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通过注册广播的方式监听USB设备 。广播Action UsbManager.ACTION_USB_DEVICE_ATTACHEDUsb设备插入或者挂载事件通知 UsbManager.ACTION_USB_DEVICE_DETACHEDUsb设备拔出或者卸载时间通知定义广播private final BroadcastReceiver mUsbMonitorReceiver = new BroadcastReceiver() { @Override publi

public static String keyCodeToChar(int code, boolean isShift) { switch (code) { case KeyEvent.KEYCODE_SHIFT_LEFT: case KeyEvent.KEYCODE_SHIFT_RIGHT: case KeyEvent.KEYCODE_SPACE: case KeyEvent.KEYCODE_

通过添加拦截器的方式，打印通信日志。添加依赖库implementation "com.squareup.okhttp3:logging-interceptor:+"创建日志拦截器private HttpLoggingInterceptor createHttpLogInterceptor() { HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor( ne

以alibaba fastjson为例，通过JSONField注解标签定义JSON字符串字段的名称。定义JAVA对象：import com.alibaba.fastjson.annotation.JSONField;public class TestBean { @JSONField(name = "1") private String name; @JSONField(name = "2") private String sex; public TestB

1、设置网络状态访问权限<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />2、判断是否有网络连接ConnectivityManager cm = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo info = cm

public static void setSystemUIVisible(Activity activity, boolean visible) { if (visible) { int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE; uiFlags |= 0x00001000; activity.getWindow().getDecorView().setSystemUiV

如题public static String randomMacAddress() { StringBuilder sb = new StringBuilder(); for (int i = 0; i < 6; i++) { if (sb.length() > 0) { sb.append(":"); } Random random = new Rando

sw:smallest width,屏幕的最小宽度。获取方法：getResources().getConfiguration().smallestScreenWidthDp文章原创，图片来源于网络，如有侵权，请联系删除

Android INSTALL_FAILED_TEST_ONLY的解决方法1、adb install -t apk-path2、配置gradle.properties，新增如下参数android.injected.testOnly=false3、编译成 release版本文章原创，图片来源于网络，如有侵权，请联系删除...

Android 使用POI导出Excel表格1、导入poi依赖库最新版本的poi下载地址：http://poi.apache.org/download.html2、配置gradlepackagingOptions { exclude 'META-INF/DEPENDENCIES' exclude 'META-INF/NOTICE' exclude 'META-INF/NOTICE.txt' exclude 'META-INF/LIC

Android 使用retrofit方式请求https信任手机所有CA证书请求示例代码片段如下所示：` /** * 自定义SSLSocket, 忽略验证客户端和服务端证书。 * @return * @throws Exception */private static SSLSocketFactory getSSLSocketFactory() throws Exception { final TrustManager[] trustAllCerts = new TrustManage