最近,我一直在做一个 Android 项目,需要我从 MMS 中获取文本。我对 Android 没有太多经验,但我熟悉 SQL 和 java,并且我一直在尽可能密切地关注这些帖子。
我想出的代码大部分都有效,但它似乎总是从第二条最近的 MMS 消息中获取文本,而不是最近的一条。知道为什么会发生这种情况吗?
以下是我使用前面提到的两个线程作为指南制作的 MMSReceiver 类的相关部分。
首先是onReceive方法... public class MMSReceiver extends BroadcastReceiver {
private static final String ACTION_MMS_RECEIVED = "android.provider.Telephony.WAP_PUSH_RECEIVED";
private static final String MMS_DATA_TYPE = "application/vnd.wap.mms-message";
private static String message;
@Override
public void onReceive(Context context, Intent intent) {
Log.d("Test" , "MMSReceiver!");
Uri uri = Uri.parse("content://mms-sms/conversations");
String action = intent.getAction();
String type = intent.getType();
//Log.d("MMS", "action is " + action + " , type is " + type);
final Context cont = context;
ContentResolver cr = context.getContentResolver();
final String[] projection = new String[]{"*"};
Uri MMSuri = Uri.parse("content://mms/inbox/");
Cursor MmsIDquery = cr.query(uri, projection, null, null, null);
MmsIDquery.moveToFirst();
String mid = MmsIDquery.getString(MmsIDquery.getColumnIndex("_id"));
Log.d("MMS", "message id for unreadable message is " + mid);
message = getMessageText(cont, mid);
...
getMessageText 方法传递上下文和消息 id,并写成这样......
/* gets message text */
public String getMessageText(Context context, String mmsid){
Log.d("MMS", "mmsid was " + mmsid);
String message = null;
String mid = ""+(Integer.parseInt(mmsid)+2);
Log.d("MMS", "mmsid is now " + mid);
String selectionPart = "mid=" + mmsid;
Uri mmsTextUri = Uri.parse("content://mms/part");
Cursor cursor = context.getContentResolver().query(mmsTextUri, null, selectionPart, null, null);
if (cursor.moveToFirst()){
do{
String partId = cursor.getString(cursor.getColumnIndex("_id"));
String type = cursor.getString(cursor.getColumnIndex("ct"));
Log.d("MMS", "getMessageText was called, partId = " + partId + " , type = " + type);
if ("text/plain".equals(type)){
String data = cursor.getString(cursor.getColumnIndex("_data"));
Log.d("MMS", "data was " + data);
if (data != null){
message = getMmsText(context, partId);
Log.d("MMS", "body was " + message);
} else {
message = cursor.getString(cursor.getColumnIndex("text"));
Log.d("MMS", "body was " + message);
}
}
} while (cursor.moveToNext());
} else {
Log.d("MMS", "Query returned nothing in getMessageText()");
}
return message;
}
在此方法中,调用 getMmsText。我意识到这个过程有点多余,但是我很难理解这个过程中发生的所有事情,所以我尽可能地保持它与原始线程相似,以确保问题不存在以我为自己的代码减少它的方式。
getMmsText 看起来像这样......
public String getMmsText(Context c, String id){
Log.d("MMS", "getMmsText was called with " + id);
Uri partUri = Uri.parse("content://mms/inbox/" + id);
InputStream is = null;
StringBuilder sb = new StringBuilder();
try{
is = c.getContentResolver().openInputStream(partUri);
if (is != null){
InputStreamReader isr = new InputStreamReader(is, "UTF-8");
BufferedReader reader = new BufferedReader(isr);
String temp = reader.readLine();
while(temp != null){
sb.append(temp);
temp = reader.readLine();
}
}
} catch (IOException e){}
finally {
if (is != null){
try{
is.close();
} catch (IOException e){}
}
}
return sb.toString();
}
非常感谢您的帮助,如果您有任何问题可以帮助您回答,请告诉我。