我必须开发一个 android 应用程序，它的一项活动是：
- 检测新彩信
- 获取发件人号码以检查它是否是我想在我的应用程序中收到的号码
- 从彩信中获取（txt + 图像）
- 在 ListView 中显示 (Txt + Image) 数据
好吧，我找到了一个可以帮助我完成第二个和第三个任务的代码，但是我尝试了它并在我的手机上对其进行了测试，它可以工作，但是它没有检索到任何东西，只是黑色界面！！！
也许我不理解这段代码的某些部分的问题，
我在每个我无法理解的声明上方写了我的评论，请回答我在代码中的评论并帮助我理解我所缺少的希望早日得到你的回复。请清楚。
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.MessageFormat;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.app.Activity;
import android.os.Bundle;
public class MMSReceiverActivity extends Activity {
private final Uri CONTENT_URI_PART = Uri.parse("content://mms/part");
private static final String MSG_ID_STR = "mid=%1$s"; // I don't understand it
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Start Copying Code
// I don't know how can I retrieve mms id
long msg_id = this.getIntent().getLongExtra("msg_id", 0);
// What's different between ViewGroup and ListView
ViewGroup listview = (ViewGroup) findViewById(R.id.mmsdetaillist);
// What's different between "content://mms/part" and "content://mms/"
Cursor cursor = getContentResolver().query(CONTENT_URI_PART, null,
String.format(MSG_ID_STR, msg_id), null, null);
if (cursor.moveToFirst()) {
do {
// Why he puts partID
String partId = cursor.getString(cursor.getColumnIndex("_id"));
String type = cursor.getString(cursor.getColumnIndex("ct"));
if ("text/plain".equals(type)) {
String data = cursor.getString(cursor
.getColumnIndex("_data"));
String body;
// What's the different between if it's null or not all of
// them will return (text)
if (data != null) {
// implementation of this method below
body = getMmsText(partId);
} else {
body = cursor.getString(cursor.getColumnIndex("text"));
}
// Why he declared it like this i mean why it didn't declare
// like this findViewById (R.) etc
TextView t = new TextView(this);
t.setText(body);
listview.addView(t);
// Why here else ?? it should be only if because if MMS
// contains Text + img : so it'll ignore the (else = img)
// part !
} else if ("image/jpeg".equals(type)
|| "image/bmp".equals(type) || "image/gif".equals(type)
|| "image/jpg".equals(type) || "image/png".equals(type)) {
Bitmap bitmap = getMmsImage(partId);
ImageView iv = new ImageView(this);
iv.setImageBitmap(bitmap);
listview.addView(iv);
}
} while (cursor.moveToNext());
}
cursor.close();
}
public String getMmsText(String id) {
Uri partURI = Uri.parse("content://mms/part/" + id);
InputStream is = null;
StringBuilder sb = new StringBuilder();
try {
is = 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();
}
public Bitmap getMmsImage(String _id) {
Uri partURI = Uri.parse("content://mms/part/" + _id);
InputStream is = null;
Bitmap bitmap = null;
try {
is = getContentResolver().openInputStream(partURI);
bitmap = BitmapFactory.decodeStream(is);
} catch (IOException e) {
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
return bitmap;
}
}
注意：每次我搜索发送或接收彩信时，我都会得到这个链接，但直到现在我还没有得到它
我应该使用 repo 和 Git 吗？什么是 repo 和 Git？为什么要在彩信中使用？
我应该在发送和接收彩信时使用它吗？如果是，为什么？我可以用这个代码吗
content://mms-sms/conversations
而不是回购和git？