按钮单击以在所需活动中进行网络查看

Question

I'm in progress on developing an android application and I'm looking for how to implement the following cases.

1. How to open a web view in second activity by clicking a button in the main activity?
2. And, How to navigate back to the main activity when the back button is pressed.
   3. I have 12 buttons in the main activity each opens a web view in the second activity. For example button 1 is for google.then by clicking button 1 one can view web view of google in the second activity.Like this button 2 is for Face Book.Then by clicking button 2 one can view web view of Face Book in the second activity.How to Implement this scenario for 12 buttons in the main activity.

Answer 1

Add the following code in your secondActivity.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <WebView
        android:id="@+id/webView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

Add following code in onCreate() of your secondActivity.java

Webview webView = (WebView) findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("https://www.google.com");

Take a button in your firstActivity.xml

<Button
        android:text="Open"
        android:id="@+id/btnOpen"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

Redirect to secondActivity

btnOpen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    startActivity(new Intent(getApplicationContext(),SecondActivity.class));
                    finish();

            }
        });

Add this in your onBackPressed

@Override
    public void onBackPressed() {
        startActivity(new Intent(getApplicationContext(),FirstActivity.class));
        finish();
    }