1 <?xml version="1.0" encoding="utf-8"?>
2 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:app="http://schemas.android.com/apk/res-auto"
4 xmlns:tools="http://schemas.android.com/tools"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 tools:context=".MainActivity">
8
9 <ImageView
10 android:id="@+id/imageview"
11 android:layout_width="match_parent"
12 android:layout_height="match_parent"
13 tools:layout_editor_absoluteX="50dp"
14 tools:layout_editor_absoluteY="-25dp" />
15
16 </android.support.constraint.ConstraintLayout>
activity_main.xml
1 package com.example.daojishi;
2
3 import android.os.Handler;
4 import android.os.Message;
5 import android.support.v7.app.AppCompatActivity;
6 import android.os.Bundle;
7 import android.widget.ImageView;
8
9 public class MainActivity
extends AppCompatActivity {
10
11 private ImageView imageview;
12 private Handler handler;
13 @Override
14 protected void onCreate(Bundle savedInstanceState) {
15 super.onCreate(savedInstanceState);
16 setContentView(R.layout.activity_main);
17 imageview =
(ImageView)findViewById(R.id.imageview);
18 handler =
new Handler(){
19 @Override
20 public void dispatchMessage(Message msg) {
21 super.dispatchMessage(msg);
22 if(msg.what==1
){
23 String pic = "p" +
msg.obj;
24 int resID = getResources().getIdentifier(pic,"mipmap"
,getPackageName());
25 imageview.setImageResource(resID);
26 }
27 }
28 };
29 new Thread(){
30 @Override
31 public void run() {
32 super.run();
33 int num = 9
;
34 while(num>=0
)
35 {
36 try{
37 Thread.sleep(1000
);
38 }
catch(Exception e ){
39 e.printStackTrace();
40 }
41 Message msg =
new Message();
42 msg.what=1
;
43 msg.obj=
num;
44 handler.sendMessage(msg);
45 num--
;
46 }
47 }
48 }.start();
49 }
50 }
MainActivity.java
转载于:https://www.cnblogs.com/jdxb/p/10941748.html
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