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);
}
}