对话框改变颜色 宽度沾满屏幕 Dialog

首先在style.xml中定义一个对话框样式，这里可以修改颜色：

//对话框沾满整个屏幕的宽度
<style name="DialogShareTheme" parent="Theme.AppCompat.Dialog">
    <item name="android:background">@color/white</item>
    <item name="android:windowBackground">@color/transparent</item>
</style>

接着编写对话框的布局文件，这里就只写了一个按钮：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Test"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

java代码中：

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(ProductionInformationActivity.this, R.style.DialogShareTheme); //加入样式
final View dialogView = LayoutInflater.from(ProductionInformationActivity.this).inflate(R.layout.dialog_share,null);  //加入布局
dialogBuilder.setView(dialogView);
Dialog dialog = dialogBuilder.create();
dialog.getWindow().setGravity(Gravity.BOTTOM);
dialog.show();
WindowManager.LayoutParams p = dialog.getWindow().getAttributes();
p.width = MyApp.getScreenWidth(this); //设置dialog的宽度为当前手机屏幕的宽度
dialog.getWindow().setAttributes(p);

效果：