封装篇——基类Activity

说说为什么要做基类Activity：
1. 统一风格，易调整（吐司、系统栏颜色、进入退出动画…）
2. 细化基础生命周期方法，减少代码量。
总而言之，封装就是为了更优雅的写代码。。。

本文将从以下思路展开：

先要理清楚下Android中 Activity 的一些知识点：

• android Activity 生命周期详解 (在 运行Activity、按下返回按键、按Home键、
  按下电源键、跳转新Activity、再次打开、屏幕旋转 等场景下Activity的生命周期走向)；
• Activity的进入退出时动画的设置；
• 状态栏的设置（这边使用第三方 StatusBarUtil）；
• 屏幕旋转时如何保持数据状态与布局；
• android:configChanges 属性详解（官网API ,需）
  

了解完知识点后我们就可以进行简单的封装了

我们先创建一个 BaseAppCompatActivity 类对生命周期进行抽离打包，该类与业务完全无关

看图中思路就行，代码很简单。

/**
 * Created by wenld- on 2016/4/6.
 */
public abstract class BaseAppCompatActivity extends AppCompatActivity {
    protected static String TAG_LOG = null;
    protected Context mContext = null;
    public static final int LEFT = 1, RIGHT = 2, TOP = 3, BOTTOM = 4, SCALE = 5, FADE = 6;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        switch (getOverridePendingTransitionMode()) {
            case LEFT:
                overridePendingTransition(R.anim.left_in, R.anim.left_out);
                break;
            case RIGHT:
                overridePendingTransition(R.anim.right_in, R.anim.right_out);
                break;
            case TOP:
                overridePendingTransition(R.anim.top_in, R.anim.top_out);
                break;
            case BOTTOM:
                overridePendingTransition(R.anim.bottom_in, R.anim.bottom_out);
                break;
            case SCALE:
                overridePendingTransition(R.anim.scale_in, R.anim.scale_out);
                break;
            case FADE:
                overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
                break;
            default:
                overridePendingTransition(R.anim.left_in, R.anim.left_out);
                break;
        }
        super.onCreate(savedInstanceState);
        Bundle extras = getIntent().getExtras();
        if (null != extras) {
            getBundleExtras(extras);
        }

        mContext = this;
        TAG_LOG = this.getClass().getSimpleName();
        BaseAppManager.getInstance().addActivity(this);
        if (getContentViewLayoutID() != 0) {
            setContentView(getContentViewLayoutID());
        } else {
            throw new IllegalArgumentException("You must return a right contentView layout resource Id");
        }
        initViewsAndEvents();
    }


    @Override
    public void finish() {
        super.finish();
        BaseAppManager.getInstance().removeActivity(this);
        switch (getOverridePendingTransitionMode()) {
            case LEFT:
                overridePendingTransition(R.anim.left_in, R.anim.left_out);
                break;
            case RIGHT:
                overridePendingTransition(R.anim.right_in, R.anim.right_out);
                break;
            case TOP:
                overridePendingTransition(R.anim.top_in, R.anim.top_out);
                break;
            case BOTTOM:
                overridePendingTransition(R.anim.bottom_in, R.anim.bottom_out);
                break;
            case SCALE:
                overridePendingTransition(R.anim.scale_in, R.anim.scale_out);
                break;
            case FADE:
                overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
                break;
            default:
                overridePendingTransition(R.anim.left_in, R.anim.left_out);
                break;
        }
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        // 当新设置中，屏幕布局模式为横排时
        if (newConfig.orientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            //TODO 某些操作
        }
        super.onConfigurationChanged(newConfig);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        DetoryViewAndThing();
    }

    protected abstract int getContentViewLayoutID();
    protected abstract void getBundleExtras(Bundle extras);
    protected abstract void initViewsAndEvents();
    protected abstract int getOverridePendingTransitionMode();
    protected abstract void DetoryViewAndThing();

接下来我们创建一个class BaseActivity extends BaseAppCompatActivity ,对风格，方法，以及基础页面的封装，可参考：http://blog.csdn.net/sinat_15877283/article/details/51037987 内高级方法。

