在后台发送WhatsApp消息或发送消息并在android中关闭应用程序

不,这是不可能的,因为Whatsapp不提供ContentProviders,并且将来也不会.

可以重新拆解和实现基于jabber的协议.

你需要处理握手等.

无论如何,如果你不想组装整个网络的东西,它是不可能的,甚至不是root.

因为您的第二个问题(捕获Whatsapp消息并关闭应用程序):

您将需要一个Accesibility Service来捕获给定包上的所有传入事件.例如:

public static final String FACEBOOK_PACKAGE_NAME = "com.facebook.orca";

public class DefaultAccessibility extends AccessibilityService {
  @Override
public void onAccessibilityEvent(AccessibilityEvent event) {
    final int eventType = event.getEventType();
    try {
        if (Build.VERSION.SDK_INT >= 16) {
            switch (eventType) {
                case AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED:
                Notification notification = (Notification) event.getParcelableData();
                if (event.getPackageName().equals(WHATSAPP_PACKAGE_NAME)) {
                        RemoteViews views = notification.bigContentView;
                        Class<?> secretClass = views.getClass();
                        ArrayList<String> raw = new ArrayList<String>();
                        Field outerFields[] = secretClass.getDeclaredFields();
                        for (Field outerField : outerFields) {
                            if (outerField.getName().equals("mActions")) {
                                outerField.setAccessible(true);
                                ArrayList<Object> actions = null;
                                try {
                                actions = (ArrayList<Object>) outerField.get(views);
                                for (Object action : actions) {
                                Field innerFields[] = action.getClass()getDeclaredFields();

                                        Object value = null;
                                        Integer type = null;
                                        for (Field field : innerFields) {
                                            try {
                                                field.setAccessible(true);
                                                if (field.getName().equals("type")) {
                                                    type = field.getInt(action);
                                                } else if (field.getName().equals("value")) {
                                                    value = field.get(action);
                                                }
                                            } catch (IllegalArgumentException e) {
                                            } catch (IllegalAccessException e) {
                                            }
                                        }

                                        if (type != null && type == 10 && value != null) {
                                            raw.add(value.toString());
                                        }
                                    }
                                } catch (IllegalArgumentException e1) {
                                } catch (IllegalAccessException e1) {
                                }
                            }
                            parseWhatsappRawMessages(raw);

                        }
                }
}

和解析方法.

private void parseWhatsappRawMessages(ArrayList<String> raw) {

        int count = raw.size();
        if (count > 2) {
                Log.d(TAG, "RAW TITLE: " + raw.get(0));
                Log.d(TAG, "RAW MESSAGE: " + raw.get(1));
        }
}

您现在可以解析消息的原始消息并执行您想要的任何操作.

不要忘记在清单中注册accesibilityService并让用户启用它.

    <service
        android:name="com.app.DefaultAccessibility"
        android:enabled="true"
        android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
        <intent-filter>
            <action android:name="android.accessibilityservice.AccessibilityService"></action>
        </intent-filter>
        <meta-data
            android:name="android.accessibilityservice"
            android:resource="@xml/accessibilityservice"/>
    </service>

并且您的xml/accesibilityservice.xml文件应包含您要为accesibilityservice启用的任何内容.

<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
android:accessibilityEventTypes="typeAllMask"
android:accessibilityFeedbackType="feedbackAllMask"
android:notificationTimeout="100"
android:description="@string/accessibility_service_description" />

并且不要忘记让用户激活它.您可以通过致电直接让用户访问该设置

Intent intent = new Intent(android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS);
startActivityForResult(intent, 1337);