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社区首页 >问答首页 >在asyncTask中显示进度对话框

问在asyncTask中显示进度对话框
EN

Stack Overflow用户
提问于 2013-12-11 16:10:28
回答 2查看 329关注 0票数 0

我有一个异步任务，用于从web服务获取结果。在我的类中，我试图显示和隐藏一个进度对话框。但是，在从web服务获取结果的过程中，会出现一些错误，如您在log cat中所看到的。我认为问题是我试图在异步模式下获得结果，然后完成当前的活动。由于我的异步任务是在构造函数中获取我的活动并使用该构造函数来显示ProgressDialog，因此在完成该活动并尝试在异步任务中显示另一个进度对话框后，出现了此问题。我该怎么办？

代码语言：javascript
复制
public class AsyncCallWs extends AsyncTask<String, Void, String> {

    private ProgressDialog dialog;
    public String methodName="";
    private WebService ws;
    private ArrayList<ServiceParam> paramsList;
    private boolean hasParams; 
    private Activity activity;
    private OnTaskCompleted listener;

    public AsyncCallWs(Activity activity,OnTaskCompleted listener,String methodName) {
        xLog.position();
        try {
            this.methodName = methodName;
            this.activity = activity;
            hasParams = false;
            this.listener = listener;
        } catch (Exception e) {
            xLog.error(e.getMessage());
        }
    }

    public AsyncCallWs(Activity activity,OnTaskCompleted listener,String methodName,ArrayList<ServiceParam> params) {
        xLog.position();
        try {
            this.methodName = methodName;
            this.activity = activity;
            this.paramsList = params;
            hasParams = true;
            this.listener = listener;
        } catch (Exception e) {
            xLog.error(e.getMessage());
        }
    }

    @Override
    protected void onPreExecute() {
        this.dialog = new ProgressDialog(activity);
        this.dialog.setMessage("Loading...");
        this.dialog.show();
    }

    @Override
    protected String doInBackground(String... params) {
        //Do something...
    }

    @Override
    protected void onPostExecute(String result) {
        xLog.position();

        if (this.dialog.isShowing()) {
            this.dialog.dismiss();
        }
        listener.onTaskCompleted(result,methodName);
        xLog.info("Output of current AsyncTask is:"+ result);

