Question

我正在Android中练习，我想显示ping的值。我按照现有的答案（this topic）。事实是，这个人提供的代码并没有显示任何信息（我为了测试函数的返回值而烦恼它＃34; ping＆＃34;）。我这样称呼函数：

Toast.makeText(getApplicationContext(), ping("http://www.stackoverflow.com"), Toast.LENGTH_SHORT).show();

任何其他类型的代码只是显示ping值？

我确定我的代码没有任何其他进程，我只想最终在一个小的textView中显示这个结果。

这是我的代码。

MainActivity.java

private String ping(String url) {

    String str = "";

    try {
        Process process = Runtime.getRuntime().exec(
                "/system/bin/ping -c 8 " + url);
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                process.getInputStream()));
        int i;
        char[] buffer = new char[4096];
        StringBuffer output = new StringBuffer();
        while ((i = reader.read(buffer)) > 0)
            output.append(buffer, 0, i);
        reader.close();

        // body.append(output.toString()+"\n");
        str = "ping : " + output.toString();
        // Log.d(TAG, str);
    } catch (IOException e) {
        // body.append("Error\n");
        e.printStackTrace();
    }

    return str;
}

private Button button;
private TextView textView;

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

    textView = (TextView) findViewById(R.id.textView);
    button = (Button) findViewById(R.id.button);

    toggleButton.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            Toast.makeText(getApplicationContext(), ping("http://www.stackoverflow.com"), Toast.LENGTH_SHORT).show();
            });                     
    }); }

Answer 1

yourTextView.setText(ping("http://www.stackoverflow.com"));

Answer 2

尝试类似这样的内容：Android- Unstable, slow, unreliable PING

public class NameOfYourActivity

之后

// you need to define this value here, you will need it between "voids", "booleans", ...
long timeofping;

<强> OnCreate中：

// button on click listener
Button clickMyButton = (Button)findViewById(R.id.button);
clickFirstButton.setOnClickListener(new View.OnClickListener() {
    @Override
        public void onClick(View v) {
            // launch the ping process in a separate thread
            // beacuse of the stability of the app
            new Thread(ping).start();
        }
});

方法“onCreate”后

// this code runs after the code bellow ("public Runnable ping ...")
void setPingResult(long pingtime) {
    Toast.makeText(getApplicationContext(), timeofping + " milliseconds", Toast.LENGTH_LONG).show();
}



// thread of "ping" process
public Runnable ping = new Runnable() {
        @Override
        public void run() {
            Runtime runtime = Runtime.getRuntime();
            try {
                long a = System.currentTimeMillis() % 1000;
                Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
                ipProcess.waitFor();
                timeofping = System.currentTimeMillis() % 1000 - a;
            } catch (IOException e)          { e.printStackTrace(); }
            catch (InterruptedException e) { e.printStackTrace(); }

            // update the ping result - we need to call this on the UI thread 
            // because it updates UI elements (TextView)
            runOnUiThread(new Runnable() {
            public void run() {
                setPingResult(timeofping);
            }
        });

    }
}

如果有任何错误，请修理我！别忘了“进口”！（等import android.widget.Toast;）

Answer 3

发现我的错误：需要使用8.8.4.4之类的IP地址代替域地址行www.google.com。可能需要DNS权限吗？

如何获得ping值android

3 个答案: