下午研究了很久都没有找到如何在managedQuery方法里面加入group by 条件最后灵机一动!
想出了一个及其猥琐的方法解决此问题!
此时我的需求是查出Calllog中的号码!相同的自然只出一个结果!
正常的查询是这样的!
Cursor phoneCursor = this.managedQuery(CallLog.Calls.CONTENT_URI ,
new String[] { CallLog.Calls.NUMBER,
CallLog.Calls.CACHED_NAME, CallLog.Calls.TYPE },
null, null, CallLog.Calls.DEFAULT_SORT_ORDER);
phoneCursor.moveToFirst();
while (phoneCursor.getPosition() != phoneCursor.getCount()) {
String number = phoneCursor.getString(phoneCursor
.getColumnIndexOrThrow(CallLog.Calls.NUMBER));
String name = phoneCursor.getString(phoneCursor
.getColumnIndexOrThrow(CallLog.Calls.CACHED_NAME));
Log.e(TAG, "name:" + name + "number:" + number);
phoneCursor.moveToNext();
}
此方法达不到过滤号码相同的!
于是首先想到的要过滤这个最好只在查询的时候就做查出结果后在遍历肯定效率存在问题!
但managedQuery貌似没有提供group by的入口!
首先想到的是在where 子句的入口
Cursor phoneCursor = this.managedQuery(CallLog.Calls.CONTENT_URI ,
new String[] { CallLog.Calls.NUMBER,
CallLog.Calls.CACHED_NAME, CallLog.Calls.TYPE },
"group by CallLog.Calls.NUMBER", null, CallLog.Calls.DEFAULT_SORT_ORDER);
错误出现了
01-08 09:08:25.380: ERROR/DatabaseUtils(334): Writing exception to parcel
01-08 09:08:25.380: ERROR/DatabaseUtils(334): android.database.sqlite.SQLiteException: near "group": syntax error: , while compiling: SELECT number, name, type FROM calls WHERE (group by CallLog.Calls.NUMBER) ORDER BY date DESC
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1345)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:330)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at com.android.providers.contacts.CallLogProvider.query(CallLogProvider.java:130)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.content.ContentProvider$Transport.bulkQuery(ContentProvider.java:150)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:111)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at android.os.Binder.execTransact(Binder.java:288)
01-08 09:08:25.380: ERROR/DatabaseUtils(334): at dalvik.system.NativeStart.run(Native Method)
01-08 09:08:25.390: WARN/dalvikvm(1347): threadid=1: thread exiting with uncaught exception (group=0x40020800)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): FATAL EXCEPTION: main
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): android.database.sqlite.SQLiteException: near "group": syntax error: , while compiling: SELECT number, name, type FROM calls WHERE (group by CallLog.Calls.NUMBER) ORDER BY date DESC
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:158)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:114)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.content.ContentProviderProxy.bulkQueryInternal(ContentProviderNative.java:330)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.content.ContentProviderProxy.query(ContentProviderNative.java:366)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.content.ContentResolver.query(ContentResolver.java:245)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.app.Activity.managedQuery(Activity.java:1520)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at com.test.CopyOfTests.onClick(CopyOfTests.java:68)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.view.View.performClick(View.java:2408)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.view.View$PerformClick.run(View.java:8816)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.os.Handler.handleCallback(Handler.java:587)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.os.Handler.dispatchMessage(Handler.java:92)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.os.Looper.loop(Looper.java:123)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at java.lang.reflect.Method.invokeNative(Native Method)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at java.lang.reflect.Method.invoke(Method.java:521)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
01-08 09:08:25.390: ERROR/AndroidRuntime(1347): at dalvik.system.NativeStart.main(Native Method)
看到这个错误后我很猥琐的想到了黑客的方法
现在的查询语句是
SELECT number, name, type FROM calls WHERE (group by CallLog.Calls.NUMBER) ORDER BY date DESC
吧它改装一下
SELECT number, name, type FROM calls WHERE (1=1)group by CallLog.Calls.NUMBER () ORDER BY date DESC
后面那个()会出现错误那我一不做二不休
SELECT number, name, type FROM calls WHERE (1=1) group by number --() ORDER BY date DESC
于是我成了的加入了group by查询
Cursor phoneCursor = this.managedQuery(CallLog.Calls.CONTENT_URI ,
new String[] { CallLog.Calls.NUMBER,
CallLog.Calls.CACHED_NAME, CallLog.Calls.TYPE },
"1=1) group by "+CallLog.Calls.NUMBER+" -- (", null, CallLog.Calls.DEFAULT_SORT_ORDER);
分享到:
相关推荐
Android开发获取相册图片的方式网上有很多种,这里说一个Android4.4后的方法,因为版本越高,一些老的api就会被弃用,新的api和老的api不兼容,导致出现很多问题。 比如:managedQuery()现在已经被...
查询数据会比较耗时,所以我们想把查询数据放在一个异步任务中,查询结果获得Cursor,然后在onPostExecute (Cursor result)方法中设置Adapter,我们可能会想到使用Activity的managedQuery来生成Cursor,这样Cursor就...
本文实例讲述了android实现Uri获取真实路径转换成File的方法。分享给大家供大家参考。具体实现方法如下: Uri uri = data.getData(); String[] proj = { MediaStore.Images.Media.DATA }; Cursor actualimagecursor...
Android contact通讯录实例,比较不错的例子,来自书中的完整实例,Android手机读取联系人信息、显示、保存、编辑联系人,多卡同时读取联系人等,涉及要点:删除指定数据列、URI类型转换、插入数据、查询数据、更新...
尽管这种查询字符串格式很常见 但是它看起来还是有点令人迷惑 为此 Android提供一系列的帮助类(在android provider包下) 里面包含了很多以类变量形式给出的查询字符串 这种方式更容易让我们理解一点 因此 如上面...
Cursor c = managedQuery(uri, projection, null, null, null); // 实例化桌号下拉列表Spinner的Adapter SimpleCursorAdapter adapter2 = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item,...