如何從視圖移動到活動並回到android

Question

我有兩個類A和B A是主要活動類，B是視圖類。現在我正在通過setcontentview調用View。當視圖是活動的，我正在繪製它。我希望活動課是活躍的，所以我該怎麼做？

public class A extends Activity { 
    B b; 


    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
             WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.button); 
     b = new B(this); 

     Button but = (Button) findViewById(R.id.showView); 
     but.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 

       setContentView(drawView); 
       drawView.requestFocus(); 
      } 
     }); 

    } 
} 

public class b extends View implements OnTouchListener { 


    public DrawView(Context context) { 
     super(context); 
     setFocusable(true); 

     mContext = context; 
     setFocusableInTouchMode(true); 
     this.setBackgroundColor(Color.WHITE); 
     this.setOnTouchListener(this); 

     paint.setColor(Color.GRAY); 
     paint.setAntiAlias(true); 




    } 
public void onDraw(Canvas canvas) { 

     mCanvas = canvas; 
draw something 
} 


} 

Answer 1

setContentView()取代了Activity的整個視圖。如果您想返回舊視圖，請再次使用舊視圖調用setContentView()。按照慣例，這是不好的。一般來說，你只能爲每個活動做一個視圖