通知中的进度条 [ANDROID]

Question

我知道有很多关于它的话题。我知道有 android 开发者网站，即使我使用这个网站的代码，我也有错误。

我只想在通知中放置一个进度条。 所以我称这个方法是我从 Android 开发者网站获取的：

public static void generateNotification(Context context){   

    final NotificationManager mNotifyManager =(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    final Notification.Builder mBuilder = new Notification.Builder(context);
    mBuilder.setContentTitle("Picture Download")
            .setContentText("Download in progress");
    // Start a lengthy operation in a background thread
    new Thread(
        new Runnable() {
            @Override
            public void run() {
                int incr;

                for (incr = 0; incr <= 100; incr+=5) {

                        mBuilder.setProgress(100, incr, false);                        
                        mNotifyManager.notify(0, mBuilder.build());

                            try {

                                Thread.sleep(5*1000);
                            } catch (InterruptedException e) {
                                Log.d("Generate Notif", "sleep failure");
                            }
                }
                // When the loop is finished, updates the notification
                mBuilder.setContentText("Download complete")
                .setProgress(0,0,false);
                mNotifyManager.notify(100, mBuilder.build());
            }
        }
    // Starts the thread by calling the run() method in its Runnable
    ).start();
}

我有这个错误：

10-01 15:37:42.226: E/AndroidRuntime(9840): FATAL EXCEPTION: Thread-1250
10-01 15:37:42.226: E/AndroidRuntime(9840): java.lang.NoSuchMethodError: android.app.Notification$Builder.build
10-01 15:37:42.226: E/AndroidRuntime(9840): at com.Tools.UtilClass$10.run(UtilClass.java:813)
10-01 15:37:42.226: E/AndroidRuntime(9840): at java.lang.Thread.run(Thread.java:856)

还有这个：

E/WindowManager(9840): Activity com.main.LoginConnection has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@410c2238 that was originally added here
E/WindowManager(9840): android.view.WindowLeaked: Activity com.main.LoginConnection has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@410c2238 that was originally added here
E/WindowManager(9840):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
E/WindowManager(9840):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
E/WindowManager(9840):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
E/WindowManager(9840):  at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
E/WindowManager(9840):  at android.view.Window$LocalWindowManager.addView(Window.java:537)
E/WindowManager(9840):  at android.app.Dialog.show(Dialog.java:278)
E/WindowManager(9840):  at com.main.LoginConnection.getRegisterId(LoginConnection.java:281)
E/WindowManager(9840):  at com.main.LoginConnection.onCreate(LoginConnection.java:101)
E/WindowManager(9840):  at android.app.Activity.performCreate(Activity.java:4465)
E/WindowManager(9840):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/WindowManager(9840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
E/WindowManager(9840):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
E/WindowManager(9840):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
E/WindowManager(9840):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
E/WindowManager(9840):  at android.os.Handler.dispatchMessage(Handler.java:99)
E/WindowManager(9840):  at android.os.Looper.loop(Looper.java:137)
E/WindowManager(9840):  at android.app.ActivityThread.main(ActivityThread.java:4424)
E/WindowManager(9840):  at java.lang.reflect.Method.invokeNative(Native Method)
E/WindowManager(9840):  at java.lang.reflect.Method.invoke(Method.java:511)
E/WindowManager(9840):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/WindowManager(9840):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/WindowManager(9840):  at dalvik.system.NativeStart.main(Native Method)
E/WindowManager(9840): Activity com.main.LoginConnection has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41162188 that was originally added here
E/WindowManager(9840): android.view.WindowLeaked: Activity com.main.LoginConnection has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41162188 that was originally added here
E/WindowManager(9840):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
E/WindowManager(9840):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
E/WindowManager(9840):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
E/WindowManager(9840):  at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
E/WindowManager(9840):  at android.view.Window$LocalWindowManager.addView(Window.java:537)
E/WindowManager(9840):  at android.app.Dialog.show(Dialog.java:278)
E/WindowManager(9840):  at com.Tools.UtilClass.openSettingApp(UtilClass.java:557)
E/WindowManager(9840):  at com.Tools.UtilClass$4.onClick(UtilClass.java:383)
E/WindowManager(9840):  at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
E/WindowManager(9840):  at android.os.Handler.dispatchMessage(Handler.java:99)
E/WindowManager(9840):  at android.os.Looper.loop(Looper.java:137)
E/WindowManager(9840):  at android.app.ActivityThread.main(ActivityThread.java:4424)
E/WindowManager(9840):  at java.lang.reflect.Method.invokeNative(Native Method)
E/WindowManager(9840):  at java.lang.reflect.Method.invoke(Method.java:511)
E/WindowManager(9840):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/WindowManager(9840):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/WindowManager(9840):  at dalvik.system.NativeStart.main(Native Method)

所以我不明白为什么会出现这个错误......

Answer 1

首先，我建议使用NotificationCompat.Builder，而不仅仅是Notification.Builder - 这可能是您遇到的第一个问题（您是否忽略了警告？）。您需要应用兼容 v7 和支持 v4 库。

其次，您不会看到通知。通知需要以下内容才能实际发布：

1. 内容标题
2. 内容文本
3. 内容意图
4. 小图标

要查看您的通知，请添加内容 Intent setContentIntent(PendingIntent.getActivity(context, 0, new Intent(), PendingIntent.FLAG_ONE_SHOT)) 和小图标 setSmallIcon(android.R.drawable.ic_notification_clear_all - 然后您就可以发布它了。

通过进行这些修改，您的代码对我有用。您还有其他一些问题，特别是完成后不会删除您的下载通知，但这就像将您的 notify(100 调用更改为 notify(0 一样简单，您传递的数字是通知 ID，所以他们如果它应该替换进度，则需要匹配。

我还没有修复你的内存泄漏，这是一个没有挂在你线程中的活动上下文的问题。