MainActivity如下:
LogUtils如下:
TestLog如下:
main.xml如下:
package cc.cn.logutil;
import android.os.Bundle;
import android.app.Activity;
/**
* Demo描述:
* 对于Android系统Log输出日志的封装LogUtils
* 1 可修改LogUtils中的LEVEL值觉得哪些级别的日志可以输出.
* 所以方便选择性输出日志或者屏蔽日志输出
* 2 输出的日志除了本想输出的信息外还包含了该日志输出时所属
* 的线程,类,方法名,已经在该方法中的行数等实用信息
* 3 LogUtils的调用方式
* 3.1 按照系统原方式调用
* 3.2 或者不设置TAG,则默认为文件名
*
* 备注说明:
* 在该示例中主要用到了StackTrace和StackTraceElement.
* 详情可参见上篇博客《StackTrace简述以及StackTraceElement使用实例》
*
*/
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LogUtils.i("MainActivity", "onCreate1");
LogUtils.i(null, "onCreate2");
LogUtils.i("", "onCreate3");
LogUtils.i("onCreate4");
test();
}
private void test() {
LogUtils.i("调用了MainActivity中的test()");
TestLog.testLog();
new Thread() {
public void run() {
LogUtils.i("调用了子线程");
};
}.start();
}
@Override
protected void onStart() {
super.onStart();
LogUtils.i("onStart");
}
@Override
protected void onResume() {
super.onResume();
LogUtils.i("onResume");
}
@Override
protected void onPause() {
super.onPause();
LogUtils.i("onPause");
}
@Override
protected void onStop() {
super.onStop();
LogUtils.i("onStop");
}
@Override
protected void onDestroy() {
super.onDestroy();
LogUtils.i("onDestroy");
}
}
LogUtils如下:
package cc.cn.logutil;
import android.text.TextUtils;
import android.util.Log;
/**
* LogUtils工具说明:
* 1 只输出等级大于等于LEVEL的日志
* 所以在开发和产品发布后通过修改LEVEL来选择性输出日志.
* 当LEVEL=NOTHING则屏蔽了所有的日志.
* 2 v,d,i,w,e均对应两个方法.
* 若不设置TAG或者TAG为空则为设置默认TAG
*
*/
public class LogUtils {
public static final int VERBOSE = 1;
public static final int DEBUG = 2;
public static final int INFO = 3;
public static final int WARN = 4;
public static final int ERROR = 5;
public static final int NOTHING = 6;
public static final int LEVEL = VERBOSE;
public static final String SEPARATOR = ",";
public static void v(String message) {
if (LEVEL <= VERBOSE) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
String tag = getDefaultTag(stackTraceElement);
Log.v(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void v(String tag, String message) {
if (LEVEL <= VERBOSE) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
if (TextUtils.isEmpty(tag)) {
tag = getDefaultTag(stackTraceElement);
}
Log.v(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void d(String message) {
if (LEVEL <= DEBUG) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
String tag = getDefaultTag(stackTraceElement);
Log.d(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void d(String tag, String message) {
if (LEVEL <= DEBUG) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
if (TextUtils.isEmpty(tag)) {
tag = getDefaultTag(stackTraceElement);
}
Log.d(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void i(String message) {
if (LEVEL <= INFO) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
String tag = getDefaultTag(stackTraceElement);
Log.i(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void i(String tag, String message) {
if (LEVEL <= INFO) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
if (TextUtils.isEmpty(tag)) {
tag = getDefaultTag(stackTraceElement);
}
Log.i(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void w(String message) {
if (LEVEL <= WARN) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
String tag = getDefaultTag(stackTraceElement);
Log.w(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void w(String tag, String message) {
if (LEVEL <= WARN) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
if (TextUtils.isEmpty(tag)) {
tag = getDefaultTag(stackTraceElement);
}
Log.w(tag, getLogInfo(stackTraceElement) + message);
}
}
public static void e(String tag, String message) {
if (LEVEL <= ERROR) {
StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
if (TextUtils.isEmpty(tag)) {
tag = getDefaultTag(stackTraceElement);
}
Log.e(tag, getLogInfo(stackTraceElement) + message);
}
}
/**
* 获取默认的TAG名称.
* 比如在MainActivity.java中调用了日志输出.
* 则TAG为MainActivity
*/
public static String getDefaultTag(StackTraceElement stackTraceElement) {
String fileName = stackTraceElement.getFileName();
String stringArray[] = fileName.split("\\.");
String tag = stringArray[0];
return tag;
}
/**
* 输出日志所包含的信息
*/
public static String getLogInfo(StackTraceElement stackTraceElement) {
StringBuilder logInfoStringBuilder = new StringBuilder();
// 获取线程名
String threadName = Thread.currentThread().getName();
// 获取线程ID
long threadID = Thread.currentThread().getId();
// 获取文件名.即xxx.java
String fileName = stackTraceElement.getFileName();
// 获取类名.即包名+类名
String className = stackTraceElement.getClassName();
// 获取方法名称
String methodName = stackTraceElement.getMethodName();
// 获取生日输出行数
int lineNumber = stackTraceElement.getLineNumber();
logInfoStringBuilder.append("[ ");
logInfoStringBuilder.append("threadID=" + threadID).append(SEPARATOR);
logInfoStringBuilder.append("threadName=" + threadName).append(SEPARATOR);
logInfoStringBuilder.append("fileName=" + fileName).append(SEPARATOR);
logInfoStringBuilder.append("className=" + className).append(SEPARATOR);
logInfoStringBuilder.append("methodName=" + methodName).append(SEPARATOR);
logInfoStringBuilder.append("lineNumber=" + lineNumber);
logInfoStringBuilder.append(" ] ");
return logInfoStringBuilder.toString();
}
}
TestLog如下:
package cc.cn.logutil;
public class TestLog {
public static void testLog(){
LogUtils.i("调用了TestLog中的testLog()");
}
}
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="对于Android系统Log输出日志的封装LogUtils"
android:layout_centerInParent="true"/>
</RelativeLayout>
