如何以编程方式设置layout_gravity ?

我的问题很简单，

如何设置我的按钮layout_gravity编程?

我在互联网上找到了这个，但它只是抛出了一个空指针异常:

 Button MyButton = new Button(this);

    LinearLayout.LayoutParams  lllp=(LinearLayout.LayoutParams)MyButton.getLayoutParams();
    lllp.gravity=Gravity.RIGHT;
    MyButton.setLayoutParams(lllp); 


    MyLinearLayout.addView(MyButton);

有解决方案吗?

当前回答

如果你想改变现有视图的layou_gravity，可以这样做:

((FrameLayout.LayoutParams) view.getLayoutParams()).gravity = Gravity.BOTTOM;

记住要根据视图所在的布局类型使用正确的LayoutParams。例:

LinearLayout.LayoutParams

2015-04-27 07:48:19

其他回答

 int width=getResources().getDisplayMetrics().widthPixels; 
 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams
                    (width, width);

            params.gravity = Gravity.CENTER;

           iv_main_text = new HTextView(getContext());
            iv_main_text.setLayoutParams(params);
            iv_main_text.setBackgroundColor(Color.BLUE);
            iv_main_text.setTextSize(60);
            iv_main_text.setGravity(Gravity.CENTER);
            iv_main_text.setTextColor(Color.BLACK);

2018-08-28 09:47:13

Java

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
params.weight = 1.0f;
params.gravity = Gravity.TOP;

button.setLayoutParams(params);

科特林

val params = LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT,
    LinearLayout.LayoutParams.WRAP_CONTENT
).apply {
    weight = 1.0f
    gravity = Gravity.TOP
}

对于重力值和如何设置重力检查重力。

基本上，你应该根据父类选择LayoutParams。它可以是RelativeLayout, LinearLayout等等…

2011-11-08 11:44:38

以上大部分答案都是对的，所以写了一个辅助方法，让你可以使用它直接在你的项目中。

以编程方式设置layout_gravity

// gravity types : Gravity.BOTTOM, Gravity.START etc.
// view : can be any view example : button, textview, linearlayout, image etc.

// for single view
   public static void setLayoutGravity(int gravity, View view){
     ((LinearLayout.LayoutParams) view.getLayoutParams()).gravity = gravity;
    }


// for mulitple views
  public static void setLayoutGravity(int gravity, View ...view){
        for(View item : view)
            ((LinearLayout.LayoutParams) item.getLayoutParams()).gravity = gravity;
    }

2019-08-29 12:12:00

完美的工作! !以上答案都不适合我。在Xml文件中设置gravity和设置layout_gravity是不同的。检查下面的代码

// here messageLL is the linear layout in the xml file
// Before adding any view just remove all views
   messageLL.removeAllViews();
// FrameLayout is the parent for LinearLayout
FrameLayout.LayoutParams params = new 
   FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
   params.gravity = Gravity.CENTER|Gravity.CENTER_VERTICAL;
   messageLL.setLayoutParams(params);
   messageText.setVisibility(View.GONE);
   messageNoText.setVisibility(View.VISIBLE);
   messageLL.addView(messageNoText);

也检查这个，在那里你可以找到关于重力和layout_gravity的清楚解释。

2017-07-11 07:19:11

我使用类似这样的东西:(Xamarin和c#代码)

  LinearLayout linLayout= new LinearLayout(this); 
    linLayout.SetGravity(GravityFlags.Center);

    TextView txtView= new TextView(this);  
     linLayout.AddView(txtView);

SetGravity把我的textView放在布局的中心。 SetGravity layout属性引用布局内容

2014-09-05 07:45:00

如何以编程方式设置layout_gravity ?

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