如何（从本机代码）将android.content.Context参数发送到Java fct（通过JNI）

我正在为我的android手机开发一个应用程序，我正在尝试启用Wifi热点。 我使用Qt5.4.1，所以我在C++中开发。 由于NDK中没有任何函数可以执行此操作，因此我使用JNI调用Java方法

我的java代码是（感谢Ashish Sahu在中的回答）：

C++代码示例：

setWifiApEnabled(QAndroidJniObject context, bool b)
{
    return QAndroidJniObject::callStaticMethod<jboolean>("org/app/test/ApManager"
                                                         , "configApState"
                                                         , "(Ljava/lang/Object;Z)Z" //Or (Landroid/content/Context;Z)Z ???
                                                         , context.object<jobject>()
                                                         , b);
}

appctx

有效，但Wifi热点未启用，我无法获取其状态

---

编辑2:：我使用Android Studio成功地启用了java中的Wifi热点。代码如下：

WifiApManager.java：

public class WifiApManager {
    private WifiManager wifiMan;
    protected Method setWifiApEnabledMethod, isWifiApEnabledMethod;
    protected final static int MAX_ITER = 10;

    public WifiApManager(WifiManager wifiMan) {
        this.wifiMan = wifiMan;
        getHiddenMethods();
    }

    private void getHiddenMethods() {
        try {
            setWifiApEnabledMethod = wifiMan.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
            isWifiApEnabledMethod = wifiMan.getClass().getMethod("isWifiApEnabled");
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
    }

    public boolean isWifiApEnabled() {
        try {
            return (Boolean)isWifiApEnabledMethod.invoke(wifiMan);
        } catch (Exception e) {
            return false;
        }
    }

    public boolean isWifiEnabled() {
        return wifiMan.isWifiEnabled();
    }

    public boolean setWifiApEnabled(WifiConfiguration conf, boolean enabled) {
        try {
            return (Boolean) setWifiApEnabledMethod.invoke(wifiMan, conf, true);
        } catch (Exception e) {
            return false;
        }
    }

    public boolean toggleWifi(String ssid) {
        // WifiConfiguration creation:
        WifiConfiguration conf = new WifiConfiguration();
        conf.SSID = ssid;
        conf.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);

        // If AP Wifi is enabled, disables it and returns:
        if(isWifiApEnabled()) {
            //setWifiApEnabled(null, false); Won't work, see two further lines
            wifiMan.setWifiEnabled(true);
            wifiMan.setWifiEnabled(false);
            int maxIter = MAX_ITER;
            while (isWifiApEnabled() && maxIter-- >= 0) {
                try {Thread.sleep(500);} catch (Exception e) {}
            }
            return isWifiApEnabled();
        }

        // If standard Wifi is enabled, disables it:
        if (isWifiEnabled()) {
            if (wifiMan.setWifiEnabled(false)) {
                int maxIter = MAX_ITER;
                while (wifiMan.isWifiEnabled() && maxIter-- >= 0) {
                    try {Thread.sleep(500);} catch (Exception e) {}
                }
            }
            if (isWifiEnabled()) {
                return false;
            }
        }

        // Enables AP Wifi
        try {
            if (! setWifiApEnabled(conf, true)) {
                System.out.println("setWifiApEnabledMethod failed.");
                return false;
            }
            int maxIter = MAX_ITER;
            while (! isWifiApEnabled() && maxIter-- > 0) {
                try {Thread.sleep(500);} catch (Exception e) {}
            }
        } catch(Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
}

主要类别：

public class AndroidMenusActivity extends Activity implements OnClickListener {
    private WifiApManager wifiMan;
    private ToggleButton wifiButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        wifiMan = new WifiApManager((WifiManager) this.getSystemService(Context.WIFI_SERVICE));
        setContentView(R.layout.activity_android_menus);
        makeUI();
    }

    private void makeUI() {
        LinearLayout subLayout = (LinearLayout) findViewById(R.id.subLayout);
        wifiButton = new ToggleButton(this);
        wifiButton.setTextOn("Disable Wifi");
        wifiButton.setTextOff("Enable AP Wifi");
        wifiButton.setChecked(wifiMan.isWifiApEnabled());
        wifiButton.setOnClickListener(this);
        subLayout.addView(wifiButton);
    }

    @Override
    public void onClick(View sender) {
        if (!wifiButton.equals(sender))
            return;

