Android 8.0

① notification bar adapter

Figure I

② subscript function

The good news is, starting with the 8.0 system, Google has developed a subscript specification on the Android system, but also provides a standard API, allows developers to long-term headache for this problem can now finally been resolved.

So here we come to learn about how to implement the subject of unread angle effect on the Android system. Modify the code of MainActivity, as it follows:

public classMainActivityextendsAppCompatActivity{

...

@TargetApi(Build.VERSION_CODES.O)

privatevoidcreateNotificationChannel(String channelId, String channelName,intimportance){

NotificationChannel channel = new NotificationChannel(channelId, channelName, importance);

channel.setShowBadge(true);

NotificationManager notificationManager = (NotificationManager) getSystemService(

NOTIFICATION_SERVICE);

notificationManager.createNotificationChannel(channel);

}

publicvoidsendSubscribeMsg(View view){

NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

Notification notification = new NotificationCompat.Builder(this, "subscribe")

...

.setNumber (2)

.build();

manager.notify(2, notification);

}

We can see, here we modified the two places. The first is when you create a notification channel, called NotificationChannel of setShowBadge (true) method, a notice under this representation allows the display channels subscript. The second is when creating the notification, called setNumber () method, passing in the number of unread messages.

Now re-run the program and click the button to send a subscription message, and then find NotificationTest this application in the Launcher, as shown below:

Figure II

③ excerpt from http://mp.weixin.qq.com/s/Ez-G_9hzUCOjU8rRnsW8SA

Android 7.0

The new error occurred while calling camera Android7.0:

android.os.FileUriExposedException: file:///storage/emulated/0/photo.jpeg exposed beyond app through ClipData.Item.getUri()

Solution:

() Method to add the following code in the Application onCreat:

// android 7.0 system to solve the problem of camera

StrictMode.VmPolicy.Builder builder =newStrictMode.VmPolicy.Builder();

StrictMode.setVmPolicy(builder.build());

builder.detectFileUriExposure();

Android 4.4 (API19）

1. immersive status bar
2.WebView webview debugging features

 WebView.setWebContentsDebuggingEnabled(true);

WebView increase ignore all certificate requests to https https certificate restrictions need to verify or set

Android 5.0 (API 21)

Http and Https on WebView in mixing problems 1.Android5.0

/**
 * MIXED_CONTENT_ALWAYS_ALLOW：允许从任何来源加载内容，即使起源是不安全的；
 * MIXED_CONTENT_NEVER_ALLOW：不允许Https加载Http的内容，即不允许从安全的起源去加载一个不安全的资源；
 * MIXED_CONTENT_COMPATIBILITY_MODE：当涉及到混合式内容时，WebView 会尝试去兼容最新Web浏览器的风格。
 **/
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { webView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW); }

WebView cookie storage problems

   public static void syncCookie(String url, String key) { CookieManager cookieManager = CookieManager.getInstance(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { cookieManager.removeSessionCookies(null); cookieManager.flush(); } else { cookieManager.removeSessionCookie(); CookieSyncManager.getInstance().sync(); } cookieManager.setAcceptCookie(true); cookieManager.setCookie(url, key); }