Question

我目前正在做一个包含自定义警报对话框的Android应用程序。它包含一个按钮，但我无法设置按钮的边距。代码如下。 setmargin方法无法正常工作

AlertDialog.Builder myDialog = new AlertDialog.Builder(Login.this);
Button button = new Button(Login.this);

button.setText("Send");
LayoutParams buttonLayoutParams 
    = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

button.setLayoutParams(buttonLayoutParams);

resetPassword=editText.getText().toString();

LinearLayout layout = new LinearLayout(Login.this);
layout.setOrientation(LinearLayout.VERTICAL);
layout.addView(textView);
layout.addView(editText);
layout.addView(button);

myDialog.setView(layout);

Answer 1

编写以下代码来设置保证金，它可能对您有帮助。

AlertDialog.Builder myDialog = new AlertDialog.Builder(Login.this);
Button button = new Button(Login.this);
EditText editText = new EditText(Login.this);
TextView textView = new TextView(Login.this);
button.setText("Send");
LinearLayout.LayoutParams buttonLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
buttonLayoutParams.setMargins(50, 10, 0, 0);
button.setLayoutParams(buttonLayoutParams);
String resetPassword = editText.getText().toString();
LinearLayout layout = new LinearLayout(Login.this);
layout.setOrientation(LinearLayout.VERTICAL);
layout.addView(textView);
layout.addView(editText);
layout.addView(button);
myDialog.setView(layout);
myDialog.show();

根据子视图的父布局

使用LinearLayout.LayoutParams或RelativeLayout.LayoutParams

Answer 2

buttonLayoutParams.bottomMargin
buttonLayoutParams.topMargin
buttonLayoutParams.leftMargin
buttonLayoutParams.rightMargin

可用于设置边距

Answer 3

如果您正在使用LinearLayout.LayoutParams，则setMargin（）方法可用，但如果您使用ViewGroup.LayoutParams则不可用。 Dipak Keshariya提到了这一点，但并没有用这么多的话说出来。

Answer 4

You can set in LinearLayout margin

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams layoutParams = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 
LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30, 20, 30, 0);
Button okButton=new Button(this);
okButton.setText("some text");
ll.addView(okButton, layoutParams);

Answer 5

只是分享一种略有不同的方法。

您无需强制转换为LinearLayout.LayoutParams，RelativeLayout.LayoutParams等，而只需强制转换为MarginLayoutParams。

将样式投射到MarginLayoutParams更好，因为您以后可以更新布局，而无需返回到Java代码即可从LinearLayout更改为RelativeLayout或任何其他布局类型

您可以执行以下操作：

MarginLayoutParams layoutParams = (MarginLayoutParams) view.getLayoutParams();

// Set bottom margin
layoutParams.bottomMargin = x;

// Set top margin
layoutParams.topMargin = x;

// Set left margin
// This won't have effect if you set any relative margin (start) previously or in the layout.xml
layoutParams.leftMargin = x;

// Set left margin
// This won't have effect if you set any relative margin (end) previously or in the layout.xml
layoutParams.rightMargin = x;

// Set start margin
layoutParams.setMarginStart(x);

// Set end margin
layoutParams.setMarginStart(x);

// Set all left, top, right, bottom margins at once
// Note that here, left and right margins are set (not start/end).
// So, if you have used start/end margin before (or via layout.xml), 
// setting left/right here won't have any effect.
layoutParams.setMargins(left, top, end, bottom)

// Then re-apply the layout params again to force the view to be re-draw
// This step may not be necessary because depending where you set the margin, 
// view is already scheduled to be drawn
// For any case, to ensure the view will apply the new margin, call:
view.setLayoutParams(layoutParams);

Answer 6

这对我有用（支持库（需要使用 AndroidX）：

科特林

val params = LinearLayoutCompat.LayoutParams(
               LinearLayout.LayoutParams.WRAP_CONTENT,
               LinearLayout.LayoutParams.WRAP_CONTENT
               ).apply {
                 setMargins(0,16,0,16)
               }

Java

LinearLayoutCompat.LayoutParams params = LinearLayoutCompat.LayoutParams(
                   LinearLayout.LayoutParams.WRAP_CONTENT,
                   LinearLayout.LayoutParams.WRAP_CONTENT
                   )
                   params.setMargins(0,16,0,16)

如何在Android中动态设置保证金？

6 个答案: