如何在Android中动态设置保证金？

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方法不起作用

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,它可能对您有所帮助.

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();

使用LinearLayout.LayoutParams或RelativeLayout.LayoutParams根据子视图的父布局

Answer 2

只是分享一种稍微不同的方法。

您可以直接强制转换为LinearLayout.LayoutParams，而不是强制转换为、RelativeLayout.LayoutParams等MarginLayoutParams。

强制转换MarginLayoutParams为更好，因为您可以稍后更新您的布局，并且您不需要返回到您的 java 代码来更改从LinearLayouttoRelativeLayout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);