安卓日记——设计一个通用的BaseActivity

如果是只有一个Activity的App就没有必要写BaseActivity，但一旦大于一个我还是建议写一个BaseActivity，准没错。

每个Activity通常都是绑定视图，绑定控件，监听控件，获取Bundle，跳转Activity还有一些很有些烦人的小功能如：Toast，findViewById，我们都可以封装一层简化他们的使用

BaseActivity的代码如下：

public abstract class BaseActivity extends Activity implements View.OnClickListener {
    /** 是否沉浸状态栏 **/
    private boolean isSetStatusBar = true;
    /** 是否允许全屏 **/
    private boolean mAllowFullScreen = true;
    /** 是否禁止旋转屏幕 **/
    private boolean isAllowScreenRoate = false;
    /** 当前Activity渲染的视图View **/
    private View mContextView = null;
    /** 日志输出标志 **/
    protected final String TAG = this.getClass().getSimpleName();

    /** View点击 **/
    public abstract void widgetClick(View v);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "BaseActivity-->onCreate()");
        Bundle bundle = getIntent().getExtras();
        initParms(bundle);
        View mView = bindView();
        if (null == mView) {
            mContextView = LayoutInflater.from(this)
                    .inflate(bindLayout(), null);
        } else
            mContextView = mView;
        if (mAllowFullScreen) {
            requestWindowFeature(Window.FEATURE_NO_TITLE);
        }
        if (isSetStatusBar) {
            steepStatusBar();
        }
        setContentView(mContextView);
        if (!isAllowScreenRoate) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
        initView(mContextView);
        setListener();
        doBusiness(this);
    }

    /**
     * [沉浸状态栏]
     */
    private void steepStatusBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // 透明状态栏
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 透明导航栏
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }
    }

    /**
     * [初始化参数]
     *
     * @param parms
     */
    public abstract void initParms(Bundle parms);

    /**
     * [绑定视图]
     *
     * @return
     */
    public abstract View bindView();

    /**
     * [绑定布局]
     *
     * @return
     */
    public abstract int bindLayout();

    /**
     * [初始化控件]
     *
     * @param view
     */
    public abstract void initView(final View view);

    /**
     * [绑定控件]
     *
     * @param resId
     *
     * @return
     */
    protected    <T extends View> T $(int resId) {
        return (T) super.findViewById(resId);
    }

    /**
     * [设置监听]
     */
    public abstract void setListener();

    @Override
    public void onClick(View v) {
        widgetClick(v);
    }

    /**
     * [业务操作]
     *
     * @param mContext
     */
    public abstract void doBusiness(Context mContext);



    /**
     * [页面跳转]
     *
     * @param clz
     */
    public void startActivity(Class<?> clz) {
        startActivity(new Intent(BaseActivity.this,clz));
    }

    /**
     * [携带数据的页面跳转]
     *
     * @param clz
     * @param bundle
     */
    public void startActivity(Class<?> clz, Bundle bundle) {
        Intent intent = new Intent();
        intent.setClass(this, clz);
        if (bundle != null) {
            intent.putExtras(bundle);
        }
        startActivity(intent);
    }

    /**
     * [含有Bundle通过Class打开编辑界面]
     *
     * @param cls
     * @param bundle
     * @param requestCode
     */
    public void startActivityForResult(Class<?> cls, Bundle bundle,
                                       int requestCode) {
        Intent intent = new Intent();
        intent.setClass(this, cls);
        if (bundle != null) {
            intent.putExtras(bundle);
        }
        startActivityForResult(intent, requestCode);
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d(TAG, "onRestart()");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d(TAG, "onStart()");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG, "onResume()");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG, "onPause()");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG, "onStop()");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy()");
    }

    /**
     * [简化Toast]
     * @param msg
     */
    protected void showToast(String msg){
        Toast.makeText(this,msg,Toast.LENGTH_SHORT).show();
    }


    /**
     * [是否允许屏幕旋转]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

}
    /**
     * [是否允许全屏]
     *
     * @param allowFullScreen
     */
    public void setAllowFullScreen(boolean allowFullScreen) {
        this.mAllowFullScreen = allowFullScreen;
    }

    /**
     * [是否设置沉浸状态栏]
     *
     * @param isSetStatusBar
     */
    public void setSteepStatusBar(boolean isSetStatusBar) {
        this.isSetStatusBar = isSetStatusBar;
    }

    /**
     * [是否允许屏幕旋转]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

}[是否设置沉浸状态栏]
     *
     * @param isSetStatusBar
     */
    public void setSteepStatusBar(boolean isSetStatusBar) {
        this.isSetStatusBar = isSetStatusBar;
    }

    /**
     * [是否允许屏幕旋转]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

}

可以看到还是很多重复代码的，所以说搞一个BaseActivity是多么有必要

继承自BaseActivity的Activity使用如下：

public class MainActivity extends BaseActivity {
    private Button btn1;
    @Override
    public void widgetClick(View v) {
        switch (v.getId()){
            case R.id.button:
                //用简化了的toast和startActivity
                showToast("toast");
                startActivity(Main2Activity.class);
                break;
        }
    }

    @Override
    public void initParms(Bundle parms) {
        //解析bundle内容或者设置是否旋转，沉浸，全屏
    }

    @Override
    public View bindView() {
        return null;
    }

    @Override
    public int bindLayout() {
        return R.layout.activity_main;
    }

    @Override
    public void initView(View view) {
        btn1=$(R.id.button);
    }

    @Override
    public void setListener() {
        btn1.setOnClickListener(this);
    }

    @Override
    public void doBusiness(Context mContext) {

    }


}

其实不仅是Activity要搞一个基类，Fragment也要搞一个基类，这样可以大大减少重复代码，而且管理起来还比较容易，保持了样式的一致，如果想个性化也预留了相应的方法。