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在Android中以编程方式添加LinearLayout不起作用

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层次结构如下：

  • RelativeLayout

  • LinearLayout（垂直）

  • FrameLayout（重量5）

  • ImageView

  • 查看（重量1）

视图只是用于间距目的的虚拟视图 . 我在布局xml中做了它，它的工作原理 . 但是当我想以编程方式执行此操作时，以下代码不起作用 .

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);
android android-layout android-linearlayout

1 回答

  • 61
    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);

    我刚刚安排了你的代码以便更好地理解，并给它一个背景色以获得清晰的画面，因为我不知道你想要什么，你可以通过它 . 我希望它有所帮助 . 您应该提供您的工作xml，以便我们确切地知道您想要什么 .

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