如何用 Java Android 从外部 IP 发起 ping?
此示例演示了如何使用 java android 从外部 IP 发起 ping。
步骤 1 - 在 Android Studio 中创建一个新项目,转到文件 ⇒ 新项目并填写所有必需的详细信息以创建一个新项目。
步骤 2 - 将以下代码添加到 res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> </android.support.constraint.ConstraintLayout>
步骤 3 - 将以下代码添加到 src/MainActivity.java
import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.Toast; import java.io.IOException; public class MainActivity extends AppCompatActivity { Boolean isConnected = false, isWiFi = false, isMobile = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); if (activeNetwork != null) { isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI; isMobile = activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE; isConnected = activeNetwork.isConnectedOrConnecting(); } if (isConnected) { if (isWiFi) { Toast.makeText(this, "Yes, WiF", Toast.LENGTH_SHORT) .show(); if(isConnectedToThisServer("https://www.google.com/")) { Toast.makeText(this, "Yes, Connected to Google", Toast.LENGTH_SHORT) .show(); } else { Toast.makeText(this, "No Google Connection", Toast.LENGTH_SHORT) .show(); } } if (isMobile) { Toast.makeText(this, "Yes, Mobile", Toast.LENGTH_SHORT) .show(); if(isConnectedToThisServer("https://www.google.com/")) { Toast.makeText(this, "Yes, Connected to Google", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "No Google Connection", Toast.LENGTH_SHORT).show(); } } } else { Toast.makeText(this, "No Network", Toast.LENGTH_SHORT).show(); } } public boolean isConnectedToThisServer(String host) { Runtime runtime = Runtime.getRuntime(); try { Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8" + host); int exitValue = ipProcess.waitFor(); return (exitValue == 0); } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } return false; } }
步骤 4 - 将以下代码添加到 androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将实际的 Android 移动设备与您的计算机连接。要从 Android Studio 运行应用程序,请打开一个项目活动文件,点击工具栏上的运行 图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 -
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