如何设置画布大小？

Question

我有一个名为SeatsPanel的类,我在onDraw方法中绘制座位(使用drawRect).onDraw方法使用Canvas作为参数,但是如何设置Canvas的大小？我问这个问题的原因是因为这个课在另一堂课中被夸大了.我知道画布具有手机的默认高度和宽度,但我需要将其缩小.我怎样才能做到这一点？

任何帮助,将不胜感激.

-Tolga-

Answer 1

我尝试实现一个简单的应用程序，该应用程序在主要活动中绘制一个黑色矩形，该矩形是通过按下按钮绘制的。例如，在MainActivity：

    private Button button1;
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    button1=(Button)findViewById(R.id.button);
    button1.setOnClickListener(new OnClickListener(){

            public void onClick(View v) {
             switch(v.getId()){
                case R.id.button:

                     LinearLayout ll=(LinearLayout)findViewById(R.id.linearLayout1);
                     System.out.println(ll.getWidth()+" "+ll.getHeight());
                     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ll.getWidth(),ll.getHeight());
                     YourView yourView = new YourView(getBaseContext());
                     yourView.setBackgroundColor(Color.WHITE);
                     ll.addView(yourView,params);
                    break;
             }

        }

    });

}

并在YourView课堂上：

    private Bitmap savedBitmap;
public YourView(Context context) {
    super(context);
}
public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    System.out.println(canvas.getWidth()+" "+canvas.getHeight());

    Paint textPaint = new Paint();
    textPaint.setARGB(255, 0, 0, 0);
    textPaint.setTextAlign(Paint.Align.RIGHT);
    textPaint.setTextSize(11);
    textPaint.setTypeface(Typeface.DEFAULT);

    canvas.drawColor(Color.WHITE);
    System.out.println(canvas.getWidth());
    System.out.println(canvas.getHeight());

    canvas.drawRect(200, 20, 500, 100, textPaint);
}

main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Push the button and draw a Rect" />

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Button" />




<LinearLayout
    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

</LinearLayout>