Design a generic BaseActivity

If it is an App with only one Activity, there is no need to write BaseActivity, but once it is larger than one, I still recommend writing a BaseActivity, that's right.

Each Activity usually binds views, binds controls, monitors controls, obtains Bundles, jumps to Activity and some very annoying little functions such as: Toast, findViewById, we can encapsulate a layer to simplify their use

The code of BaseActivity is as follows:

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;
    }

}

It can be seen that there is still a lot of repeated code, so it is necessary to have a BaseActivity

Activity inherited from BaseActivity is used as follows:

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) {

    }


}

In fact, not only a base class for Activity, but also a base class for Fragment, which can greatly reduce the repetitive code, and it is easier to manage, keeping the style consistent, if you want to personalize, also reserve the corresponding method.