Die Anleitung zu Android WebView

Was ist Android WebView?
Das Beispeil mit Android WebView
Anhang: Die Interface entwerfen

1. Was ist Android WebView?

TODO: More Info

2. Das Beispeil mit Android WebView

Zunächst werden wir ein einfaches Beispiel üben. In diesem Beispiel wird WebView eine statische Inhalt und eine Inhalt aus URL anzeigen.

EErrstellen Sie ein Projekt mit dem Name von AndroidWebView:

File > New > New Project > Empty Activity
- Name: AndroidWebView
- Package name: org.o7planning.androidwebview
- Language: Java

Ihre Applikation wird mit dem Internet verbinden. Deshalb sollen Sie das Erlaubnis zur Internetverbindung in AndroidManifest.xml konfigurieren. Ergänzen Sie:

<uses-permission android:name="android.permission.INTERNET" />

Die volle Inhalt von AndroidManifest.xml ist

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.androidwebview">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Das Interface der Applikation

Wenn Sie an den Schritten zum Entwerfen der Interface dieser Anwendung interessiert sind, lesen Sie bitte den Anhang am Ende des Artikels..

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">

    <EditText
        android:id="@+id/editText_addressBar"
        android:layout_width="375dp"
        android:layout_height="48dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="25dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_addressBar">

        <Space
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <Button
            android:id="@+id/button_static"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Static Content" />

        <Button
            android:id="@+id/button_go"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Go" />
    </LinearLayout>

    <WebView
        android:id="@+id/webView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout" />
</androidx.constraintlayout.widget.ConstraintLayout>

MyWebViewClient.java

package org.o7planning.androidwebview;

import android.graphics.Bitmap;
import android.util.Log;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;


public class MyWebViewClient extends WebViewClient {

    private EditText addressBar;

    public MyWebViewClient(EditText addressBar) {
        this.addressBar= addressBar;
    }

    // When you click on any interlink on webview.
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        Log.i("MyLog","Click on any interlink on webview that time you got url :-" + url);
        addressBar.setText(url);
        return super.shouldOverrideUrlLoading(view, url);
    }

    // When page loading
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
        Log.i("MyLog", "Your current url when webpage loading.." + url);
    }

    // When page load finish.
    @Override
    public void onPageFinished(WebView view, String url) {
        Log.i("MyLog", "Your current url when webpage loading.. finish" + url);
        super.onPageFinished(view, url);
    }

    @Override
    public void onLoadResource(WebView view, String url) {
        super.onLoadResource(view, url);
    }

}

MainActivity.java

package org.o7planning.androidwebview;

import android.app.Activity;
import android.os.Bundle;

import android.view.View;

import android.webkit.WebView;

import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity  {


   private  EditText addressBar;

   private WebView webView;
   private Button buttonGo;
   private Button buttonStatic;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       buttonGo =(Button)findViewById(R.id.button_go);
       buttonStatic =(Button)findViewById(R.id.button_static);

       addressBar =(EditText)findViewById(R.id.editText_addressBar);
       webView =(WebView)findViewById(R.id.webView);

 
       // Tùy biến WebViewClient để điều khiển các sự kiện trên WebView
       webView.setWebViewClient(new MyWebViewClient(addressBar));

       buttonGo.setOnClickListener(new Button.OnClickListener() {
           @Override
           public void onClick(View view) {
               goUrl();
           }
       });

       buttonStatic.setOnClickListener(new Button.OnClickListener() {
           @Override
           public void onClick(View view) {
               showStaticContent();
           }
       });
   }

   private void goUrl()  {
       String url = addressBar.getText().toString().trim();
       if(url.isEmpty())  {
           Toast.makeText(this,"Please enter url",Toast.LENGTH_SHORT).show();
           return;
       }
       webView.getSettings().setLoadsImagesAutomatically(true);
       webView.getSettings().setJavaScriptEnabled(true);
       webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
       webView.loadUrl(url);
   }


   private void showStaticContent()  {
       String staticContent="<h2>Select web page</h2>"
               + "<ul><li><a href='http://eclipse.org'>Eclipse</a></li>"
               +"<li><a href='http://google.com'>Google</a></li></ul>";
       webView.loadData(staticContent, "text/html", "UTF-8");
   }

}

3. Anhang: Die Interface entwerfen

Fügen Sie EditText und Button in die Interface ein.

Fügen Sie WebView in die Interface.

Legen Sie ID, Text für die Komponenten in die Interface fest.

Anleitungen Android

Anleitungen Flutter

Die Anleitung zu Android WebView

1. Was ist Android WebView?

2. Das Beispeil mit Android WebView

3. Anhang: Die Interface entwerfen

Anleitungen Android

Anleitungen Android

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