1. Android studio 2.0

Error:Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0

解决办法：http://stackoverflow.com/questions/35990995/com-android-dx-command-main-unsupported-major-minor-version-52-0

//    buildToolsVersion "24.0.0 rc3"
    buildToolsVersion "23.0.2"2. Manifests 权限已经设置，仍然有权限问题（Permission denied (missing INTERNET permission?)     ）

Permission denied (missing INTERNET permission?): But permission is given

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><application
    ...>
</application>

android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database

code：

try {
            String packageName="";//getPackageName();
            SQLiteDatabase.openOrCreateDatabase("/data/data/"+packageName+"/databases/test1.db", null);
            Log.v("killed", "DB created");
        } catch (Exception e) {
            Log.e("killed", "Create DB Error" + e.getMessage());
        }

permission：

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

出现这个问题，首先检查一下读写权限，发现权限没问题，一直这样的问题，在网上也查了许多，没有一个靠谱的。

最后才发现该db文件，只有在/data/data/packagename/目录下才有权限， 如果你出现这样的问题，只需要吧路径设置到相应app package下面

Details:

Order of defining tabs in Manifest:

1. Permissions
2. Applications
3. Receiver, Service, Metadata

3.AS 2.0 开启Instant Run出现的问题：Error:Access to the dex task is now impossible, starting with 1.4.0

Error:Access to the dex task is now impossible, starting with 1.4.0
1.4.0 introduces a new Transform API allowing manipulation of the .class files.
See more information: http://tools.android.com/tech-docs/new-build-system/transform-api

android老项目倒入后，android studio 2.0 自动更新gradle到2.0.0

http://blog.csdn.net/yzpbright/article/details/51231826

4. Android Fragment