安卓开发线程

Posted 2021-01-30 huangyan1022

Layout 不要加载大的图片 

  添加图片 在代码中

constraintLayout = findViewById(R.id.logconstrain);

constraintLayout.setBackground(ContextCompat.getDrawable(getApplicationContext(),R.drawable.logbackground));


子线程

第一种回到住线程更新

import android.os.Handler;

//声明Handle

private Handler handlerd = new Handler(){

    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);




        Log.v("Main","s11133sf"+String.valueOf(Thread.currentThread())+"fff"+msg.what+"msg:"+msg);


    }
};

//安卓子线程

//子线程耗时操作

     new  Thread(new Runnable() {
         @Override
         public void run() {




             //耗时操作  发送一次 调用一次
           //  handlerd.sendEmptyMessage(1);

             handlerd.sendEmptyMessage(0);
             Message msg =new Message();
             msg.obj = "数据";//可以是基本类型，可以是对象，可以是List、map等
             handlerd.sendMessage(msg);


         }
     }).start();

第二种
new Thread(new Runnable() {
    @Override
    public void run() {
        // 写子线程中的操作

        try {


            Thread.sleep(2);

            Log.v("Main","aaafflllkopeeewqqqlllpppaaqqq"+String.valueOf(Thread.currentThread()));

        } catch (InterruptedException e) {

            e.printStackTrace();

        }

        Log.v("Main","sdjjjfsf"+String.valueOf(Thread.currentThread()));

    }
}).start();