怎样 从android 原生跳转到 uniapp 登陆页面

Question

正在开发一个app, 大部分代码是uniapp写的，其中一个功能块（暂时称 模块B）是用android写的，整个APP是把uni代码 本地打包后放进AS 中app assets目录下运行的。

现有一个问题，模块B需要分享功能，分享出去通过H5页面打开模块B，需要判断是否登陆，如果没有登陆则跳转到 登陆页面（登陆页面是用uniapp写的）。问题是怎样 从android 原生跳转到 uniapp 登陆页面 呢？ 求解！！

Answer 1

注意：在android studio需配置好离线打包环境

uni-app端，将底下两个方法放入methods

        nativeJs(successCallback, errorCallback) {
             return plus.bridge.exec("bridge", "goMainActivity", [plus.bridge.callbackId(typeof successCallback === 'function' ? successCallback : null, typeof errorCallback === 'function' ? errorCallback : null)]);
         },
        
        openLockSelect(){
            
            this.nativeJs(res => {
                  uni.showToast({
                      title: res,
                      icon: 'none',
                      duration: 3000,
                      mask: false
                  });
              },
              fail =>  {
                   
              }); 
        },

android studio端

1.在dcloud_properties.xml添加（注意name与value的意思）

<feature name="bridge" value="com.coral3.helmet.raw.BridgeForUniApp"/>

2.BridgeForUniApp.java文件代码如下：

package com.coral3.helmet.raw;

import android.content.Intent;
import org.json.JSONArray;
import io.dcloud.common.DHInterface.IWebview;
import io.dcloud.common.DHInterface.StandardFeature;

public class BridgeForUniApp extends StandardFeature {
    public void goMainActivity(IWebview pWebview, JSONArray arr){
        Intent intent = new Intent(pWebview.getContext(), MainActivity.class);
        intent.putExtra("CallBackID", arr.optString(0));
        pWebview.getContext().startActivity(intent);
    }
}

3.MainActivity代码如下（注意核心方法toUniAppByParams）

`package com.coral3.helmet.raw;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.os.Bundle;
import android.os.Vibrator;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.coral3.helmet.R;
import java.util.ArrayList;
import io.dcloud.common.DHInterface.IWebview;
import io.dcloud.common.util.JSUtil;
import io.dcloud.feature.internal.sdk.SDK;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private TextView tvBack, openLockSuccess;
    private ImageView ivBtn;
    private View loadingView;
    private ViewGroup contentView;
    private Vibrator vibrator;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActionBar actionBar = getSupportActionBar();
        if(actionBar != null) actionBar.hide();
        setContentView(R.layout.activity_main);
        initViews();
        initListener();
        startLoading();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(2000);
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            stopLoading();
                            openLockSuccess.setVisibility(View.VISIBLE);
                            Toast.makeText(MainActivity.this, "hello", Toast.LENGTH_SHORT).show();
                            
                            vibrator.vibrate(2000);
                        }
                    });
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    private void initViews(){
        tvBack = findViewById(R.id.tv_back);
        ivBtn = findViewById(R.id.iv_back);
        openLockSuccess = findViewById(R.id.tv_lock_open_success);
        openLockSuccess.setVisibility(View.GONE);
        contentView = findViewById(android.R.id.content);
        vibrator = (Vibrator) MainActivity.this.getSystemService(Context.VIBRATOR_SERVICE);
    }

    private void initListener(){
        tvBack.setOnClickListener(this);
        ivBtn.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        toUniAppByParams("lys");
    }

    public void startLoading() {
        if (loadingView == null) {
            loadingView = LayoutInflater.from(this).inflate(R.layout.view_loading, null, false);
            contentView.addView(loadingView);
            Log.d("yue-tag", "startLoading");
        } else {
            loadingView.setVisibility(View.VISIBLE);
        }
    }

    public void stopLoading() {
        if (loadingView != null) {
            loadingView.setVisibility(View.GONE);
        }
    }

    
    private void toUniAppByParams(String params){
        ArrayList<IWebview> weblist = SDK.obtainAllIWebview("__UNI__3333333"); 
        for(int i = 0; i < weblist.size(); i ++){
            
            if(weblist.get(i).getOriginalUrl() != null){
                JSUtil.execCallback(weblist.get(i),getIntent().getStringExtra("CallBackID"), params, JSUtil.OK,false);
            }
        }
        
        finish();
    }
}` 

![](https://csdnimg.cn/release/blogv2/dist/pc/img/newCodeMoreWhite.png)