如果是只有一個(gè)Activity的App就沒(méi)有必要寫(xiě)B(tài)aseActivity咽白，但一旦大于一個(gè)我還是建議寫(xiě)一個(gè)BaseActivity萌焰，準(zhǔn)沒(méi)錯(cuò)揉燃。

每個(gè)Activity通常都是綁定視圖厢拭，綁定控件它匕，監(jiān)聽(tīng)控件，獲取Bundle寞射，跳轉(zhuǎn)Activity還有一些很有些煩人的小功能如：Toast渔工，findViewById，我們都可以封裝一層簡(jiǎn)化他們的使用

BaseActivity的代碼如下：

public abstract class BaseActivity extends Activity implements View.OnClickListener {
    /** 是否沉浸狀態(tài)欄 **/
    private boolean isSetStatusBar = true;
    /** 是否允許全屏 **/
    private boolean mAllowFullScreen = true;
    /** 是否禁止旋轉(zhuǎn)屏幕 **/
    private boolean isAllowScreenRoate = false;
    /** 當(dāng)前Activity渲染的視圖View **/
    private View mContextView = null;
    /** 日志輸出標(biāo)志 **/
    protected final String TAG = this.getClass().getSimpleName();

    /** View點(diǎn)擊 **/
    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);
    }

    /**
     * [沉浸狀態(tài)欄]
     */
    private void steepStatusBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // 透明狀態(tài)欄
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            // 透明導(dǎo)航欄
            getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }
    }

    /**
     * [初始化參數(shù)]
     *
     * @param parms
     */
    public abstract void initParms(Bundle parms);

    /**
     * [綁定視圖]
     *
     * @return
     */
    public abstract View bindView();

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

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

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

    /**
     * [設(shè)置監(jiān)聽(tīng)]
     */
    public abstract void setListener();

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

    /**
     * [業(yè)務(wù)操作]
     *
     * @param mContext
     */
    public abstract void doBusiness(Context mContext);



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

    /**
     * [攜帶數(shù)據(jù)的頁(yè)面跳轉(zhuǎn)]
     *
     * @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通過(guò)Class打開(kāi)編輯界面]
     *
     * @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()");
    }

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


    /**
     * [是否允許屏幕旋轉(zhuǎn)]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

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

    /**
     * [是否設(shè)置沉浸狀態(tài)欄]
     *
     * @param isSetStatusBar
     */
    public void setSteepStatusBar(boolean isSetStatusBar) {
        this.isSetStatusBar = isSetStatusBar;
    }

    /**
     * [是否允許屏幕旋轉(zhuǎn)]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

}[是否設(shè)置沉浸狀態(tài)欄]
     *
     * @param isSetStatusBar
     */
    public void setSteepStatusBar(boolean isSetStatusBar) {
        this.isSetStatusBar = isSetStatusBar;
    }

    /**
     * [是否允許屏幕旋轉(zhuǎn)]
     *
     * @param isAllowScreenRoate
     */
    public void setScreenRoate(boolean isAllowScreenRoate) {
        this.isAllowScreenRoate = isAllowScreenRoate;
    }

}

可以看到還是很多重復(fù)代碼的桥温，所以說(shuō)搞一個(gè)BaseActivity是多么有必要

繼承自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:
                //用簡(jiǎn)化了的toast和startActivity
                showToast("toast");
                startActivity(Main2Activity.class);
                break;
        }
    }

    @Override
    public void initParms(Bundle parms) {
        //解析bundle內(nèi)容或者設(shè)置是否旋轉(zhuǎn)引矩，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) {

    }


}

其實(shí)不僅是Activity要搞一個(gè)基類侵浸，F(xiàn)ragment也要搞一個(gè)基類旺韭，這樣可以大大減少重復(fù)代碼，而且管理起來(lái)還比較容易掏觉，保持了樣式的一致区端，如果想個(gè)性化也預(yù)留了相應(yīng)的方法。