如何在MainActivity中，ping需要的IP地址，降丢包率信息显示在 TextView 中

您可以使用以下代码在 MainActivity 中 ping 指定的 IP 地址，并将丢包率信息显示在 TextView 中：

public class MainActivity extends AppCompatActivity {
    private TextView mTextView;

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

        mTextView = findViewById(R.id.text_view);

        String ipAddress = "192.168.1.1"; // 指定的 IP 地址
        try {
            Process process = Runtime.getRuntime().exec("/system/bin/ping -c 4 " + ipAddress);
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            int packetsSent = 0;
            int packetsReceived = 0;
            String line;
            while ((line = reader.readLine()) != null) {
                if (line.contains("packets transmitted")) {
                    packetsSent = Integer.parseInt(line.split(" ")[0]);
                } else if (line.contains("packets received")) {
                    packetsReceived = Integer.parseInt(line.split(" ")[0]);
                } else if (line.contains("packet loss")) {
                    String[] parts = line.split(", ");
                    String packetLoss = parts[2].split("%")[0];
                    mTextView.setText("丢包率：" + packetLoss + "%");
                }
            }
            reader.close();
            process.destroy();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

请注意，您需要在 AndroidManifest.xml 文件中添加以下权限：

<uses-permission android:name="android.permission.INTERNET" />