Question

我正在尝试在主要活动上显示2个（和更多）方格，并在点击其中一个方格时显示一条消息，其中包含方形的数字。我的问题是只显示第一个方块（屏幕上只有一个蓝色方块，仅此而已）。

MainActivity

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.blank);

    final LinearLayout mContainer = (LinearLayout)findViewById(R.id.blank);

    View sq1 = new MyView(this, 0, 100, 100, Color.BLUE);
    View sq2 = new MyView(this, 1, 200, 200, Color.GREEN);

    mContainer.addView(sq1,0);
    mContainer.addView(sq2,1);
}}

可绘制的课程

public class MyView extends View implements OnClickListener{
private final Context context;
private final int index;
private ShapeDrawable mDrawable;

public MyView(Context context, int index, int xPos, int yPos, int color) {
    super(context);

    this.index = index;
    this.context = context;
    setOnClickListener(this);

    int x = xPos;
    int y = yPos;
    int width = xPos;
    int height = yPos;

    mDrawable = new ShapeDrawable(new RectShape());
    mDrawable.getPaint().setColor(color);
    mDrawable.setBounds(x, y, x + width, y + height);
}

protected void onDraw(Canvas canvas) {
    mDrawable.draw(canvas);
}

public void onClick(View v) {
    Toast.makeText(context, index+1+". view clicked.", Toast.LENGTH_SHORT).show();
}}

blank.xml

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

Answer 1

您的例子中遗漏了两件事：

首先：您必须将LayoutParams设置为您的视图。

LayoutParams paramsSq1 = new LayoutParams(100,100);
LayoutParams paramsSq2 = new LayoutParams(200,200);

View sq1 = new MyView(this, 0, 100, 100, Color.BLUE);
sq1.setLayoutParams(paramsSq1);


View sq2 = new MyView(this, 1, 200, 200, Color.GREEN);
sq2.setLayoutParams(paramsSq2);

mContainer.addView(sq1, 0);
mContainer.addView(sq2, 1);

其次：从原点（0,0）绘制形状。

  public MyView(Context context, int index, int xPos, int yPos, int color) {
    super(context);

    this.index = index;
    this.context = context;
    setOnClickListener(this);

    int x = 0;
    int y = 0;
    int width = xPos;
    int height = yPos;

    mDrawable = new ShapeDrawable(new RectShape());
    mDrawable.getPaint().setColor(color);
    mDrawable.setBounds(x, y, x + width, y + height);
  }

Answer 2

我认为您需要为LayoutParams的孩子设置LinearLayout。

试试这个：

LinearLayout mContainer = (LinearLayout) findViewById(R.id.blank);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

mContainer.addView(sq1, params);
mContainer.addView(sq2, params);

如何在Android上的活动布局中显示我的自定义Drawable

2 个答案: