Looper Dump Demo

HandleDump.java

package com.github.linsea.exceptiontest;

//import android.support.v7.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.util.LogPrinter;
import android.view.View;

public class MainActivity extends Activity {

    private static final String TAG = "Main";

    private MyHandler handler = new MyHandler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View dump = findViewById(R.id.dump);
        dump.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d(TAG, "onClick");
                handler.dump(new LogPrinter(Log.DEBUG, "DumpTag"),"DumpPrefix ");
            }
        });

    }

    @Override
    protected void onPostResume() {
        super.onPostResume();

        new Thread(){
            @Override
            public void run() {
                for (int i = 0; i < 10; i++) {
                    Log.v(TAG, "Send Message to Target, index=" + i);
                    handler.obtainMessage(i, 10 * i, 100 * i).sendToTarget();
                        handler.dump(new LogPrinter(Log.DEBUG, "DumpTag"),"DumpPrefix ");

                    Log.v(TAG, "PostDelayed RunnableTask, index=" + i);
                    handler.postDelayed(new RunnableTask(i), i * 1000);
                    try {
                        Thread.sleep(1000L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();

    }

    static class MyHandler extends Handler{
        @Override
        public void handleMessage(Message msg) {
            Log.i(TAG, "MyHandler handleMessage: " + msg.toString());
        }
    }

    static class RunnableTask implements Runnable{
        int id;

        public RunnableTask(int id) {
            this.id = id;
        }

        @Override
        public void run() {
            Log.i(TAG, "run RunTask:" + id);
        }
    }

}

// 输出case:
//06-17 15:25:55.620 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix Handler (com.github.linsea.exceptiontest.MainActivity$MyHandler) {1bc81c68} @ 69897804
//06-17 15:25:55.620 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix   Looper (main, tid 1) {2d4bf881}
//06-17 15:25:55.620 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 0: { when=0 what=3 arg1=30 arg2=300 target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:55.620 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 1: { when=+1s0ms callback=com.github.linsea.exceptiontest.MainActivity$RunnableTask target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:55.620 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     (Total messages: 2, idling=false, quitting=false)

// 输出case:
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix Handler (com.github.linsea.exceptiontest.MainActivity$MyHandler) {1bc81c68} @ 69900806
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix   Looper (main, tid 1) {2d4bf881}
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 0: { when=-1ms callback=com.github.linsea.exceptiontest.MainActivity$RunnableTask target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 1: { when=0 what=6 arg1=60 arg2=600 target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 2: { when=+1s999ms callback=com.github.linsea.exceptiontest.MainActivity$RunnableTask target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     Message 3: { when=+4s0ms callback=com.github.linsea.exceptiontest.MainActivity$RunnableTask target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
//06-17 15:25:58.610 6789-6819/com.github.linsea.exceptiontest V/DumpTag: DumpPrefix     (Total messages: 4, idling=true, quitting=false)

//Message 1: { when=0 what=6 arg1=60 arg2=600 target=com.github.linsea.exceptiontest.MainActivity$MyHandler }
// when=0 表示这个message应当在当前时间运行，但目前由于调度原因还队列中还没有运行。
// when=-10ms 表示这个message应当在当前时间前10ms运行，但目前由于调度原因还队列中还没有运行。
// when=+10ms 表示这个message应当在当前时间过后10ms运行，目前还队列中等待调度没有运行。