今天做了保存log到本地功能，防止App出现bug后不能及时查看log日志
首先封装了一个LogUtil类，以下是部分代码
自定义的前缀以及路径
// 自定义Tag的前缀
public static String customTagPrefix = "lxx";
// 是否把保存日志到SD卡中
private static final boolean isSaveLog = true;
// SD卡中的根目录
public static final String ROOT = Environment.getExternalStorageDirectory().getPath() + "/lxx/";
private static final String PATH_LOG_INFO = ROOT + "info/";
自定义的logger
/**
* 自定义的logger
*/
public static CustomLogger customLogger;
public interface CustomLogger {
void e(String tag, String content)
}
public static void e(String content) {
StackTraceElement caller = getCallerStackTraceElement();
String tag = generateTag(caller);
if (customLogger != null) {
customLogger.e(tag, content);
} else {
Log.e(tag, content);
}
// isSaveLog是否把保存日志到SD卡中
if (isSaveLog) {
point(PATH_LOG_INFO, tag, content);
}
}
point方法，对文件夹以及文件的创建，写入做了对应的操作
public static void point(String path, String tag, String msg) {
if (isSDAva()) {
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("",
Locale.SIMPLIFIED_CHINESE);
dateFormat.applyPattern("yyyy");
path = path + dateFormat.format(date) + "/";
dateFormat.applyPattern("MM");
path += dateFormat.format(date) + "/";
dateFormat.applyPattern("dd");
path += dateFormat.format(date) + ".log";
dateFormat.applyPattern("[yyyy-MM-dd HH:mm:ss]");
String time = dateFormat.format(date);
File file = new File(path);
if (!file.exists())
createDipPath(path);
BufferedWriter out = null;
try {
out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file, true)));
out.write(time + " " + tag + " " + msg + "\r\n");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
createDipPath方法，根据文件路径，递归创建文件
public static void createDipPath(String file) {
String parentFile = file.substring(0, file.lastIndexOf("/"));
File file1 = new File(file);
File parent = new File(parentFile);
if (!file1.exists()) {
parent.mkdirs();
try {
file1.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
主要用到的就是以上代码
调用时直接调用LogUtils.e("需要保存的内容")即可保存到本地,比如：
LogUtils.e("\n"+"登录时传的值-----------------"+
"登陆类型："+loginType+"\n"+
"\n"+"用户名："+userName+
"\n"+"密码"+pwd
+"\n"+"身份"+getidentity());
安卓7.0对权限的访问是有问题的，所以需要动态申请权限，为了测试方便，只简单写了一下代码
public class MainActivity extends AppCompatActivity {
// 要申请的权限
private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 检查该权限是否已经获取
int i = ContextCompat.checkSelfPermission(this, permissions[0]);
// 权限是否已经 授权 GRANTED---授权 DINIED---拒绝
if (i == PackageManager.PERMISSION_GRANTED) {
// 如果没有授予该权限，就去提示用户请求
// showDialogTipUserRequestPermission();
ActivityCompat.requestPermissions(this, permissions, 321);
}
}
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 321) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
LogUtils.e("kkkkj");
}
}
}
