Android子线程-阿里云

Android为什么不能在子线程更新UI

Android为什么不能在子线程更新UI？ // Android中为什么子线程不能更新UI？ viewRootImpl对象是在Activity中的onResume方法执行完成之后，View变得可见时才创建的，之前的操作是没有进行线程检查的，所以没有报错。但是ViewRootImpl创建之后，由于进行...

Android 中ProgressDialog进度条对话框的使用(使用子线程模拟更新进度)

前言：使用ProgressDialog可以实现多种样式，今天我们就来实现模拟水平进度条更新的效果。具体实现：布局页面一个按钮就不再说明。下面来看在Activity代码中的实现：public class MainActivity extends AppCompatActivity implements...

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Android在子线程中更新UI的方法汇总(共七种)

Android在子线程中更新UI的方法汇总(共七种)1、常规写法：new Handler()的handleMessage()和handler.sendMessage(msg) Handler handler = new Handler() { @Override public void handle...

【Android 异步操作】Android 线程切换 ( 判定当前线程是否是主线程 | 子线程中执行主线程方法 | 主线程中执行子线程方法 )

文章目录一、判定当前线程是否是主线程二、子线程中执行主线程方法三、主线程中执行子线程方法一、判定当前线程是否是主线程在 Android 中 , 如果要判定当前线程是否是主线程 , 可以使用如下方法进行判定 ;调用 Looper 的 getMainLooper() 静态方法获取 mainLooper ...

Android之HandlerThread源码分析和简单使用（主线程和子线程通信、子线程和子线程通信）

3、简单分析例子 1）、原始页面效果 2）、控制台初始化打印的线程ID 分析：在onCreate方法里面打印的...

Android之HandlerThread源码分析和简单使用（主线程和子线程通信、子线程和子线程通信1）

1、先熟悉handler方式实现主线程和子线程互相通信方式，子线程和子线程的通信方式如果不熟悉或者忘记了，请参考我的这篇博客 Android之用Handler实现主线程和子线程互相通信以及子线程和子线程之间的通信 &...

Android通过子线程更新UI的几种方式

Android通过子线程更新UI的几种方式一般情况下，UI的更新都少不了Handler，首先我们先了解一下Handler机制： Handler消息机制定义 Message线程间通信的数据单元，可通过message携带需要的数据创建对象：Message.obtain(what) HandlerHan...

为什么我的子线程更新了 UI 没报错？借此，纠正一些Android 程序员的一个知识误区

开门见山: 这个误区是：子线程不能更新 UI ，其应该分类讨论，而不是绝对的。半小时前，我的 XRecyclerView 群里面，一位群友私聊我，问题是：为什么我的子线程更新了 UI 没报错？我叫他发下代码我看，如下，十分简单的代码。 @Override protected void onCr...

Android -- ViewRoot，关于子线程刷新UI

Android在4.0之后执行线程更新UI操作会报异常：CalledFromWrongThreadException：Only the original thread that created a view hierarchy can touch its views.那么你肯定能看到很多文章说and...

Android ThreadUtil 线程公共类，判断是否在主线程/ 子线程执行相关操作

前言：通常，我们写的公共的模块给别人用，但是这个模块又必须在特定的线程中执行。比如，一个加载网络图片的的方法，需要在子线程中执行。 /** * 加载网络图片 */ private void loadImage() { try { //用延时3...

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更新时间 2024-04-03 10:22:52

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