Let’s talk about how to define native methods in uniapp

Uniapp is a cross-platform development framework based on the Vue.js framework. It can help developers convert Vue.js code into native applications or web applications. In uniapp, defining native methods is very simple. This article will introduce how to define native methods in uniapp.

1. Steps to define native methods in uniapp

In uniapp, defining native methods requires the following steps:

1.1 Define method names and parameters

First, you need to define the name of the native method you want to create and the parameters it requires. Suppose you want to create a method called "showToast". This method requires a string as a parameter to display a short toast prompt. You can define this method in a js file named "nativeMethod.js".

Write the following code in the js file:

export default {
  showToast (msg) {
    // Your native code to show toast here
  }
}

In the above code, you can see that a method named "showToast" is defined. It has a parameter called "msg" which represents the toast text to be displayed.

1.2 Implement the method in native code

Now we need to implement the "showToast" method in native code. Under the Android platform, you can use Java code to implement this method.

In your Android project, open the MainActivity.java file and add the following code:

import android.widget.Toast;
import com.alibaba.fastjson.JSONObject;
import io.dcloud.feature.uniapp.common.UniJsBridgeMsg;

// ...

public class MainActivity extends AppCompatActivity {
  // ...

  @Override
  public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
    super.onCreate(savedInstanceState, persistentState);

    UniJsBridgeMsg.addMethod("showToast", new UniJsBridgeMsg.BridgeCallback() {
      @Override
      public JSONObject onCallBack(JSONObject param, int callBackId) {
        String message = param.getString("msg");
        Toast.makeText(mActivity, message, Toast.LENGTH_SHORT).show();
        return null;
      }
    });
  }
}

In the above code, we use the Toast.makeText() method to create a toast and shows it. This method sets the toast text using the parameters passed to it.

Note that when adding a method using the UniJsBridgeMsg.addMethod() function, you need to provide the method name "showToast", callback function and return the JSON object of the parameters.

1.3 Call the native method

Now we have defined a native method named "showToast" and implemented it. We can use this method in vue files. In the vue file, we need to introduce the "nativeMethod.js" module defined previously. You can write like this:

import nativeMethod from "../../path/to/nativeMethod.js";

nativeMethod.showToast("Hello, world!");

When we run the application and call the local method on the page, a short Toast prompt will appear.

2. Summary

In this article, we introduced how to define native methods in uniapp and demonstrated a specific example. Although we only demonstrated the method of creating native methods on the Android platform, the method of implementing them on the iOS platform is similar. Using uniapp, you can create and manage native methods in a unified and simple way in the Vue.js framework.

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