
        System.loadLibrary("OSbase");
        System.loadLibrary("weibosdkcore");
    }

以上两端代码可以写在BaseActivity中，让所有Activity都继承BaseActivity