处理来自其他线程的 UI
我有一个扩展了 Runnable 的类。这个类在不同的线程中执行一些繁重的操作（基本上是从网络下载图像）。我想从此类更新 UI（将下载的图像显示到 ImageView）。我尝试过使用处理程序但没有成功。这是我的代码：
class DataReceiver implements Runnable
{
public Bitmap bmp;
Public Handler uiHandle;
@Override
public void run()
{
while(true)
{
//do image download process here
}
}
}
在主要活动中
ImageView img = (ImageView)findViewById(R.id.dispImg);
DataReceiver dr=new DataReceiver();
Handler uiHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
updateUI();
}
}
dr.uiHandle = uiHandler;
(new Thread(dr)).start();
public void updateUI()
{
img.setBitmap(dr.bmp);
}
这是更新 UI 的正确方法吗？
I have a class which extends the Runnable. This class performs some heavy operation (basically downloads the image from network) in different thread. I want to update the UI (display the downloaded image to an ImageView) from this class. I have tried using handler but did not succeed. Here is my code:
class DataReceiver implements Runnable
{
public Bitmap bmp;
Public Handler uiHandle;
@Override
public void run()
{
while(true)
{
//do image download process here
}
}
}
In main activity
ImageView img = (ImageView)findViewById(R.id.dispImg);
DataReceiver dr=new DataReceiver();
Handler uiHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
updateUI();
}
}
dr.uiHandle = uiHandler;
(new Thread(dr)).start();
public void updateUI()
{
img.setBitmap(dr.bmp);
}
Is it the correct method for updating UI?
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评论（3）
您可以改用 AsyncTask，在 doInBackground 的 run() 中执行当前正在执行的操作，然后在任务的 onPostExecute 中执行 UI 更新。
You could use AsyncTask instead, do what you're currently doing in run() in doInBackground, and then do the UI update in the task's onPostExecute.
几乎;D你需要在类线程上添加该行之前，同时执行：
almost ;D you need on the class thread add the that linebefore while do:
要从另一个线程更新 UI，请使用
To update the UI from another thread use