新文章：parcelable页面间传递实例对象

2020/03/parcelable_serializable.md

@@ -0,0 +1,77 @@
+# [parcelable页面间传递实例对象](/2020/03/parcelable_serializable.md)
+
+Parcelable类似JDK的Serializable接口，用于序列化传输Java实例对象
+
+<!-- tabs:start -->
+
+#### **model**
+
+```java
+public static class Product implements Parcelable {
+    public String name;
+    public boolean is_purchasable;
+
+    /**
+     * Parcelable序列化
+     */
+    Product(Parcel in) {
+      name = in.readString();
+      is_purchasable = in.readByte() != 0;
+    }
+
+    /**
+     * Parcelable序列化
+     */
+    public static final Creator<Product> CREATOR = new Creator<Product>() {
+      @Override
+      public Product createFromParcel(Parcel in) {
+        return new Product(in);
+      }
+
+      @Override
+      public Product[] newArray(int size) {
+        return new Product[size];
+      }
+    };
+
+    /**
+     * Parcelable「反」序列化
+     */
+    @Override
+    public int describeContents() {
+      return 0;
+    }
+
+    /**
+     * Parcelable「反」序列化
+     */
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+      dest.writeString(name);
+//      dest.writeBoolean(is_purchasable);
+      // writeBoolean是kotlin特有的方法，用不了
+      dest.writeByte((byte) (is_purchasable ? 1 : 0));
+    }
+  }
+```
+
+#### **send parcelable**
+
+```java
+holder.itemView.setOnClickListener(v -> {
+  Intent intent = new Intent(v.getContext(), CurrencyDetailActivity.class);
+  intent.putExtra("product", product);
+  v.getContext().startActivity(intent);
+});
+```
+
+#### **receive parcelable**
+
+```java
+if (!getIntent().hasExtra("product")) {
+  return;
+}
+binding.setProduct(getIntent().getParcelableExtra("product"));
+```
+
+<!-- tabs:end -->

sidebar.md

@@ -1,5 +1,6 @@
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+    - [parcelable页面间传递实例对象](/2020/03/parcelable_serializable.md)
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