获取当前线程状态--Thread类

String msgToPrint = Thread.currentThread().getStackTrace()[3] .getMethodName();

 就是调用时的方法名。

其中使用的Thread类的第一个方法：

public static Thread currentThread()

返回当前线程对象。

实例代码:

package com.loaderman.getthreadstatusdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        printStackInfos();
    }
    private void printStackInfos() {
        StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();

        System.out.println("Called in printStackInfos() method!!!!!!!");
        System.out.println("The stackTraceElements length: " + stackTraceElements.length);
        
        for (int i = 0; i < stackTraceElements.length; ++i) {
            System.out.println("----  the " + i + " element  ----");
            System.out.println("toString: " + stackTraceElements[i].toString());
            System.out.println("ClassName: " + stackTraceElements[i].getClassName());
            System.out.println("FileName: " + stackTraceElements[i].getFileName());
            System.out.println("LineNumber: " + stackTraceElements[i].getLineNumber());
            System.out.println("MethodName: " + stackTraceElements[i].getMethodName());
        }
    }
}

 日志输出

03-17 04:48:10.088 701-701/com.loaderman.getthreadstatusdemo I/System.out: Called in printStackInfos() method!!!!!!!
03-17 04:48:10.098 701-701/com.loaderman.getthreadstatusdemo I/System.out: The stackTraceElements length: 18
03-17 04:48:10.108 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 0 element  ----
03-17 04:48:10.108 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: dalvik.system.VMStack.getThreadStackTrace(Native Method)
03-17 04:48:10.108 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: dalvik.system.VMStack
03-17 04:48:10.108 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: VMStack.java
03-17 04:48:10.118 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: -2
03-17 04:48:10.118 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: getThreadStackTrace
03-17 04:48:10.118 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 1 element  ----
03-17 04:48:10.138 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: java.lang.Thread.getStackTrace(Thread.java:591)
03-17 04:48:10.138 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: java.lang.Thread
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Thread.java
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 591
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: getStackTrace
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 2 element  ----
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: com.loaderman.getthreadstatusdemo.MainActivity.printStackInfos(MainActivity.java:16)
03-17 04:48:10.148 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: com.loaderman.getthreadstatusdemo.MainActivity
03-17 04:48:10.158 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: MainActivity.java
03-17 04:48:10.158 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 16
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: printStackInfos
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 3 element  ----
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: com.loaderman.getthreadstatusdemo.MainActivity.onCreate(MainActivity.java:12)
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: com.loaderman.getthreadstatusdemo.MainActivity
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: MainActivity.java
03-17 04:48:10.168 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 12
03-17 04:48:10.179 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: onCreate
03-17 04:48:10.179 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 4 element  ----
03-17 04:48:10.179 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.Activity.performCreate(Activity.java:5008)
03-17 04:48:10.188 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.Activity
03-17 04:48:10.188 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Activity.java
03-17 04:48:10.198 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 5008
03-17 04:48:10.198 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: performCreate
03-17 04:48:10.198 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 5 element  ----
03-17 04:48:10.208 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
03-17 04:48:10.208 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.Instrumentation
03-17 04:48:10.208 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Instrumentation.java
03-17 04:48:10.208 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 1079
03-17 04:48:10.218 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: callActivityOnCreate
03-17 04:48:10.218 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 6 element  ----
03-17 04:48:10.218 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
03-17 04:48:10.228 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.ActivityThread
03-17 04:48:10.228 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ActivityThread.java
03-17 04:48:10.228 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 2023
03-17 04:48:10.228 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: performLaunchActivity
03-17 04:48:10.228 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 7 element  ----
03-17 04:48:10.238 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
03-17 04:48:10.238 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.ActivityThread
03-17 04:48:10.238 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ActivityThread.java
03-17 04:48:10.238 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 2084
03-17 04:48:10.248 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: handleLaunchActivity
03-17 04:48:10.248 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 8 element  ----
03-17 04:48:10.248 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.ActivityThread.access$600(ActivityThread.java:130)
03-17 04:48:10.258 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.ActivityThread
03-17 04:48:10.258 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ActivityThread.java
03-17 04:48:10.258 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 130
03-17 04:48:10.258 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: access$600
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 9 element  ----
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.ActivityThread$H
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ActivityThread.java
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 1195
03-17 04:48:10.268 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: handleMessage
03-17 04:48:10.278 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 10 element  ----
03-17 04:48:10.278 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.os.Handler.dispatchMessage(Handler.java:99)
03-17 04:48:10.278 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.os.Handler
03-17 04:48:10.278 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Handler.java
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 99
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: dispatchMessage
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 11 element  ----
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.os.Looper.loop(Looper.java:137)
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.os.Looper
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Looper.java
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 137
03-17 04:48:10.288 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: loop
03-17 04:48:10.300 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 12 element  ----
03-17 04:48:10.300 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: android.app.ActivityThread.main(ActivityThread.java:4745)
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: android.app.ActivityThread
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ActivityThread.java
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 4745
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: main
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 13 element  ----
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: java.lang.reflect.Method.invokeNative(Native Method)
03-17 04:48:10.308 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: java.lang.reflect.Method
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Method.java
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: -2
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: invokeNative
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 14 element  ----
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: java.lang.reflect.Method.invoke(Method.java:511)
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: java.lang.reflect.Method
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: Method.java
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 511
03-17 04:48:10.318 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: invoke
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 15 element  ----
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: com.android.internal.os.ZygoteInit$MethodAndArgsCaller
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ZygoteInit.java
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 786
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: run
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 16 element  ----
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: com.android.internal.os.ZygoteInit
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: ZygoteInit.java
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: 553
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: main
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ----  the 17 element  ----
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: toString: dalvik.system.NativeStart.main(Native Method)
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: ClassName: dalvik.system.NativeStart
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: FileName: NativeStart.java
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: LineNumber: -2
03-17 04:48:10.328 701-701/com.loaderman.getthreadstatusdemo I/System.out: MethodName: main

可以发现当获取stack trace的语句放在另一个方法（工具类方法）中的时候，数组索引为3的元素可以找到该工具类方法的调用地点。
在此例中，找到的是onCreate()方法中的第12行。

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本文学习来源:http://www.jianshu.com/p/71fefdf6d62c

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