android - 如何在 Android 中制作类似 "Notification"类的类？

Question

最近我一直在学习如何在 Android 中构建通知，我遇到了这个:

NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.test_image)
                .setLargeIcon(largeIcon)
                .setContentTitle("Notification Compat")
                .setContentText("Notification area --> 
                Modifiable!").setNumber(num);

不管我怎么写代码，结果都是一样的。例如，如果我更改顺序，则在 setContentTitle() 之前调用 setContentText()。它返回相同的 Notification Builder 对象。代码:

NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.test_image)
                .setLargeIcon(largeIcon)
                .setContentText("Notification area --> Modifiable!") // Modification
                .setContentTitle("Notification Compat").setNumber(num);

谁能告诉我这怎么可能？谢谢。

Answer 1

Here是如何创建 Builder 模式 的示例。

示例

public class FooBar {
   private int mA, mB;

   private FooBar(int a, int b) {
      this.mA = a;
      this.mB = b;
   }

   public int getA() {
      return mA;
   }

   public void setA(int a) {
      this.mA = a;
   }

   public int getB() {
      return mB;
   }

   public void setB(int b) {
      this.mB = b;
   }

   public static class FooBarBuilder {
      private int mNestedA, mNestedB;

      public FooBarBuilder() {
          this.mNestedA = 0;
          this.mNestedB = 0;
      }

      public FooBarBuilder(int nestedA, int nestedB) {
          this.mNestedA = nestedA;
          this.mNestedB = nestedB;
      }

      public int getNestedA() {
          return mNestedA;
      }

      public FooBarBuilder setNestedA(int nestedA) {
          this.mNestedA = nestedA;
          return this;
      }

      public int getNestedB() {
          return mNestedB;
      }

      public FooBarBuilder setNestedB(int nestedB) {
          this.mNestedB = nestedB;
          return this;
      }

      public FooBar create() {
          return new FooBar(mNestedA, mNestedB);
      }
   }
}