android - 运行 Android 的问题（初学者！）

Question

我目前只是在关注创建 android 应用程序的教程（http://developer.android.com/training/basics/firstapp/building-ui.html）。我认为我遵循了所有说明，但似乎无法按照他们的说明运行提供的示例应用程序。这是eclipse提供的响应：

[2012-11-03 14:18:06 - My First App] ------------------------------
[2012-11-03 14:18:06 - My First App] Android Launch!
[2012-11-03 14:18:06 - My First App] adb is running normally.
[2012-11-03 14:18:06 - My First App] Performing com.example.my.first.app.MainActivity activity launch
[2012-11-03 14:18:06 - My First App] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'TestDevice1'
[2012-11-03 14:18:06 - My First App] Uploading My First App.apk onto device 'emulator-5554'
[2012-11-03 14:18:07 - My First App] Installing My First App.apk...
[2012-11-03 14:20:22 - My First App] Failed to install My First App.apk on device 'emulator-5554!
[2012-11-03 14:20:22 - My First App] (null)
[2012-11-03 14:20:22 - My First App] Launch canceled!
[2012-11-03 14:23:00 - My First App] ------------------------------
[2012-11-03 14:23:00 - My First App] Android Launch!
[2012-11-03 14:23:00 - My First App] adb is running normally.
[2012-11-03 14:23:00 - My First App] Performing com.example.my.first.app.MainActivity activity launch
[2012-11-03 14:23:00 - My First App] Automatic Target Mode: using existing emulator 
'emulator-5554' running compatible AVD 'TestDevice1'
[2012-11-03 14:23:00 - My First App] Uploading My First App.apk onto device 'emulator-5554'
[2012-11-03 14:23:01 - My First App] Installing My First App.apk...
[2012-11-03 14:25:24 - My First App] Failed to install My First App.apk on device 'emulator-5554!
[2012-11-03 14:25:24 - My First App] (null)
[2012-11-03 14:25:25 - My First App] Launch canceled!

有任何想法吗？

Answer 1

你在使用 Eclipse 吗？

您以前是否能够运行该程序？

如果您可以重新启动您的模拟器/计算机（请先尝试重新启动您的模拟器）。我曾经在一个蓝月亮中遇到过这个错误，只有重新启动用于解决它的计算机。

我还没弄清楚为什么会这样。

Answer 2

在我的情况下，它通过重新启动 Eclipse 并重新启动 Emulator 来工作！

试一试。

Answer 3

将项目的属性：Properties/Android/Project Build Target 更改为 Android 4.4.2 API 19，应用程序应该可以运行。