/**
 * Created by wenld- on 2016/3/7.
 */
public abstract class BaseActivity extends BaseAppCompatActivity implements IBaseView {
    /**
     * loading view controller
     */
    private VaryViewHelperController mVaryViewHelperController = null;

    @Override
    protected int getOverridePendingTransitionMode() {
        return LEFT;
    }

    @Override
    public void setContentView(int layoutResID) {
        super.setContentView(layoutResID);
        if (null != getLoadingTargetView()) {
            mVaryViewHelperController = new VaryViewHelperController(getLoadingTargetView());
        }
        setStatusBar();
    }

    protected void setStatusBar() {
        StatusBarUtil.setColor(this, getResources().getColor(R.color.colorPrimary));
    }
    /**
     * get loading target view
     */
    protected abstract View getLoadingTargetView();

    protected void readyGo(Class clazz) {
        Intent intent = new Intent(this, clazz);
        startActivity(intent);
    }

       protected void readyGo(Class clazz, Bundle bundle) {
        Intent intent = new Intent(this, clazz);
        if (null != bundle) {
            intent.putExtras(bundle);
        }
        startActivity(intent);
    }

    protected void readyGoThenKill(Class clazz) {
        Intent intent = new Intent(this, clazz);
        startActivity(intent);
        finish();
    }

    protected void readyGoThenKill(Class clazz, Bundle bundle) {
        Intent intent = new Intent(this, clazz);
        if (null != bundle) {
            intent.putExtras(bundle);
        }
        startActivity(intent);
        finish();
    }

    protected void readyGoForResult(Class clazz, int requestCode) {
        Intent intent = new Intent(this, clazz);
        startActivityForResult(intent, requestCode);
    }

    protected void readyGoForResult(Class clazz, int requestCode, Bundle bundle) {
        Intent intent = new Intent(this, clazz);
        if (null != bundle) {
            intent.putExtras(bundle);
        }
        startActivityForResult(intent, requestCode);
    }

    protected void showToast(String msg) {
        //防止遮盖虚拟按键
        if (null != msg && !StringUtils.isEmpty(msg)) {
            Snackbar.make(getLoadingTargetView(), msg, Snackbar.LENGTH_SHORT).show();
        }
    }

    /**
     * toggle show loading
     */
    protected void toggleShowLoading(boolean toggle, String msg) {
        if (null == mVaryViewHelperController) {
            throw new IllegalArgumentException("You must return a right target view for loading");
        }

        if (toggle) {
            mVaryViewHelperController.showLoading(msg);
        } else {
            mVaryViewHelperController.restore();
        }
    }

    /**
     * toggle show empty
     */
    protected void toggleShowEmpty(boolean toggle, String msg, View.OnClickListener onClickListener) {
        if (null == mVaryViewHelperController) {
            throw new IllegalArgumentException("You must return a right target view for loading");
        }

        if (toggle) {
            mVaryViewHelperController.showEmpty(msg, onClickListener);
        } else {
            mVaryViewHelperController.restore();
        }
    }

    /**
     * toggle show error
     */
    protected void toggleShowError(boolean toggle, String msg, View.OnClickListener onClickListener) {
        if (null == mVaryViewHelperController) {
            throw new IllegalArgumentException("You must return a right target view for loading");
        }

        if (toggle) {
            mVaryViewHelperController.showError(msg, onClickListener);
        } else {
            mVaryViewHelperController.restore();
        }
    }

    /**
     * toggle show network error
     */
    protected void toggleNetworkError(boolean toggle, View.OnClickListener onClickListener) {
        if (null == mVaryViewHelperController) {
            throw new IllegalArgumentException("You must return a right target view for loading");
        }

        if (toggle) {
            mVaryViewHelperController.showNetworkError(onClickListener);
        } else {
            mVaryViewHelperController.restore();
        }
    }
}

实际调用请大家自行实验，，请大家不要过分看重代码实现，思路最重要…