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Introduction

How to use Context correctly in android.

How many contexts in an application

As following we understood, subclasses of Context are Activity, Service, Application, ...etc.

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Introduction

Introduce that we should use the way of occasions of lateinit and lazy simplely.

lateinit

1. Import external variable or method, that object is built from external constructor. The lifecycle of self doesn't relate with external object.

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Introduction

There are very good five stdlib operates we can use.

1. let
2. run
3. apply
4. also

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Introduction

Activity

Activity life cycle normally

onCreate ->
onStart ->

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Introduction

Add the user agent in your WKWebView.

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Introduction

Changing the default action before loading a url link.

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Introduction

We can obtain all of the HTTP header information from WKWebView.

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Introduction

When develope the web app in Android, you have to customize all of the function by yourself; otherwise, they don't work.

1. WebViewClient
2. WebChromeClient
3. DownloadListener

We should implement three classes for handling various actions you need.

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Introduction

1. Broadcast & Receiver
2. LocalBroadcast & LocalReceiver

Broadcast & Receiver

• Dynamic register: By through your java code.

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public class MyActivity extends Activity {
    public static final int INPUT_FILE_REQUEST_CODE = 5568;
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (RESULT_OK == resultCode) {
            switch (requestCode) {
                case INPUT_FILE_REQUEST_CODE: