Android的自定義視圖和可見按鈕

Question

我做了我的自定義視圖，我想補充view.button，所以我做了這個解決方案：

Public void onCreate(Bundle savedInstanceState) 
{ 
    Button up; 
    up = new Button(getApplicationContext()); 
    up.setText("ahoj"); 
    up.setHeight(100); 
    up.setWidth(100); 
    up.setTop(200); 
    up.setLeft(100); 
    LinearLayout layout = new LinearLayout(getApplicationContext()); 
    super.onCreate(savedInstanceState); 
    setContentView(layout); 

    myview view = new myview(this); 
    layout.addView(view); 

layout.addView(up); 

我只看到我的看法，但沒有按鈕。我的視圖只繪製一些PNG文件。有誰知道問題在哪裏？非常感謝。

Answer 1

最有可能的原因是您的自定義視圖添加了佈局參數MATCH_PARENT。它需要整個佈局，並且按鈕不可見。嘗試不是與WRAP_CONTENT PARAMS添加自定義視圖：

MyView view = new myview(this); 
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LAYOUTParams.WRAP_CONTENT) 
layout.addView(view, lp); 

Answer 2

你有正確的代碼，但在錯誤的順序。試試這個：

Public void onCreate(Bundle savedInstanceState) 
{ 
    Button up; 
    LinearLayout layout = new LinearLayout(getApplicationContext()); 
    up = new Button(getApplicationContext()); 
    up.setText("ahoj"); 
    up.setHeight(100); 
    up.setWidth(100); 
    up.setTop(200); 
    up.setLeft(100); 




    myview view = new myview(this); 
    layout.addView(view); 
    layout.addView(up); 

    setContentView(layout); 
    super.onCreate(savedInstanceState); 
}