使用手机后退按钮退出Webview [英] using phones back button to exit from webview

问题描述

电话后退按钮可以在Web视图中使用，但是当我想从Web视图退出到应用程序时，它什么也没做. 我放了一个可以返回到应用程序的按钮，但我没有那样保留.

The phone back button works in the webview,but when I want to exit from the Webview to the application this didn't do anything. I put a button that go back to the application but I did't that remain that way.

JAVA:

package com.wiralss.adb;

 import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
 import android.view.Window;
 import android.webkit.WebChromeClient;
 import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
 public class about extends Activity implements OnClickListener{
 WebView webView;

  final Activity activity = this;

@Override
public void onCreate(Bundle savedInstanceState)
{


super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.instagrem);
webView = (WebView) findViewById(R.id.webView1);
Button B123=(Button)findViewById(R.id.button1235);
B123.setOnClickListener(this);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("https://www.google.com");

webView.setWebChromeClient(new WebChromeClient() {
    public void onProgressChanged(WebView view, int progress)
    {
        activity.setTitle("Loading...");
        activity.setProgress(progress * 100);

        if(progress == 100)
            activity.setTitle(R.string.app_name);

    }
});


webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onReceivedError(WebView view, int errorCode, String description,    String failingUrl)
    {
        // Handle the error

    }


    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url)
    {
        view.loadUrl(url);
        return true;
    }
});

  }



@Override
public void onClick(View v) {
    switch(v.getId()){

    case R.id.button1235:
        Intent B = new Intent(this, MainActivity.class);
    startActivity(B);
    break;

    // TODO Auto-generated method stub

}

    // TODO Auto-generated method stub

}
public void onBackPressed (){

    if (webView.isFocused() && webView.canGoBack()) {
            webView.goBack();       
    }
    else {
            super.onBackPressed();
            finish();
    }
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        webView.goBack();


        return true;
    }
    return false;
}
}

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <WebView
        android:id="@+id/webView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
         />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button1235"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="580px"
            android:layout_weight="0.05"
            android:text="Button" />

    </LinearLayout>

</RelativeLayout>

另一个问题. 要删除按钮，我需要删除吗?:

Another question. To remove the button I need to delete?:

Button B123=(Button)findViewById(R.id.button1);
B123.setOnClickListener(this);

然后?

@Override
public void onClick(View v) {
    switch(v.getId()){

    case R.id.button1:
        Intent B = new Intent(this, MainActivity.class);
    startActivity(B);
    break;

    // TODO Auto-generated method stub

}

    // TODO Auto-generated method stub

}

非常感谢你

推荐答案

您无需调用super.onBackPressed()，因为您可以自己控制活动的完成.

You don't need the call to super.onBackPressed() as you are controlling the finishing of your activity yourself.

同样，您实际上不需要webView.isFocused()方法调用.

Equally, you don't really need the webView.isFocused() method call.

您可以重写您的onBackPressed方法，使其看起来像这样:

You can rewrite your onBackPressed method to read like this:

public void onBackPressed() {
    if (webView.canGoBack()) {
        webView.goBack();       
    }  else {
        finish();
    }
}

对于包含button1235按钮的动机，我不太确定，是您要删除的内容吗?

I'm not too sure on your motives for including your button1235 Button, is that something you are wanting to remove?

这篇关于使用手机后退按钮退出Webview的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！