//基類BaseActivity

public abstract class BaseActivity extends AppCompatActivity implements View.OnClickListener{
    private boolean isstatus=false;//沉浸式透明狀態列標識
private boolean showActionBar=true;//是否顯示標題欄ActionBar
private boolean isFullScreen=false;//隱藏狀態列
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
        super
 
.onCreate(savedInstanceState);
        setContentView(bindLayout());
        initViews();
        initData();;
        setOnclick();
    }

    //初始化佈局檔案
public abstract int bindLayout();
    //初始化控制元件
public abstract void initViews();
    //初始化資料
public abstract void initData();
    //初始化點選事件
public abstract void 
 
setOnclick();
    //初始化跳轉
public void startActivity(Class<?> clz){
        Intent intent=new Intent(this,clz);
        startActivity(intent);
    }
    //跳轉傳值
public void startActivity(Bundle bundle, Class<Main2Activity> clz){
        Intent intent=new Intent(this,clz);
        intent.putExtras(bundle);
        startActivity(intent);
    }
    ////透明狀態列方法
 
public void setStatus(boolean isstatus) {
        this.isstatus = isstatus;
        if (isstatus) {
            //判斷當前裝置的版本號大於等於19,走這個程式碼,用於程式碼適配
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                //透明狀態列
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            }
        }
    }
    //隱藏顯示標題欄
public void setAction(boolean showActionBar) {
        this.showActionBar=showActionBar;
        //顯示
if(showActionBar){
              getSupportActionBar().show();
        }else{
            //隱藏
getSupportActionBar().hide();
        }
    }
    //設定是否隱藏狀態列,顯示全屏
public void setFullScreen(boolean fullScreen){
        this.isFullScreen=isstatus;
        if(isFullScreen){
            //是全屏的時候
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        }
    }


    //Toast
public void showToats(String msg){
        Toast.makeText(this,msg,Toast.LENGTH_SHORT).show();
    }
}

public class MainActivity extends BaseActivity {
     Button btn1,btn2,btn3;
    //初始化佈局
@Override
public int bindLayout() {
        return R.layout.activity_main;
    }
   //初始化控制元件
@Override
public void initViews() {
           btn1=findViewById(R.id.btn1);
           btn2=findViewById(R.id.btn2);
           btn3=findViewById(R.id.btn3);
    }

    @Override
public void initData() {
         //設定狀態列沉浸式
setStatus(true);
         //是否顯示actionbar 標題欄
setAction(false);
         //是否全屏 隱藏狀態列
setFullScreen(true);
         //顯示進度,每次發起網路請求時候都有一個載入進度提示
DialogUtils.getmInstance(this).showprogressDialog("正在載入......");

    }

    @Override
public void setOnclick() {
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
    }


    @Override
public void onClick(View v) {
             switch (v.getId()){
                 case R.id.btn1:
                      startActivity(Main2Activity.class);
                      break;
                 case R.id.btn2:
                     Bundle bundle=new Bundle();
                     bundle.putString("yu","傻");
                      startActivity(bundle,Main2Activity.class);
                      break;
                 case R.id.btn3:
                     showToats("登入成功");
                     break;
             }
    }
}

public class DialogUtils {
    private Context context;
    private static  DialogUtils mInstance;
    private ProgressDialog progressDialog;
    private DialogUtils(Context context){
        this.context=context;
    }
    //雙重檢驗鎖的單例模式
public static DialogUtils getmInstance(Context context){
             if(mInstance==null){
                 synchronized (DialogUtils.class){
                     if (mInstance==null){
                         mInstance=new DialogUtils(context);
                     }
                 }
             }
             return mInstance;
    }
    //顯示
public void showprogressDialog(String msg){
        progressDialog=new ProgressDialog(context);
        progressDialog.setCancelable(true);//是否點選外部消失
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);//顯示效果
progressDialog.setMessage(msg);
        progressDialog.show();

    }
    //隱藏
public void hideprogressDialog(String msg){
        if(progressDialog!=null&&progressDialog.isShowing()){
            progressDialog.dismiss();
        }

    }
}