ContentResolver.query()—>buildQueryString()

Cursor cursor = context.getContentResolver().query(Sms.CONTENT_URI,
        new String[]{"thread_id from sms where type = 3 group by thread_id—"},  // 可以这样使用。
        null, null, null);

07-17 10:55:17.084: E/AndroidRuntime(30157): FATAL EXCEPTION: main
07-17 10:55:17.084: E/AndroidRuntime(30157): java.lang.NullPointerException
07-17 10:55:17.084: E/AndroidRuntime(30157):     at com.txrj.sms.activity.ConversationListActivity$LoadThreadsExtra.run(ConversationListActivity.java:181)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at android.os.Handler.handleCallback(Handler.java:605)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at android.os.Looper.loop(Looper.java:137)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at android.app.ActivityThread.main(ActivityThread.java:4517)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at java.lang.reflect.Method.invokeNative(Native Method)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at java.lang.reflect.Method.invoke(Method.java:511)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
07-17 10:55:17.084: E/AndroidRuntime(30157):     at dalvik.system.NativeStart.main(Native Method)

---

Cursor cursor = context.getContentResolver().query(Sms.CONTENT_URI, 
        new String[]{"thread_id"},
        "type = 3 group by thread_id", null, null); // 不可以这样使用。

07-17 11:16:48.988: E/AndroidRuntime(32627): FATAL EXCEPTION: main
07-17 11:16:48.988: E/AndroidRuntime(32627): android.database.sqlite.SQLiteException: near "group": syntax error: , while compiling: SELECT thread_id FROM sms WHERE (type = 3 group by thread_id) ORDER BY date DESC
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:180)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:136)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.content.ContentProviderProxy.query(ContentProviderNative.java:358)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.content.ContentResolver.query(ContentResolver.java:311)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at com.txrj.sms.manager.SmsDataManager.getThreadsWithDraftMsg(SmsDataManager.java:33)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at com.txrj.sms.activity.ConversationListActivity$LoadThreadsExtra.run(ConversationListActivity.java:170)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.os.Handler.handleCallback(Handler.java:605)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.os.Looper.loop(Looper.java:137)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at android.app.ActivityThread.main(ActivityThread.java:4517)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at java.lang.reflect.Method.invokeNative(Native Method)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at java.lang.reflect.Method.invoke(Method.java:511)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
07-17 11:16:48.988: E/AndroidRuntime(32627):     at dalvik.system.NativeStart.main(Native Method)

---

Cursor cursor = context.getContentResolver().query(Sms.CONTENT_URI, 
        new String[]{"thread_id"},
        "type = 3", null, "thread_id desc group by thread_id"); // 不可以这样使用。
07-17 11:20:57.040: E/AndroidRuntime(940): FATAL EXCEPTION: main
07-17 11:20:57.040: E/AndroidRuntime(940): android.database.sqlite.SQLiteException: near "group": syntax error: , while compiling: SELECT thread_id FROM sms WHERE (type = 3) ORDER BY thread_id desc group by thread_id
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:180)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:136)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.content.ContentProviderProxy.query(ContentProviderNative.java:358)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.content.ContentResolver.query(ContentResolver.java:311)
07-17 11:20:57.040: E/AndroidRuntime(940):     at com.txrj.sms.manager.SmsDataManager.getThreadsWithDraftMsg(SmsDataManager.java:33)
07-17 11:20:57.040: E/AndroidRuntime(940):     at com.txrj.sms.activity.ConversationListActivity$LoadThreadsExtra.run(ConversationListActivity.java:170)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.os.Handler.handleCallback(Handler.java:605)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.os.Looper.loop(Looper.java:137)
07-17 11:20:57.040: E/AndroidRuntime(940):     at android.app.ActivityThread.main(ActivityThread.java:4517)
07-17 11:20:57.040: E/AndroidRuntime(940):     at java.lang.reflect.Method.invokeNative(Native Method)
07-17 11:20:57.040: E/AndroidRuntime(940):     at java.lang.reflect.Method.invoke(Method.java:511)
07-17 11:20:57.040: E/AndroidRuntime(940):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
07-17 11:20:57.040: E/AndroidRuntime(940):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
07-17 11:20:57.040: E/AndroidRuntime(940):     at dalvik.system.NativeStart.main(Native Method)

---

com.android.providers.telephony.SmsProvider.query(Uri, String[], String, String[], String)

SQLiteDatabase db = mOpenHelper.getReadableDatabase();
Cursor ret = qb.query(db, projectionIn, selection, selectionArgs,
                      null, null, orderBy);
-->

android.database.sqlite.SQLiteQueryBuilder.query(SQLiteDatabase, String[], String, String[], String, String, String)

public Cursor query(SQLiteDatabase db, String[] projectionIn,
        String selection, String[] selectionArgs, String groupBy,
        String having, String sortOrder) {
    return query(db, projectionIn, selection, selectionArgs, groupBy, having, sortOrder,
            null /* limit */);
}
-->

android.database.sqlite.SQLiteQueryBuilder.query(SQLiteDatabase, String[], String, String[], String, String, String, String)

public Cursor query(SQLiteDatabase db, String[] projectionIn,
        String selection, String[] selectionArgs, String groupBy,
        String having, String sortOrder, String limit) {
    if (mTables == null) {
        return null;
    }

