AsyncTask小结

AsyncTask小结

new AsyncTask<Void, Void, Void>() {

        @Override
        protected void onPreExecute() {
            mLoadingView.setVisibility(View.VISIBLE);
        }

        @Override
        protected Void doInBackground(Void... params) {

            mDatas = TrafficProvider.getTraffics(TrafficActivity.this);
            return null;
        }

        @Override
        protected void onProgressUpdate(Void... values) {

        }

        @Override
        protected void onPostExecute(Void result) {
            mLoadingView.setVisibility(View.GONE);

            mLv.setAdapter(new TrafficAdapter());
        }

    }.execute();

---

    // 加载进度条
    final ProgressDialog dialog = new ProgressDialog(this);
    dialog.setCancelable(false);
    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    SmsProvider.smsBackup(this, new OnSmsListener() {

        @Override
        public void onPre() {
            dialog.show();
        }

        @Override
        public void onProgress(int max, int progress) {
            dialog.setMax(max);
            dialog.setProgress(progress);
        }

        @Override
        public void onFinish(boolean success) {
            dialog.dismiss();
            if (success) {
                Toast.makeText(CommonToolActivity.this, "备份成功", 0).show();
            } else {
                Toast.makeText(CommonToolActivity.this, "备份失败", 0).show();
            }
        }

    });



public static void smsBackup(final Context context,
        final OnSmsListener listener) {
    new AsyncTask<Void, Integer, Boolean>() {

        @Override
        protected void onPreExecute() {
            if (listener != null) {
                listener.onPre();
            }
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            boolean flag = true;
            try {
                // 读短信,放到sd卡中
                ContentResolver cr = context.getContentResolver();

                Uri uri = Uri.parse("content://sms");
                String[] projection = { "address", "date", "read", "type",
                        "body" };
                String selection = null;
                String[] selectionArgs = null;
                String sortOrder = null;
                // select * from table where name = 'zs';
                Cursor cursor = cr.query(uri, projection, selection,
                        selectionArgs, sortOrder);
                // 放到list中
                List<SmsBean> list = new ArrayList<SmsBean>();
                if (cursor != null) {
                    int count = cursor.getCount();
                    int progress = 0;

                    publishProgress(count, progress);

                    while (cursor.moveToNext()) {
                        String address = cursor.getString(0);
                        long date = cursor.getLong(1);
                        int read = cursor.getInt(2);
                        int type = cursor.getInt(3);
                        String body = cursor.getString(4);

                        SmsBean bean = new SmsBean(address, date, read,
                                type, body);

                        list.add(bean);

                        publishProgress(count, ++progress);
                    }
                }

                cursor.close();

                // json到sd卡中
                Gson gson = new Gson();
                String json = gson.toJson(list);

                BufferedWriter bw = null;
                try {
                    bw = new BufferedWriter(new FileWriter(new File(
                            Environment.getExternalStorageDirectory(),
                            "sms.json")));
                    bw.write(json);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    StreamUtils.closeIO(bw);
                }
            } catch (Exception e) {
                flag = false;
            }

            return flag;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            Integer max = values[0];

            Integer progress = values[1];

            if (listener != null) {
                listener.onProgress(max, progress);
            }

        }

        @Override
        protected void onPostExecute(Boolean result) {
            if (listener != null) {
                listener.onFinish(result);
            }
        }
    }.execute();

}