日常開發的時候，adb埠經常被一些其他程式佔用，譬如一些手機助手軟體會頻繁的導致5037埠不可用，其實我們可以自定義adb的埠，而且一勞永逸，不用在頻繁的 adb kill-server的命令 或者查詢佔用埠的程式去殺掉，這也太麻煩。
- win系統配置ANDROID_ADB_SERVER_PORT
在系統環境變數中定義 ANDROID_ADB_SERVER_PORT 的值即可，這樣adb在執行的時候回使用我們配置的ANDROID_ADB_SERVER_PORT值，而不是原來預設的5037這個埠，
- 配置ANDROID_ADB_SERVER_PORT作用
大家好奇為啥通過配置ANDROID_ADB_SERVER_PORT就可以修改adb的埠,看看adb的原始碼
private static final String SERVER_PORT_ENV_VAR = "ANDROID_ADB_SERVER_PORT"; //$NON-NLS-1$
// Where to find the ADB bridge.
static final String DEFAULT_ADB_HOST = "127.0.0.1"; //$NON-NLS-1$
static final int DEFAULT_ADB_PORT = 5037;//預設埠
/**
* Returns the port where adb server should be launched. This looks at:
* <ol>
* <li>The system property ANDROID_ADB_SERVER_PORT</li>
* <li>The environment variable ANDROID_ADB_SERVER_PORT</li>
* <li>Defaults to {@link #DEFAULT_ADB_PORT} if neither the system property nor the env var
* are set.</li>
* </ol>
*
* @return The port number where the host's adb should be expected or started.
*/
private static int getAdbServerPort() {
// check system property
Integer prop = Integer.getInteger(SERVER_PORT_ENV_VAR);
if (prop != null) {
try {
return validateAdbServerPort(prop.toString());
} catch (IllegalArgumentException e) {
String msg = String.format(
"Invalid value (%1$s) for ANDROID_ADB_SERVER_PORT system property.",
prop);
Log.w(DDMS, msg);
}
}
// when system property is not set or is invalid, parse environment property
try {
String env = System.getenv(SERVER_PORT_ENV_VAR);
if (env != null) {
return validateAdbServerPort(env);
}
} catch (SecurityException ex) {
// A security manager has been installed that doesn't allow access to env vars.
// So an environment variable might have been set, but we can't tell.
// Let's log a warning and continue with ADB's default port.
// The issue is that adb would be started (by the forked process having access
// to the env vars) on the desired port, but within this process, we can't figure out
// what that port is. However, a security manager not granting access to env vars
// but allowing to fork is a rare and interesting configuration, so the right
// thing seems to be to continue using the default port, as forking is likely to
// fail later on in the scenario of the security manager.
Log.w(DDMS,
"No access to env variables allowed by current security manager. "
+ "If you've set ANDROID_ADB_SERVER_PORT: it's being ignored.");
} catch (IllegalArgumentException e) {
String msg = String.format(
"Invalid value (%1$s) for ANDROID_ADB_SERVER_PORT environment variable (%2$s).",
prop, e.getMessage());
Log.w(DDMS, msg);
}
// use default port if neither are set
return DEFAULT_ADB_PORT;
}
複製程式碼上面的只是擷取了主要獲取埠號的方法getAdbServerPort（），該方法首先獲取作業系統屬性ANDROID_ADB_SERVER_PORT配置的值，如果找到就返回，否則才會返回預設的值DEFAULT_ADB_PORT，也是5037這個埠，所有我們通過配置ANDROID_ADB_SERVER_PORT是可以修改adb埠的目的
如果配置完ANDROID_ADB_SERVER_PORT該屬性，檢測不到裝置的話，重啟一下電腦就好