Android issues

1. Android studio 2.0

 

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

 

解決辦法：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 權限已經設置，仍然有權限問題（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" />

 

出現這個問題，首先檢查一下讀寫權限，發現權限沒問題，一直這樣的問題，在網上也查了許多，沒有一個靠譜的。

最後才發現該db文件，只有在/data/data/packagename/目錄下才有權限， 若是你出現這樣的問題，只須要吧路徑設置到相應app package下面

 

Details:

Order of defining tabs in Manifest:

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

3.AS 2.0 開啓Instant Run出現的問題：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老項目倒入後，android studio 2.0 自動更新gradle到2.0.0

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

 

4. Android Fragment 

The method add(Fragment,String ) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment)

import issue, 

今天遇到這樣一個很奇葩的錯誤信息，後來查到我導入的包有問題  import android.app.Fragment;
import android.app.FragmentManager;   其實我應該使用的是  import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;   而後本身查看了一下API兩者差異仍是蠻大的   import android.app.Fragment 只能在API版本大於11的時候使用   而不包含getFragmentManager() 和 getSupportFragmentManager()  兩個方法的   雖然在代碼這樣寫不會報錯的  可是  replace(int, Fragment, String)執行的時候會一直出現錯誤   提示上面那個錯誤信息

 

5. Error:(100, 43) error: package R does not exist

import yourpackage.R

 

6.  android.content.res.Resources$NotFoundException: String resource ID #0x1

今天使用TextView的setText方法遇到這個錯誤，原來是傳入text的是int類型的，android不能自動轉換成string類型，直接跑出這樣的異常，我也是醉了

 

7. Android listview set on click item listener doesn't work

Item Layout的根控件設置其Android:descendantFocusability=」blocksDescendants」便可

 

 

8 include exception

 You must specifiy a layout in the include tag: <include layout="@layout/layoutID" />

layout.xml

android:layout=" xxx"

remove android