Android Intent 检查/查看电子邮件

Question

我正在寻找一种方法来从我的应用程序中触发设备上的电子邮件应用程序以检查电子邮件。注意:我不想“发送”任何电子邮件，只想“查看”电子邮件。 gmail 应用程序的以下代码崩溃 -

          Intent intent = new Intent(Intent.ACTION_VIEW);
          intent.setType("message/rfc822");
          startActivity(intent);

堆栈跟踪是 -

06-06 23:26:20.313 27703-27731/? E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
                                                   Process: com.google.android.gm, PID: 27703
                                                   java.lang.RuntimeException: An error occurred while executing doInBackground()
                                                       at android.os.AsyncTask$3.done(AsyncTask.java:309)
                                                       at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
                                                       at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
                                                       at java.util.concurrent.FutureTask.run(FutureTask.java:242)
                                                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                                                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                       at java.lang.Thread.run(Thread.java:818)
                                                    Caused by: java.lang.NullPointerException: uri
                                                       at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:60)
                                                       at android.content.ContentResolver.openInputStream(ContentResolver.java:645)
                                                       at clk.a(SourceFile:8)
                                                       at clk.loadInBackground(SourceFile:74)
                                                       at android.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:312)
                                                       at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:69)
                                                       at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:66)
                                                       at android.os.AsyncTask$2.call(AsyncTask.java:295)
                                                       at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                                                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
                                                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
                                                       at java.lang.Thread.run(Thread.java:818) 

有没有办法只为了查看电子邮件而启动电子邮件应用程序？

Answer 1

您可以使用 makeMainSelectorActivity 执行此操作来自 Intent 的方法类。

Intent intent = Intent.makeMainSelectorActivity(
                     Intent.ACTION_MAIN,
                     Intent.CATEGORY_APP_EMAIL);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(Intent.createChooser(intent, "Email"));

Intent makeMainSelectorActivity (String selectorAction, 字符串选择器类别)

Make an Intent for the main activity of an application, without specifying a specific activity to run but giving a selector to find the activity. This results in a final Intent that is structured the same as when the application is launched from Home. For anything else that wants to launch an application in the same way, it is important that they use an Intent structured the same way, and can use this function to ensure this is the case.

CATEGORY_APP_EMAIL