Android应用程序在杀死应用程序之后运行错误的UI线程？

Question

我的应用程序有一个GCMIntentService扩展到GCMBaseIntentService上。当收到消息时，我将打开一个包含Webview的活动。在这里，代码：

GCMIntentService

public class GCMIntentService extends GCMBaseIntentService {
    @Override
    protected void onMessage(Context context, Intent intent) {
        Intent intent = new Intent(context, MyActivity.class);
        context.startActivity(intent);
    }
}

MyActiviy：

public class MyActiviy extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        webView = new WebView(MyActiviy.this); 
        /*This throw an exception "java.lang.IllegalStateException:
        Calling View methods on another thread than the UI thread."*/
    }
}

Normaly，这段代码运行良好，但是当我在“最近的应用程序”上杀死应用程序并推送消息时，当在MyActivity上创建一个新的webview实例时，应用程序就会崩溃。

我已经尝试了下面的代码：

public class MyActiviy extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                webView = new WebView(MyActiviy.this);
                boolean isRunOnUIThread = Looper.myLooper() == Looper.getMainLooper();
                Log.i("CheckThread","is running on UI thread: " + isRunOnUIThread )
                // This log return true
            }
        });

    }
}

但这不管用。

撞车日志：

    java.lang.RuntimeException: Unable to start activity ComponentInfo{my.package.name/my.package.name.MyActivity}: java.lang.IllegalStateException: Calling View methods on another thread than the UI thread.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.IllegalStateException: Calling View methods on another thread than the UI thread.
            at com.android.webview.chromium.WebViewChromium.createThreadException(WebViewChromium.java:287)
            at com.android.webview.chromium.WebViewChromium.checkThread(WebViewChromium.java:309)
            at com.android.webview.chromium.WebViewChromium.init(WebViewChromium.java:220)
            at android.webkit.WebView.<init>(WebView.java:606)
            at android.webkit.WebView.<init>(WebView.java:542)
            at android.webkit.WebView.<init>(WebView.java:525)
            at android.webkit.WebView.<init>(WebView.java:512)
            at android.webkit.WebView.<init>(WebView.java:502)
            at my.package.name.MyActivity$2.run(MyActivity.java:254)
            at android.app.Activity.runOnUiThread(Activity.java:5511)
            at my.package.name.MyActivity.onCreate(MyActivity.java:246)
            at android.app.Activity.performCreate(Activity.java:6237)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我想我的应用程序运行在“错误的UI线程”:D上。

或者checkThread()的WebWiew方法是错误的。

注意:这个错误只有在我杀死应用程序并推送消息之后才会发生。

有人能帮我解决这个问题吗？非常感谢。

附加信息:此bug仅发生在android和up (>= 5.0)上。

Answer 1

当您从服务开始活动时，请在您的意图中添加Intent.FLAG_ACTIVITY_NEW_TASK标志。

    Intent intent = new Intent(context, MyActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(intent);

Answer 2

更改代码开始活动行，如下所示：

Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {

        @Override
        public void run() {
            Intent intent = new Intent(context, MyActivity.class);
            context.startActivity(intent);
        }
    });