Category：Android
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Time：2020-9-26
This example for you to share Android QQ group to achieve two-level menu display specific code, for your reference, the specific content is as follows First show the effect to be achieved For dynamic view, please see the link 1. First, define the item, that is, the item of secondary display child_item.xml <?xml version=”1.0″ encoding=”utf-8″?> […]
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Time：2020-9-25
catalog Usage analysis├ – 1. JNI function │ ├── 1.1、extern “C” │ ├── 1.2、JNIEXPORT、JNICALL3. Function name │ ├── 1.4、JNIEnv │ ├── 1.5、jobject𗍊 – 2. Mapping relations of Java, JNI and C / C + + basic types├ – 3. JNI descriptor (signature)Function static registration and dynamic registration1. Principle of dynamic registration2. Principle of static registration3. […]
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Time：2020-9-25
In this paper, we share the specific code of Android to remember the password function for your reference. The specific content is as follows LoginActivity.java package com.wangdeqiang.www.chatwithrobot.BroadcastBestPractice; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.Toast; import com.wangdeqiang.www.chatwithrobot.R; import static com.wangdeqiang.www.chatwithrobot.R.id.account; /** * @author */ public […]
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Time：2020-9-24
First, let’s look at the picture above XML code is as follows, used to write buttons: The Java code is as follows to implement the logic: import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity{ int index; String [] item = {“Android”,”IOS”,”Spark”,”Hadoop”,”Web”}; […]
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Time：2020-9-24
The first project that I came into contact with when I graduated from school was mobile nurse station. The first task I received was to log in and use the automatic login function. So I made a record here. When I used it in the future, I would paste and copy it directly. Let’s talk […]
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Time：2020-9-23
Qt for Android Qt for Android enables you to run Qt 5 applications Android devices. All Qt modules (essential and add-on) are supported except Qt WebEngine, Qt Serial Port, and the platform-specific ones (Qt Mac Extras, Qt Windows Extras, and Qt X11 Extras). On windows or Linux platform, qtwebengine module can be used to […]
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Time：2020-9-23
Usage Extension function is another killer function of kotlin. It can extend the ability of some classes without modifying the source code, which is convenient for development. For example, this shows how to add a method to a string to get the first element. fun String.first(): Char { if (isEmpty()) { throw NoSuchElementException(“String is empty”) […]
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Time：2020-9-22
Step 1: Win + R output CMD, enter the command line, find the JDK installation path, and enter the bin folder Step 2: input keytool.exe -List – keystore plus. Android folder debug.keystore File path Step 3: input the password. In general, if there is no password, press enter directly The last CV […]
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Time：2020-9-22
preface Recently, we need to integrate the three-party login and sharing of Youmeng in the project. We haven’t recorded it before, so let’s write about it this time preparation 1. Register the Youmeng account to create an application and obtain key: application address http://www.umeng.com 2. Apply for a third-party account for the corresponding platforms (Tencent, […]
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Time：2020-9-21
private boolean isForeground() { ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); List processes = activityManager.getRunningAppProcesses(); if (processes == null || processes.isEmpty()) { return false; } for (ActivityManager.RunningAppProcessInfo info : processes) { if (info.processName.equals(getPackageName()) && info.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) { return true; } } return false; }
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Time：2020-9-21
Last time I wrote about Android connecting to anonymous WiFi. WiFi development for application layer development is a relatively small knowledge point, but since it is used, it will be recorded here. Creating hotspots 1. Create hotspots according to encryption type, password, hidden or not static WifiConfiguration createWifiConfig(String SSID, @WifiSecurityType int wifiCipherType, String password, boolean […]
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Time：2020-9-20
background We know that if you switch between pages directly, it will be hard, and it will make users feel very abrupt, and the user experience is not very good. Therefore, in general, in order to achieve smooth transition between pages, animation will be added. In addition, sometimes we don’t like the default animation of […]
