安卓开发线程

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();

安卓开发线程

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