目录
05-09 09:41:27.356 1128-1128/org.mazhuang.multicastdemo E/AndroidRuntime: FATAL EXCEPTION: main
Process: org.mazhuang.multicastdemo, PID: 1128
java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131165270, class android.widget.ListView) with Adapter(class android.widget.SimpleAdapter)]
at android.widget.ListView.layoutChildren(ListView.java:1618)
at android.widget.AbsListView.onLayout(AbsListView.java:2161)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:727)
at android.view.View.layout(View.java:17548)
at android.view.ViewGroup.layout(ViewGroup.java:5614)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2383)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2110)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1287)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6363)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873)
at android.view.Choreographer.doCallbacks(Choreographer.java:685)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859)
at android.os.Handler.handleCallback(Handler.java:754)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6337)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)
new Thread() {
@Override
public void run() {
// ...
mData.add(data);
MainActivity.this.runOnUiThread(() -> {
mAdapter.notifyDataSetChanged();
}
// ...
}
}.start();
根据出错堆栈里的关键提示：
The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes.
更新 Adapter 里的数据并 notifyDataSetChanged 需要在 UI 线程里进行。如果在子线程里更新了数据，而在 UI 线程里稍后更新代码，就有可能在一个时间差内数据与界面状态不一致，从而导致崩溃。
在 UI 线程里面更新 Adapter 里的数据，并 notifyDataSetChanged，即：
new Thread() {
@Override
public void run() {
// ...
MainActivity.this.runOnUiThread(() -> {
mData.add(data);
mAdapter.notifyDataSetChanged();
}
// ...
}
}.start();