Question

我想以动态方式更改布局背景。

以下是LogCat的日志：

04-10 14:59:55.291: WARN/dalvikvm(263): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
04-10 14:59:55.309: ERROR/AndroidRuntime(263): Uncaught handler: thread Thread-8 exiting due to uncaught exception
04-10 14:59:55.331: ERROR/AndroidRuntime(263): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.ViewRoot.checkThread(ViewRoot.java:2683)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.ViewRoot.requestLayout(ViewRoot.java:557)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.requestLayout(View.java:7918)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.requestLayout(View.java:7918)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.requestLayout(View.java:7918)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.requestLayout(View.java:7918)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.setBackgroundDrawable(View.java:7275)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at android.view.View.setBackgroundResource(View.java:7188)
04-10 14:59:55.331: ERROR/AndroidRuntime(263):     at walk.me.Splasher$1.run(Splasher.java:35)

walk.me.Splasher$1.run(Splasher.java:35) is this line:  

layout.setBackgroundResource(temp); What should I do?

Answer 1

使用处理程序或在UI线程上运行它。 处理程序可以更好地完成此任务。

    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            // TODO Auto-generated method stub

        }
    });

Answer 2

您无法从后台线程修改用户界面。请参阅文章PainlessThreading。从代码的结构来看，我强烈建议您使用该文章中描述的AsyncTask。它允许您运行后台线程，该线程重复触发UI线程上的操作。一旦学习了如何使用AsyncTask类，这种事情比将单个Runnable对象提供给Handler更容易。

动态更改布局背景

2 个答案: