在 Android 中以编程方式添加 LinearLayout 不起作用 [英] Adding LinearLayout programmatically in Android doesn't work

问题描述

层次结构是这样的:

• 相对布局
  • 线性布局(垂直)
    • FrameLayout(权重 5)
      • 图像视图

      视图只是用于间距目的的虚拟视图.我在布局 xml 中做了它并且它有效.但是当我想以编程方式进行时，以下代码不起作用.

      The View is just a dummy view for spacing purpose. I did it in the layout xml and it works. But when I want to do it programmatically, the following codes do not work.

      LinearLayout LL = new LinearLayout(this);
      ImageView ladder = new ImageView(this);
      FrameLayout ladderFL = new FrameLayout(this);
      View dummyView = new View(this);
      ladder.setImageResource(R.drawable.ladder1);
      LL.setOrientation(LinearLayout.VERTICAL);
      LayoutParams LLParams = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
      LinearLayout.LayoutParams ladderFLParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, 0);
      ladderFLParams.weight = 5f;
      LinearLayout.LayoutParams dummyParams = new LinearLayout.LayoutParams(0,0);
      dummyParams.weight = 1f;
      
      FrameLayout.LayoutParams ladderParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.BOTTOM);
      ladder.setLayoutParams(ladderParams);
      ladderFL.setLayoutParams(ladderFLParams);
      dummyView.setLayoutParams(dummyParams);
      LL.setWeightSum(6f);
      LL.setLayoutParams(LLParams);
      
      ladderFL.addView(ladder);
      LL.addView(ladderFL);
      LL.addView(dummyView);
      ((RelativeLayout) findViewById(R.id.screenRL)).addView(LL);
      

      推荐答案

      LinearLayout LL = new LinearLayout(this);
          LL.setBackgroundColor(Color.CYAN);
          LL.setOrientation(LinearLayout.VERTICAL);
      
          LayoutParams LLParams = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
      
          LL.setWeightSum(6f);
          LL.setLayoutParams(LLParams);
      
      
          ImageView ladder = new ImageView(this);
          ladder.setImageResource(R.drawable.ic_launcher);
      
          FrameLayout.LayoutParams ladderParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.BOTTOM);
          ladder.setLayoutParams(ladderParams);
      
          FrameLayout ladderFL = new FrameLayout(this);
          LinearLayout.LayoutParams ladderFLParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, 0);
          ladderFLParams.weight = 5f;
          ladderFL.setLayoutParams(ladderFLParams);       
          ladderFL.setBackgroundColor(Color.GREEN);
          View dummyView = new View(this);
      
          LinearLayout.LayoutParams dummyParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,0);
          dummyParams.weight = 1f;
          dummyView.setLayoutParams(dummyParams);
          dummyView.setBackgroundColor(Color.RED);
      
      
      
          ladderFL.addView(ladder);
          LL.addView(ladderFL);
          LL.addView(dummyView);
          RelativeLayout rl=((RelativeLayout) findViewById(R.id.screenRL));
          rl.addView(LL);
      

      为了更好的理解，我刚刚整理了你的代码，还给了它一个背景颜色以获得清晰的图片，因为我不知道你想要什么，你可以通过它.我希望它有帮助.您应该提供您的工作 xml，以便我们确切地知道您想要什么.

      I have just arranged your code for better understanding, also gave it a background color to get the clear picture as I dont know what you want, you can go through it. I Hope it is helpful. You should provide your working xml so we know exactly what you want.

      这篇关于在 Android 中以编程方式添加 LinearLayout 不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！