    String sql = buildQuery(
            projectionIn, selection, selectionArgs, groupBy, having,
            sortOrder, limit);

    if (Log.isLoggable(TAG, Log.DEBUG)) {
        Log.d(TAG, "Performing query: " + sql);
    }
    return db.rawQueryWithFactory(
            mFactory, sql, selectionArgs,
            SQLiteDatabase.findEditTable(mTables));
}
-->

android.database.sqlite.SQLiteQueryBuilder.buildQuery(String[], String, String[], String, String, String, String)

public String buildQuery(
        String[] projectionIn, String selection, String[] selectionArgs,
        String groupBy, String having, String sortOrder, String limit) {
    String[] projection = computeProjection(projectionIn);

    StringBuilder where = new StringBuilder();
    boolean hasBaseWhereClause = mWhereClause != null && mWhereClause.length() > 0;

    if (hasBaseWhereClause) {
        where.append(mWhereClause.toString());
        where.append(')');
    }

    // Tack on the user's selection, if present.
    if (selection != null && selection.length() > 0) {
        if (hasBaseWhereClause) {
            where.append(" AND ");
        }

        where.append('(');
        where.append(selection);
        where.append(')');
    }

    return buildQueryString(
            mDistinct, mTables, projection, where.toString(),
            groupBy, having, sortOrder, limit);
}
-->

android.database.sqlite.SQLiteQueryBuilder.buildQueryString(boolean, String, String[], String, String, String, String, String)

public static String buildQueryString(
        boolean distinct, String tables, String[] columns, String where,
        String groupBy, String having, String orderBy, String limit) {
    if (TextUtils.isEmpty(groupBy) && !TextUtils.isEmpty(having)) {
        throw new IllegalArgumentException(
                "HAVING clauses are only permitted when using a groupBy clause");
    }
    if (!TextUtils.isEmpty(limit) && !sLimitPattern.matcher(limit).matches()) {
        throw new IllegalArgumentException("invalid LIMIT clauses:" + limit);
    }

    StringBuilder query = new StringBuilder(120);

    query.append("SELECT ");
    if (distinct) {
        query.append("DISTINCT ");
    }
    if (columns != null && columns.length != 0) {
        appendColumns(query, columns);
    } else {
        query.append("* ");
    }
    query.append("FROM ");
    query.append(tables);
   appendClause(query, " WHERE ", where);
    appendClause(query, " GROUP BY ", groupBy);
    appendClause(query, " HAVING ", having);
    appendClause(query, " ORDER BY ", orderBy);
    appendClause(query, " LIMIT ", limit);

    return query.toString();
}
-->

private static void appendClause(StringBuilder s, String name, String clause) {
    if (!TextUtils.isEmpty(clause)) {
        s.append(name);
        s.append(clause);
    }
}

---

class LoadThreadsExtra implements Runnable {
   
    List<Integer> draftIds = null;
    List<Integer> failIds = null;
    Map<Integer, Integer> unreadMap = null;
    Map<Integer, String> canonicalAddrMap = null;
    Map<String, String> nameAddrMap = null;

    @Override
    public void run() {
        draftIds = SmsDataManager.getThreadsWithDraftMsg(mContext);
        failIds = SmsDataManager.getThreadsWithFailedMsg(mContext);
        unreadMap = SmsDataManager.getThreadUnreadCountMap(mContext);
        canonicalAddrMap = SmsDataManager.getCanonicalAddressMap(mContext);
        nameAddrMap = SmsDataManager.getNameAddressMap(mContext);
       
        int threadCount = mThreads.size();
        for(int i=0;i<threadCount;i++){
            TxrjThreads thread = mThreads.get(i);
           long threadId = thread.getThreadId();
            thread.setHasDraftMsg(draftIds.contains(threadId)); // draftIds是Integer类型的列表，而threadId是long类型。决定不可能返回true！
            thread.setHasFailMsg(failIds.contains(threadId)); // 同上
            thread.setUnReadCount(unreadMap.containsKey(threadId) ? unreadMap.get(threadId) : 0); // 同上
            Log.i("txrjsms", "threadId:"+threadId+", hasDraftMsg:"+thread.isHasDraftMsg()
                    +", hasFailMsg:"+thread.isHasFailMsg()+", unread:"+thread.getUnReadCount());
        }
       
        mHandler.sendEmptyMessage(TxrjConstant.WHAT_NOTIFY_DATA_CHANGED);
    }
}

---

07-17 11:58:20.379: I/txrjsms(2402): show data in listview.
07-17 11:58:21.470: I/txrjsms(2402): threadId:455, hasDraftMsg:false, hasFailMsg:true, unread:1
07-17 11:58:21.470: I/txrjsms(2402): threadId:459, hasDraftMsg:true, hasFailMsg:true, unread:0
07-17 11:58:21.470: I/txrjsms(2402): threadId:457, hasDraftMsg:false, hasFailMsg:false, unread:0
07-17 11:58:21.470: I/txrjsms(2402): threadId:458, hasDraftMsg:false, hasFailMsg:false, unread:0
07-17 11:58:21.470: I/txrjsms(2402): threadId:456, hasDraftMsg:false, hasFailMsg:false, unread:0

---

点击某个会话跳转到信息列表界面，没有显示任何信息出来。

查看代码定位到产生bug的原因是getIntent().getIntExtra()无法获取到long类型的threadId。

ConversationListActivity.java

it.putExtra(TxrjConstant.EXTRA_THREAD_ID, thread.getThreadId());

MessageListActivity.java

mThreadId = getIntent().getIntExtra(TxrjConstant.EXTRA_THREAD_ID, -1);

将getIntExtra改成getLongExtra。如下。

mThreadId = getIntent().getLongExtra(TxrjConstant.EXTRA_THREAD_ID, -1);