AboutDialog の追加

AboutDialog の追加

    public class AboutDialog extends AlertDialog {
        private Context context;

        public AboutDialog(Context context) {
            super(context);
            this.context = context;
        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            LinearLayout li = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.about_layout, null);
            TextView textView = li.findViewById(R.id.textView3);
            textView.setText(Html.fromHtml("<u>" + getString(R.string.GooglePlayStore) + "<u>"));
            Pattern pattern = Pattern.compile("");
            String url = getString(R.string.PlayURL);
            Linkify.addLinks(textView, pattern, url, null, null);
            setContentView(li);
        }
    }



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="20dp"
    android:paddingTop="10dp"
    android:paddingRight="20dp"
    android:paddingBottom="30dp">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        app:srcCompat="@mipmap/ic_launcher_foreground" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/app_name"
        android:textSize="30dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/kankanla"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/GooglePlayStore"
        android:textSize="20dp" />
</LinearLayout>

Ads SDK

    ******************************************************************************
    * The Google Mobile Ads SDK was initialized incorrectly. AdMob publishers    *
    * should follow the instructions here: https://goo.gl/fQ2neu to add a valid  *
    * App ID inside the AndroidManifest. Google Ad Manager publishers should     *
    * follow instructions here: https://goo.gl/h17b6x.                           *
    ******************************************************************************

3.5 毫米耳机：配件规范

3.5 毫米耳机：配件规范



https://source.android.com/devices/accessories/headset/plug-headset-spec

直接启动

直接启动

<action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />

https://developer.android.com/training/articles/direct-boot?hl=zh-cn

アルファベットArrayList作成

import java.util.*;

class chart {
public static void main(String[] args) {
ArrayList<String> keyList = new ArrayList<>();
for (int i = 0x41; i < 0x5B; i++) {
keyList.add(String.valueOf((char)i));
}

for (int i = 0x30; i < 0x3A; i++) {
keyList.add(String.valueOf((char)i));
}

System.out.println(keyList);


String x = keyList.toString();
char[] temp = x.toCharArray();
temp = x.toCharArray();
for (char cc : temp) {
System.out.println(cc);
}

StringBuffer temp2 = new StringBuffer();

for(String xx :keyList){
temp2.append(xx);
}

System.out.println(temp2);
}
}

【Android】快速切换到主线程更新UI的几种方法

【Android】快速切换到主线程更新UI的几种方法
方法一： view.post(Runnable action)
textView.post(new Runnable() {
        @Override
        public void run() {
            textView.setText("更新textView");
            //还可以更新其他的控件
            imageView.setBackgroundResource(R.drawable.update);
        }
    });

方法二： activity.runOnUiThread(Runnable action)
public void updateUI(final Context context) {
        ((MainActivity) context).runOnUiThread(new Runnable() {
            @Override
            public void run() {
                //此时已在主线程中，可以更新UI了
            }
        });
    }

方法三： Handler机制
...

java_Semaphore

java_Semaphore

import java.util.concurrent.Semaphore;
import java.lang.System;

class  M180717_Semaphore {
public static void main(String[] args) {
Semaphore semaphore = new Semaphore(8);
long s = System.currentTimeMillis();

A a = new A(semaphore);
a.start();

B b = new B(semaphore);
b.start();

B b2 = new B(semaphore);
b2.start();
}
}

class A extends Thread {
private Semaphore semaphore;
public A(Semaphore semaphore) {
this.semaphore = semaphore;
}

@Override
public void run() {
try {
semaphore.acquire();
System.out.println(Thread.currentThread().getName() + "-------");
for (int i = 0 ; i < 99 ; i++) {
System.out.print("a");
}
semaphore.release();
} catch (Exception e) {
System.out.println(semaphore.getQueueLength());
}
}
}

class B extends Thread {
private Semaphore semaphore;

public B(Semaphore semaphore) {
this.semaphore = semaphore;
}

@Override
public void run() {
try {
// System.out.println(semaphore.getQueueLength());
semaphore.acquire();
System.out.println(Thread.currentThread().getName() + "-------");
for (int i = 0 ; i < 99 ; i++) {
System.out.print("b");
}
semaphore.release();
} catch (Exception e) {
System.out.println(semaphore.getQueueLength());
}
}
}

class C extends Thread {
@Override
public void run() {
System.out.println(Thread.currentThread().getName() + "-------");
for (int i = 0 ; i < 99 ; i++) {
System.out.print("c");
}
}
}

class X implements Runnable {
@Override
public void run() {
System.out.println("xxxxx");
}
}