Question

以下是计算总带宽消耗量的代码（值每秒更新和增加）。但是，我希望它计算网络速度，这可以通过每秒从新的减去先前的值来实现。我如何实现这一目标？

public class Browser extends Activity {

    private WebView mWebView;
    private Handler mHandler = new Handler();
    private long mStartRX = 0;
    private long mStartTX = 0;

    private final Runnable mRunnable = new Runnable() {
        public void run() {
            calculate();
            mHandler.postDelayed(mRunnable, 1000);
        }
    };

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

        mWebView = (WebView) findViewById(R.id.webView1);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.setWebViewClient(new MyWebViewClient());
        mWebView.loadUrl("http://www.google.com");
        //
        mStartRX = TrafficStats.getTotalRxBytes();
        mStartTX = TrafficStats.getTotalTxBytes();
        if (mStartRX == TrafficStats.UNSUPPORTED
                || mStartTX == TrafficStats.UNSUPPORTED) {
            AlertDialog.Builder alert = new AlertDialog.Builder(this);
            alert.setTitle("Uh Oh!");
            alert.setMessage("Your device does not support traffic stat monitoring.");
            alert.show();

        } else {
            mHandler.postDelayed(mRunnable, 1000);

        }
        //
    }

    private class MyWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

        @Override
        // Loading Spinner and status
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            findViewById(R.id.pb3).setVisibility(View.VISIBLE);
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            findViewById(R.id.pb3).setVisibility(View.GONE);
        }
    };

    public void reload(View view) { // Reload Button
        mHandler.removeCallbacks(mRunnable);
        mHandler.postDelayed(mRunnable, 1000);

        TextView RX = (TextView) findViewById(R.id.RX);
        TextView TX = (TextView) findViewById(R.id.TX);
        TX.setText(TrafficStats.getTotalRxBytes() + "");
        RX.setText(TrafficStats.getTotalRxPackets() + "");
        android.webkit.CookieManager.getInstance().removeAllCookie();
        mWebView.reload();
    }

    private void calculate() {
        TextView RX = (TextView) findViewById(R.id.RX);
        TextView TX = (TextView) findViewById(R.id.TX);
        // long rxBytes = TrafficStats.getTotalRxBytes() - mStartRX;
        // RX.setText(Long.toString(rxBytes));
        long rxBytes = TrafficStats.getTotalRxBytes() - mStartRX;
        RX.setText(Long.toString(rxBytes) + " bytes");
        if (rxBytes >= 1024) {
            // KB or more
            long rxKb = rxBytes / 1024;
            RX.setText(Long.toString(rxKb) + " KBs");
            if (rxKb >= 1024) {
                // MB or more
                long rxMB = rxKb / 1024;
                RX.setText(Long.toString(rxMB) + " MBs");
                if (rxMB >= 1024) {
                    // GB or more
                    long rxGB = rxMB / 1024;
                    RX.setText(Long.toString(rxGB));
                }// rxMB>1024
            }// rxKb > 1024
        }// rxBytes>=1024

        // long txBytes = TrafficStats.getTotalTxBytes() - mStartTX;
        // TX.setText(Long.toString(txBytes));
        long txBytes = TrafficStats.getTotalTxBytes() - mStartTX;
        TX.setText(Long.toString(txBytes) + " bytes");
        if (txBytes >= 1024) {
            // KB or more
            long txKb = txBytes / 1024;
            TX.setText(Long.toString(txKb) + " KBs");
            if (txKb >= 1024) {
                // MB or more
                long txMB = txKb / 1024;
                TX.setText(Long.toString(txMB) + " MBs");
                if (txMB >= 1024) {
                    // GB or more
                    long txGB = txMB / 1024;
                    TX.setText(Long.toString(txGB));
                }// rxMB>1024
            }// rxKb > 1024
        }// rxBytes>=1024

    }

    @Override
    public void onBackPressed() {
        Intent intent = new Intent(this, Advanced.class);
        startActivity(intent);
        intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
        startActivityForResult(intent, 0);
        overridePendingTransition(0, 0); // 0 for no animation
    }
}

Answer 1

使用两个全局变量来存储最后收到的数据。

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从新的一个android中减去旧字符串

1 个答案: