圆角LinearLayout

Question

我正在以编程方式从LinearLayout创建一个listview数组，我想制作圆角，所以我创建了一个像这样的可绘制资源

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="40dp"
        />

    <padding
        android:top="2dp"
        android:bottom="2dp"
        android:left="2dp"
        android:right="2dp"/>
</shape>

LinearLayout的代码是这个

LinearLayout linearLayout= new LinearLayout(getContext());
            linearLayout.setOrientation(LinearLayout.VERTICAL);

        LinearLayout.LayoutParams layout= new LinearLayout.LayoutParams(
                200,
                100
        );


        layout.setMargins(20,20,20,20);

        linearLayout.setLayoutParams(layout);
        linearLayout.setBackgroundColor(Color.BLUE);
        linearLayout.setBackgroundResource(R.drawable.rounded);
        linearLayout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.i("Test selected","");
                v.setBackgroundColor(Color.RED);

                return false;
            }
        });

问题是元素的形状不是圆形的。我的错在哪里？感谢每一个抱歉我的英语。

Answer 1

使布局具有圆角：

1. 您必须定义一个xml文件，其中包含在res / drawable中具有名称rounded.xml的圆角属性（您可以保存任何名称）

   形状   的xmlns：机器人= “http://schemas.android.com/apk/res/android”   机器人：形状= “矩形” ＆GT;

   <gradient
       android:endColor="#000000"
       android:startColor="#000000"/>
   
   <corners
       android:bottomRightRadius="7dp"
       android:bottomLeftRadius="7dp"
       android:topLeftRadius="7dp"
       android:topRightRadius="7dp"/>
   

2. 将您的活动定义为：

   LinearLayout linearLayout;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
   
       linearLayout= new LinearLayout(getApplicationContext());
       linearLayout.setOrientation(LinearLayout.VERTICAL);
   
   //Use framelayout.layoutparams not linearlayout.layoutparams
       FrameLayout.LayoutParams layout= new FrameLayout.LayoutParams(200,100);   
   
   //Use setContentView to show this layout in your activity
       setContentView(linearLayout,layout);
   
       layout.setMargins(50,50,50,50);
   
       linearLayout.setLayoutParams(layout);
       linearLayout.setBackgroundColor(Color.BLUE);
       linearLayout.setBackgroundResource(R.drawable.rounded);
       linearLayout.setOnTouchListener(new View.OnTouchListener() {
   
       @Override
       public boolean onTouch(View v, MotionEvent event) {
           Log.i("Test selected","");
           v.setBackgroundColor(Color.RED);
   
           return false;
       }
   });
   

我查了一下：

        FrameLayout.LayoutParams layout= new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

布局的颜色在rounded.xml中设置为黑色

输出是：