h5混合开发有时需要调用本地的代码，就是js和原生代码交互。当然rn的封装和调用都很方便，现在用下cordova封装自定义插件plugin，cordova和phonegap的关系自行百度吧，当然cordova的安装此处也省略。
首先以 js 调用安卓的Toast为例，显示Toast提示，同时android studio中Log 一下。
具体怎么做，下面然后我们来一件一件的抽肢剖解
当然新建一个android 工程，比如这样
![3.gif]()
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然后 导入CordovaLib 在建的工程里 在Cordova 新建的项目里有这个 复制出来导入到 android studio中就好了
![f7d1cb17eae5e637d69d3bec42afbfc1b746677f]()
![5bdd956440629b635213e35873041b34606a186b]()
package plugins.com.test;
import android.util.Log;
import android.widget.Toast;
import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;
import org.json.JSONArray;
import org.json.JSONException;
/**
* Created by Administrator on 2018/1/18.
*/
public class Demo extends CordovaPlugin{
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
if (action.equals("demoToast")) {
String string = args.getString(0);
this.demoToast(string, callbackContext);
return true;
}
return false;
}
private void demoToast(String str, CallbackContext callbackContext) {
Log.i("demo", "demo_demo");
if (str != null || str.length() > 0) {
Toast.makeText(cordova.getActivity(), str, Toast.LENGTH_LONG).show();
callbackContext.success(str);
} else {
callbackContext.error("str 不能为空~~~!!");
}
}
}
写到这里需要用plugman 打包插件了 先安装plugman npm install plugman -g
plugman create --name 插件名 --plugin_id 插件ID --plugin_version 插件版本号
如下图 三个步骤
![22500f872913a65507a3ae242857c574d4489ac0]()
把java代码复制到 src目录下 新建android 目录
![7cdb896c25b14d117c1558c11383e1fd1d992b94]()
var exec = require('cordova/exec');
module.exports = {
demoToast: function (arg0, success, error) {
exec(success, error, 'Demo', 'demoToast', [arg0]);
}
}
plugin.xml 配置
<?xml version='1.0' encoding='utf-8'?>
<plugin id="plugins.com.demo" version="1.0.0" xmlns="http://apache.org/cordova/ns/plugins/1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<name>plugins-com-demo</name>
<js-module name="demo" src="www/plugins-com-demo.js">
<clobbers target="Demo" /><!--Demo 为 demo的类名 写错了 alert 提示err class not found -->
</js-module>
<platform name="android">
<config-file target="res/xml/config.xml" parent="/*">
<feature name="Demo">
<param name="android-package" value="plugins.com.demo.Demo"/> <!--Demo 类的 完成路径 -->
</feature>
</config-file>
<source-file src="src/android/Demo.java" target-dir="src/plugins/com/demo"/><!--Demo 在android工程里 src下的全路径 -->
</platform>
</plugin>
插件就完成了，需要在cordova 新建的项目中加入此插件
新建一个 项目 步骤如下
cordova create test
进入test 目录
cd test
cordova platform add android
加入插件如下图
![69f39aa9513f691f425fd2043090f15f64d35ebb]()
cordova plugin add c:\插件路径\plugins-com-demo
在新建的 test 项目下 www\js\index.js中加入如下代码
onDeviceReady: function() {
Demo.demoToast('ok, ok!!!', function(str) {
alert(str + 'succc')
}, function(err) {
alert(err)
});
this.receivedEvent('deviceready');
},
同理设置点击
<h1 id="demo">click me click me</h1>
onDeviceReady: function() {
this.receivedEvent('deviceready');
document.getElementById('demo').addEventListener('click', function(e) {
demo.demoToast('ok, ok!!!', function(str) {
alert(str + 'succc')
}, function(err) {
alert(err)
});
})
},
cordova run android
这样做不是目的，下面把视频播放用安卓代码播放
首先创建一个 activity_video.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="你好-new-activity" />
<VideoView
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="@+id/videView"/>
</LinearLayout>
对应的VideoActivity.class
package plugins.com.demo;
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;
/**
* Created by Administrator on 2018/1/22.
