android - 将按钮添加到 Android 中的 onDraw 调用

Question

我正在使用下面的代码来绘制简单的 2D 图形(我在 DroidNova 上找到的——非常有用!)，我想添加一个我在 XML 文件中定义的按钮(字符串名称和位置)。我看不到如何将按钮添加到屏幕(同时仍然显示来自 onDraw 调用的图形...

更新

我已经根据答案更新了下面的代码。我可以绘制矩形，但它不显示按钮。

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Drawresult();
    }

    protected void Drawresult() {
        // Create a new linear layout to display out custom graphics and a button.
        LinearLayout mainLayout = new LinearLayout(this);
        mainLayout.setOrientation(LinearLayout.VERTICAL);

        // Add our custom panel.
        mainLayout.addView(new Panel(this));

        // Create and setup our button.
        Button myButton = new Button(this);
        myButton.setText("Tap Me");
        myButton.setOnClickListener(new OnClickListener() {

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

         // Add our button to the layout.
         mainLayout.addView(myButton);

         // Set this activity's content to our layout.
         setContentView(mainLayout);
     }

     class Panel extends View {
         public Panel(Context context) {
             super(context);
         }

         @Override
         public void onDraw(Canvas canvas) {

             Rect r = new Rect();
             r.set(60, 60, 260, 77);

             Paint paint = new Paint();
             paint.setColor(Color.WHITE);
             paint.setStyle(Paint.Style.STROKE);
             paint.setStrokeWidth(3);

             canvas.drawRect(r, paint);
         }
     }
}

Answer 1

将你的构造函数更改为这个(假设你有子类 Activity 。否则发布更多你的代码):

protected void Drawresult() {
    // Create a new linear layout to display out custom graphics and a button
    LinearLayout mainLayout = new LinearLayout(this);
    mainLayout.setOrientation(LinearLayout.VERTICAL);

    // Add our custom panel
    mainLayout.addView(new Panel(this));

    // Create and setup our button 
    Button myButton = new Button(this);
    myButton.setText("Tap Me");
    myButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // Put your click logic here
        }
    });

    // Add our button to the layout
    mainLayout.addView(myButton);

    // Set this activity's content to our layout
    setContentView(mainLayout);
}