        AsyncTask<Object, Void, Boolean> task = new AsyncTask<Object, Void, Boolean>() {
            private ToggleButton bt;
            private WifiApManager wm;

            @Override
            protected Boolean doInBackground(Object... args) {
                bt = (ToggleButton) args[0];
                wm = (WifiApManager) args[1];
                return wm.toggleWifi("test.com");
            }
            @Override
            protected void onPostExecute (Boolean result) {
                bt.setChecked(result.booleanValue());
                bt.setEnabled(true);
            }
        };
        wifiButton.setEnabled(false);
        task.execute(wifiButton, wifiMan);
    }
}

公共类AndroidMenusActivity扩展活动实现OnClickListener{
私人WifiApManager wifiMan；
私人开关按钮；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
wifiMan=newwifipmanager（（WifiManager）this.getSystemService（Context.WIFI_SERVICE））；
setContentView（R.layout.activity\u android\u菜单）；
makeUI（）；
}
私有void makeUI（）{
线性布局子布局=（线性布局）findViewById（R.id.subLayout）；
wifiButton=新的切换按钮（此按钮）；
setexton（“禁用Wifi”）；
wifiButton.setTextOff（“启用AP Wifi”）；
wifiButton.setChecked（wifiMan.isWifiApEnabled（））；
setOnClickListener（this）；
子布局。添加视图（wifiButton）；
}
@凌驾
公共void onClick（查看发件人）{
如果（！wifiButton.equals（发送方））
返回；
AsyncTask任务=新建AsyncTask（）{
专用切换按钮bt；
私人WifiApManager wm；
@凌驾
受保护的布尔doInBackground（对象…args）{
bt=（切换按钮）参数[0]；
wm=（WifiApManager）参数[1]；
返回wm.toggleWifi（“test.com”）；
}
@凌驾
受保护的void onPostExecute（布尔结果）{
bt.setChecked（result.booleanValue（））；
bt.setEnabled（真）；
}
};
wifiButton.setEnabled（false）；
执行（wifiButton，wifiMan）；
}
}

---

<>但是在C++中，我找不到一个方法，任何帮助？< /p> < P>只是为了将上下文对象从C++传递到JNI，使用自动注入方式：

QtAndroid::androidActivity().callStaticMethod<void>(
      "com/company/project/MyApp",
      "myFunc", // method name
      "(Landroid/content/Context;)V" // auto-injection
    );

QtAndroid:：androidActivity（）.callStaticMethod(
“com/company/project/MyApp”，
“myFunc”，//方法名称
“（Landroid/content/Context；）V”//auto-injection
);

我刚刚编辑了我的问题我成功地使用Java和Android Studio启用了Wifi热点，我编辑了我的问题以添加代码。有没有人知道如何用C++来做同样的事情？

public class AndroidMenusActivity extends Activity implements OnClickListener {
    private WifiApManager wifiMan;
    private ToggleButton wifiButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        wifiMan = new WifiApManager((WifiManager) this.getSystemService(Context.WIFI_SERVICE));
        setContentView(R.layout.activity_android_menus);
        makeUI();
    }

    private void makeUI() {
        LinearLayout subLayout = (LinearLayout) findViewById(R.id.subLayout);
        wifiButton = new ToggleButton(this);
        wifiButton.setTextOn("Disable Wifi");
        wifiButton.setTextOff("Enable AP Wifi");
        wifiButton.setChecked(wifiMan.isWifiApEnabled());
        wifiButton.setOnClickListener(this);
        subLayout.addView(wifiButton);
    }

    @Override
    public void onClick(View sender) {
        if (!wifiButton.equals(sender))
            return;

        AsyncTask<Object, Void, Boolean> task = new AsyncTask<Object, Void, Boolean>() {
            private ToggleButton bt;
            private WifiApManager wm;

            @Override
            protected Boolean doInBackground(Object... args) {
                bt = (ToggleButton) args[0];
                wm = (WifiApManager) args[1];
                return wm.toggleWifi("test.com");
            }
            @Override
            protected void onPostExecute (Boolean result) {
                bt.setChecked(result.booleanValue());
                bt.setEnabled(true);
            }
        };
        wifiButton.setEnabled(false);
        task.execute(wifiButton, wifiMan);
    }
}

QtAndroid::androidActivity().callStaticMethod<void>(
      "com/company/project/MyApp",
      "myFunc", // method name
      "(Landroid/content/Context;)V" // auto-injection
    );