*/
public class VideoActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new);
VideoView videoView = (VideoView)findViewById(R.id.videView);
MediaController mc = new MediaController(this);
videoView.setVideoURI(Uri.parse("http://127.0.0.1:8888/Test/2017.mp4"));
videoView.setMediaController(mc);
videoView.start();
}
}
MainActivity里唤起newActivity
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="plugins.com.demo.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintLeft_creator="1"
android:id="@+id/textView" />
<Button
android:layout_width="291dp"
android:layout_height="49dp"
android:text="newActive"
android:layout_marginStart="27dp"
app:layout_constraintBaseline_toBaselineOf="@+id/textView"
tools:layout_constraintBaseline_creator="1"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="36dp"
android:id="@+id/btnNewActivity"/>
</android.support.constraint.ConstraintLayout>
![3e0d86ec69347b7110f06837957c18b8a657a243]()
记得加入网络读权限
同时加入js 可以调用的类VideoNewActivity.java
public class VideoNewActivity extends CordovaPlugin{
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
super.execute(action, args, callbackContext);
if (action.equals("showVideo")) {
Context ctx = cordova.getActivity().getApplicationContext();
Intent viodeIntent = new Intent(ctx, VideoActivity.class);
this.cordova.getActivity().startActivity(viodeIntent);
return true;
}
return false;
}
}
在安卓项目下完成组件的java代码，剩下的就是打包插件 同样的味道还是 plugman,
但是这样直接打包是不对的cordova不能直接识别findViewById, so改下android代码
public class VideoNewActivity extends CordovaPlugin{
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
super.execute(action, args, callbackContext);
if (action.equals("showVideo")) {
Context ctx = cordova.getActivity().getApplicationContext();
Intent viodeIntent = new Intent(ctx, VideoActivity.class);
this.cordova.getActivity().startActivity(viodeIntent);
return true;
}
return false;
}
}
public class VideoActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String packageName = getApplication().getPackageName();
setContentView(getApplication().getResources().getIdentifier("activity_video", "layout", packageName));
int video = getApplication().getResources().getIdentifier("videView", "id", packageName);
VideoView videoView = (VideoView)findViewById(video);
MediaController mc = new MediaController(this);
videoView.setVideoURI(Uri.parse("http://127.0.0.1:8888/Test/2017.mp4"));
videoView.setMediaController(mc);
videoView.start();
}
}
onDeviceReady: function() {
this.receivedEvent('deviceready');
document.getElementById('demo').addEventListener('click', function(e) {
VideoNewActivity.playVideo('click', function(e) {
alert(str + 'video-succc')
}, function(err) {
alert(err)
});
})
},
plugins-com-video.js
var exec = require('cordova/exec');
module.exports = {
playVideo: function (arg0, success, error) {
exec(success, error, 'VideoNewActivity', 'showVideo', [arg0]);
}
}
plugin.xml配置如下
<?xml version='1.0' encoding='utf-8'?>
<plugin id="plugins.com.VideoNewActivity" version="1.0.0" xmlns="http://apache.org/cordova/ns/plugins/1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<name>VideoNewActivity</name>
<js-module name="VideoNewActivity" src="www/plugins-com-video.js">
<clobbers target="VideoNewActivity" />
</js-module>
<platform name="android">
<config-file target="res/xml/config.xml" parent="/*">
<feature name="VideoNewActivity">
<param name="android-package" value="plugins.com.demo.VideoNewActivity"/>
</feature>
</config-file>
<source-file src="src/android/VideoNewActivity.java" target-dir="src/plugins/com/demo"/>
<config-file target="AndroidManifest.xml" parent="/manifest/application">
<!-- /manifest/application activity 才能写入 application 里 -->
<uses-permission android:name="android.permission.INTERNET" />
<activity android:label="VideoActivity" android:name="plugins.com.demo.VideoActivity"></activity>
</config-file>
<config-file parent="/*" target="AndroidManifest.xml"></config-file>
<source-file src="src/android/VideoActivity.java" target-dir="src/plugins/com/demo"/>
<source-file src="src/android/activity_video.xml" target-dir="res/layout"/>
</platform>
</plugin>
注意activity引入的位置
来看个效果图吧···如下····
![a24a1cc37c2756c8a726283a199ecf40c918c2b1]()
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有不完善敬请更正··········
