Log 打印当前代码行数及类名

Posted 2022-11-30 AAA啊哈

本文

http://afra55.github.io/2017/11/14/auto-get-current-code-line/

LogUtils

/**
 * Created by Afra55 on 2017/11/14.
 * Smile is the best name card.
 */
public class LogUtils 

    private static String getSimpleClassName(String name) 
        int lastIndex = name.lastIndexOf(".");
        return name.substring(lastIndex + 1);
    


    public static void i(String msg) 
        StackTraceElement[] trace = Thread.currentThread().getStackTrace();

        int methodCount = 1;
        int stackOffset = getStackOffset(trace);

        if (methodCount + stackOffset > trace.length) 
            methodCount = trace.length - stackOffset - 1;
        

        for (int i = methodCount; i > 0; i--) 
            int stackIndex = i + stackOffset;
            if (stackIndex >= trace.length) 
                continue;
            
            StackTraceElement element = trace[stackIndex];

            StringBuilder builder = new StringBuilder();
            builder.append(getSimpleClassName(element.getClassName()))
                    .append(".")
                    .append(element.getMethodName())
                    .append(" ")
                    .append(" (")
                    .append(element.getFileName())
                    .append(":")
                    .append(element.getLineNumber())
                    .append(")")
                    .append(" | ")
                    .append(msg);

            Log.i(getSimpleClassName(element.getClassName()), builder.toString());

        
    

    private static int getStackOffset(StackTraceElement[] trace) 
        for (int i = 2; i < trace.length; i++) 
            StackTraceElement e = trace[i];
            String name = e.getClassName();
            if (!name.equals(LogUtils.class.getName())) 
                return --i;
            
        
        return -1;
    

举例

public class MainActivity extends Activity 


  private void onJJ() 
    onBB();
  
  private void onBB() 
    LogUtils.i("onBB");
  
  @Override
  protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    LogUtils.i("message");

    onJJ();
  

输出日志：

I/MainActivity: MainActivity.onCreate  (MainActivity.java:32) | message
I/MainActivity: MainActivity.onBB  (MainActivity.java:25) | onBB