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example webmessage

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This commit is contained in:
Alexander Mahr 2024-10-09 20:29:40 +02:00
parent f6261aebcd
commit 61c53c1fe4
3 changed files with 29 additions and 57 deletions
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5
README.md
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@ -1,5 +1,10 @@
# Repo allowing -in a KISS way- to create a containered way to build an Android App APK
## changelog
* using https://android.googlesource.com/platform/cts/+/android-7.1.1_r13/tests/tests/webkit/src/android/webkit/cts/PostMessageTest.java derived
webmessage to send data to Javascript/Webview from Java (using a timer)
## brach `no-res.xml`
this branch features the exmaple.app to not require the compoletely bogus unneeded requirement

42
apk/src/app/example/ExampleApp.java
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@ -1,22 +1,27 @@
package app.example;
import android.util.Log;
import android.widget.TextView;
import android.util.Base64;
import android.app.Activity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.MenuItem;
import android.view.*;
import android.widget.*;
import android.webkit.WebView;
import android.webkit.*;
import android.view.ViewGroup.*;
import android.util.Base64;
import java.lang.Thread;
import android.os.CountDownTimer;
import android.text.method.ScrollingMovementMethod;
import android.view.*;
//import android.view.MenuItem;
import android.view.ViewGroup.*;
import android.widget.*;
//import android.widget.TextView;
import android.webkit.*;
import android.net.Uri;
//import android.webkit.WebView;
//import android.webkit.WebMessage;
//import android.webkit.WebMessagePort;
public class ExampleApp extends Activity {
private static final String BASE_URI = "https://alexmahr.de";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
@ -35,23 +40,24 @@ public class ExampleApp extends Activity {
myWebSettings.setJavaScriptEnabled(true);
myWebView.addJavascriptInterface(this, "myJavaScriptInterface");
// providing a webpage inline
String unencodedHtml = "<!DOCTYPE html><html><script> window.addEventListener('load',()=>{d=document.createElement('div');d.innerHTML=myJavaScriptInterface.toString()+'JAVASCRIPT works';document.body.appendChild(d);},false);</script><a href='https://html5test.co/'>https://html5test.co/</a><h1> this is html <h1> <h2> this is a h2</h2><img src='https://wald.alexmahr.de/images/rabe.avif'></html>";
String unencodedHtml = "<!DOCTYPE html><html><script> window.addEventListener('message',(e)=>{document.body.innerHTML='';u=document.createElement('div');u.innerHTML='message'+e.data;document.body.appendChild(u);},true);window.addEventListener('load',()=>{d=document.createElement('div');d.innerHTML=myJavaScriptInterface.toString()+'JAVASCRIPT works';document.body.appendChild(d);},false);</script><a href='https://html5test.co/'>https://html5test.co/</a><h1> this is html <h1> <h2> this is a h2</h2><img src='https://wald.alexmahr.de/images/rabe.avif'></html>";
String encodedHtml = Base64.encodeToString(unencodedHtml.getBytes(),Base64.NO_PADDING);
myWebView.loadDataWithBaseURL("https://alexmahr.de/",unencodedHtml, "text/html", "UTF-8",null);
myWebView.loadDataWithBaseURL(BASE_URI,unencodedHtml, "text/html", "UTF-8",null);
//myWebView.loadData(encodedHtml, "text/html", "base64");
// alternatively this could be to load a website
//myWebView.loadUrl("https://alexmahr.de/ru");
setContentView(myWebView);
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
public void onTick(long millisUntilFinished) {
myWebView.postWebMessage(new WebMessage("this is the message"+millisUntilFinished),Uri.parse(BASE_URI));
// mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
myWebView.evaluateJavascript("document.body.innerHTML='SUP "+millisUntilFinished+" all is lost';",null);
}
// myWebView.evaluateJavascript("document.body.innerHTML='SUP "+millisUntilFinished+" all is lost';",null);
}
public void onFinish() {
public void onFinish() {
myWebView.evaluateJavascript("document.body.innerHTML='all is lost';",null);
}
}.start();
}
}.start();
}
@JavascriptInterface
public String toString() {

39
apk/src/app/example/MyJavascriptInterface.java
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package app.example;
import android.util.Log;
import android.widget.TextView;
import android.app.Activity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.MenuItem;
import android.view.*;
import android.widget.*;
import android.webkit.WebView;
import android.webkit.*;
import android.view.ViewGroup.*;
import android.util.Base64;
import android.os.Environment;
import java.io.*;
//File all;
public class MyJavascriptInterface {
private Activity activity;
private WebView webview;
public MyJavascriptInterface(Activity activity,WebView webview) {
this.activity = activity;
this.webview = webview;;
}
// @JavascriptInterface
// public void startVideo(String videoAddress){
// Intent intent = new Intent(Intent.ACTION_VIEW);
// intent.setDataAndType(Uri.parse(videoAddress), "video/3gpp");
// activity.startActivity(intent);
// }
@JavascriptInterface
public String toString() {
// this.webview.evaluateJavascript("(setTimeout(()=>{document.body.innerHTML='all gone';},2000)()",null);
return "injectedobject";
}
}