Android开发--线程间通信

参考：简书文章

今天作业是关于线程间通信，线程间通信有好几种方式，本次使用Handler机制，其他日后补充。

题目：准备五张图片， 随着子线程的变化，图片和计数器会进行有规律的变化。如图：

 

 

 

package com.zzu.jiaoyanyan.animation;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    ImageView imageView;
    TextView all;
    TextView index;
    Handler handler;
    ArrayList<Integer> image;
    Runnable myRunnable1;
    int count, total;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = findViewById(R.id.imageView);
        all = findViewById(R.id.textView3);
        index = findViewById(R.id.textView4);

        image = new ArrayList<>();
        image.add(R.drawable.animation1);
        image.add(R.drawable.animation2);
        image.add(R.drawable.animation3);
        image.add(R.drawable.animation4);
        image.add(R.drawable.animation5);

        handler = new Handler(){
            @Override
            public void handleMessage(@NonNull Message msg) {
                super.handleMessage(msg);
                int i = total % 5;
                total += 1;
                imageView.setImageResource(image.get(i));

                all.setText(""+ total);//????奇怪的东西出现了
                count = i+1;
                index.setText(" "+count);
            }
        };

         myRunnable1= new Runnable() {
            @Override
            public void run() {
                while (true){
                    Log.d("TAG", "I am Sub Thread.");
                    Message message = new Message();
                    handler.sendMessage(message);
                    try {
                        Thread.sleep(800);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        };

        Thread t = new Thread(myRunnable1);
        t.start();

    }

}