android 定时请求（两种实现方式）

方式一： Handler + Runnable （借鉴网址：http://stackoverflow.com/questions/6207362/how-to-run-an-async-task-for-every-x-mins-in-android

    private final static int INTERVAL = 1000;  // 2 minutes
    private static final int ALL_COUNT = 5;    // 总资源数
    private TextView mTextView;
    private ProgressBar mProgressBar;
    
    private Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            mProgressBar.setProgress(msg.what);
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView) this.findViewById(R.id.textView1);
        mProgressBar = (ProgressBar) this.findViewById(R.id.progressBar2);
        startRepeatingTask();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    Runnable m_handlerTask = new Runnable() {
        @Override
        public void run() {
            int count = doSomething();
            if (count <= ALL_COUNT) {
                mHandler.sendEmptyMessage((int) ((count / (float) ALL_COUNT)*100));
                mHandler.postDelayed(m_handlerTask, INTERVAL);
            } else {
                stopRepeatingTask();
            }
        }
    };

    private int mCount = -1;
    /**
     * 此处调用 接口
     * @return
     */
    private int doSomething() {
        mCount = mCount + 1;
        return mCount;
    }

    void startRepeatingTask() {
        m_handlerTask.run();
    }

    /**
     * 此处 结束
     */
    void stopRepeatingTask() {
        mTextView.setText("合成完成！");
        mHandler.removeCallbacks(m_handlerTask);
    }

方式二：AsyncTask

    private TextView mTextView;
    private ProgressBar mProgressBar;
    private SynthesisProgressTask mSynthesisProgressTask;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView) this.findViewById(R.id.textView1);
        mProgressBar = (ProgressBar) this.findViewById(R.id.progressBar2);
        mSynthesisProgressTask = new SynthesisProgressTask(mProgressBar, mTextView);
        mSynthesisProgressTask.execute("url");
    }

        @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

        private class SynthesisProgressTask extends AsyncTask<String, Integer, Integer> {
        private static final int ALL_MEDIA_COUNT = 10;
        private boolean isSynthesisFinished = false;
        private ProgressBar mInnerProgressBar;
        private TextView mInnerTextView;

        public SynthesisProgressTask(ProgressBar progressBar, TextView textView) {
            this.mInnerProgressBar = progressBar;
            this.mInnerTextView = textView;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected Integer doInBackground(String... params) {
            int i = -1;
            while (!isSynthesisFinished) {
                synchronized (this) {
                    i = i + 1;
                    if (i == ALL_MEDIA_COUNT) {
                        isSynthesisFinished = true;
                    }
                    publishProgress((int) ((i / (float) ALL_MEDIA_COUNT) * 100));
                    try {
                        wait(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
            return i;
        }

        @Override
        protected void onPostExecute(Integer result) {
            super.onPostExecute(result);
            mInnerTextView.setText("已完成！");
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            System.out.println("onSynth onProgress : " + values[0]);
            mInnerProgressBar.setProgress(values[0]);
            mInnerTextView.setText(values[0] + "%");
        }

    }