    }
}

Logcat：

代码语言：javascript
复制
12-11 08:08:58.808: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fc05a0 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.808: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fc05a0 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
12-11 08:08:58.808: E/WindowManager(26772):     at android.app.Dialog.show(Dialog.java:281)
12-11 08:08:58.808: E/WindowManager(26772):     at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85)
12-11 08:08:58.808: E/WindowManager(26772):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-11 08:08:58.808: E/WindowManager(26772):     at android.os.AsyncTask.execute(AsyncTask.java:534)
12-11 08:08:58.808: E/WindowManager(26772):     at com.example.shareholders.Sync.doSync(Sync.java:307)
12-11 08:08:58.808: E/WindowManager(26772):     at com.example.shareholders.Login.clickHandler(Login.java:70)
12-11 08:08:58.808: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.808: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.View$1.onClick(View.java:3594)
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.View.performClick(View.java:4204)
12-11 08:08:58.808: E/WindowManager(26772):     at android.view.View$PerformClick.run(View.java:17355)
12-11 08:08:58.808: E/WindowManager(26772):     at android.os.Handler.handleCallback(Handler.java:725)
12-11 08:08:58.808: E/WindowManager(26772):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-11 08:08:58.808: E/WindowManager(26772):     at android.os.Looper.loop(Looper.java:137)
12-11 08:08:58.808: E/WindowManager(26772):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:58.808: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.808: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.808: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:58.808: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:58.808: E/WindowManager(26772):     at dalvik.system.NativeStart.main(Native Method)
12-11 08:08:58.837: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fef4a8 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.837: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fef4a8 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
12-11 08:08:58.837: E/WindowManager(26772):     at android.app.Dialog.show(Dialog.java:281)
12-11 08:08:58.837: E/WindowManager(26772):     at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85)
12-11 08:08:58.837: E/WindowManager(26772):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-11 08:08:58.837: E/WindowManager(26772):     at android.os.AsyncTask.execute(AsyncTask.java:534)
12-11 08:08:58.837: E/WindowManager(26772):     at com.example.shareholders.Sync.doSync(Sync.java:311)
12-11 08:08:58.837: E/WindowManager(26772):     at com.example.shareholders.Login.clickHandler(Login.java:70)
12-11 08:08:58.837: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.837: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.View$1.onClick(View.java:3594)
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.View.performClick(View.java:4204)
12-11 08:08:58.837: E/WindowManager(26772):     at android.view.View$PerformClick.run(View.java:17355)
12-11 08:08:58.837: E/WindowManager(26772):     at android.os.Handler.handleCallback(Handler.java:725)
12-11 08:08:58.837: E/WindowManager(26772):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-11 08:08:58.837: E/WindowManager(26772):     at android.os.Looper.loop(Looper.java:137)
12-11 08:08:58.837: E/WindowManager(26772):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:58.837: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.837: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.837: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:58.837: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:58.837: E/WindowManager(26772):     at dalvik.system.NativeStart.main(Native Method)
12-11 08:08:58.867: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fb88b0 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.867: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fb88b0 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
12-11 08:08:58.867: E/WindowManager(26772):     at android.app.Dialog.show(Dialog.java:281)
12-11 08:08:58.867: E/WindowManager(26772):     at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85)
12-11 08:08:58.867: E/WindowManager(26772):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-11 08:08:58.867: E/WindowManager(26772):     at android.os.AsyncTask.execute(AsyncTask.java:534)
12-11 08:08:58.867: E/WindowManager(26772):     at com.example.shareholders.Sync.doSync(Sync.java:316)
12-11 08:08:58.867: E/WindowManager(26772):     at com.example.shareholders.Login.clickHandler(Login.java:70)
12-11 08:08:58.867: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.867: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.View$1.onClick(View.java:3594)
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.View.performClick(View.java:4204)
12-11 08:08:58.867: E/WindowManager(26772):     at android.view.View$PerformClick.run(View.java:17355)
12-11 08:08:58.867: E/WindowManager(26772):     at android.os.Handler.handleCallback(Handler.java:725)
12-11 08:08:58.867: E/WindowManager(26772):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-11 08:08:58.867: E/WindowManager(26772):     at android.os.Looper.loop(Looper.java:137)
12-11 08:08:58.867: E/WindowManager(26772):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:58.867: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.867: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.867: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:58.867: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:58.867: E/WindowManager(26772):     at dalvik.system.NativeStart.main(Native Method)
12-11 08:08:58.878: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4102c668 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.878: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4102c668 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
12-11 08:08:58.878: E/WindowManager(26772):     at android.app.Dialog.show(Dialog.java:281)
12-11 08:08:58.878: E/WindowManager(26772):     at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85)
12-11 08:08:58.878: E/WindowManager(26772):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-11 08:08:58.878: E/WindowManager(26772):     at android.os.AsyncTask.execute(AsyncTask.java:534)
12-11 08:08:58.878: E/WindowManager(26772):     at com.example.shareholders.Sync.doSync(Sync.java:320)
12-11 08:08:58.878: E/WindowManager(26772):     at com.example.shareholders.Login.clickHandler(Login.java:70)
12-11 08:08:58.878: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.878: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.View$1.onClick(View.java:3594)
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.View.performClick(View.java:4204)
12-11 08:08:58.878: E/WindowManager(26772):     at android.view.View$PerformClick.run(View.java:17355)
12-11 08:08:58.878: E/WindowManager(26772):     at android.os.Handler.handleCallback(Handler.java:725)
12-11 08:08:58.878: E/WindowManager(26772):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-11 08:08:58.878: E/WindowManager(26772):     at android.os.Looper.loop(Looper.java:137)
12-11 08:08:58.878: E/WindowManager(26772):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:58.878: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.878: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.878: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:58.878: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:58.878: E/WindowManager(26772):     at dalvik.system.NativeStart.main(Native Method)
12-11 08:08:58.898: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4103cd98 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.898: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4103cd98 V.E..... R.....ID 0,0-168,114} that was originally added here
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
12-11 08:08:58.898: E/WindowManager(26772):     at android.app.Dialog.show(Dialog.java:281)
12-11 08:08:58.898: E/WindowManager(26772):     at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85)
12-11 08:08:58.898: E/WindowManager(26772):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
12-11 08:08:58.898: E/WindowManager(26772):     at android.os.AsyncTask.execute(AsyncTask.java:534)
12-11 08:08:58.898: E/WindowManager(26772):     at com.example.shareholders.Sync.doSync(Sync.java:325)
12-11 08:08:58.898: E/WindowManager(26772):     at com.example.shareholders.Login.clickHandler(Login.java:70)
12-11 08:08:58.898: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.898: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.View$1.onClick(View.java:3594)
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.View.performClick(View.java:4204)
12-11 08:08:58.898: E/WindowManager(26772):     at android.view.View$PerformClick.run(View.java:17355)
12-11 08:08:58.898: E/WindowManager(26772):     at android.os.Handler.handleCallback(Handler.java:725)
12-11 08:08:58.898: E/WindowManager(26772):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-11 08:08:58.898: E/WindowManager(26772):     at android.os.Looper.loop(Looper.java:137)
12-11 08:08:58.898: E/WindowManager(26772):     at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:58.898: E/WindowManager(26772):     at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:58.898: E/WindowManager(26772):     at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:58.898: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:58.898: E/WindowManager(26772):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:58.898: E/WindowManager(26772):     at dalvik.system.NativeStart.main(Native Method)


12-11 08:08:59.118: D/AndroidRuntime(26772): Shutting down VM
12-11 08:08:59.138: W/dalvikvm(26772): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
12-11 08:08:59.167: E/AndroidRuntime(26772): FATAL EXCEPTION: main
12-11 08:08:59.167: E/AndroidRuntime(26772): java.lang.IllegalArgumentException: View not attached to window manager
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:383)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:285)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:79)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.app.Dialog.dismissDialog(Dialog.java:323)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.app.Dialog.dismiss(Dialog.java:306)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at ClassLibrary.AsyncCallWs.onPostExecute(AsyncCallWs.java:113)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at ClassLibrary.AsyncCallWs.onPostExecute(AsyncCallWs.java:1)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.os.AsyncTask.finish(AsyncTask.java:631)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.os.Looper.loop(Looper.java:137)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at android.app.ActivityThread.main(ActivityThread.java:5041)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at java.lang.reflect.Method.invokeNative(Native Method)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at java.lang.reflect.Method.invoke(Method.java:511)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-11 08:08:59.167: E/AndroidRuntime(26772):    at dalvik.system.NativeStart.main(Native Method)
android
android-asynctask
progressdialog
EN

回答 2

Stack Overflow用户

发布于 2013-12-11 16:13:13

您需要在完成Activity之前调用this.dialog.dismiss();

票数 0
EN

Stack Overflow用户

发布于 2013-12-11 16:15:44

您可以使用无头片段，并在其中进行异步处理，而不是在activity中。

这里有一个教程：http://techbandhu.wordpress.com/2013/07/02/android-headless-fragment/

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/20513771

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