android - 向特定联系人发送 Whatsapp 消息

Question

我关注了 link这是我的代码

Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("content://com.android.contacts/data/" + "MYNUMBER@s.whatsapp.net"));
                i.setPackage("com.whatsapp");
                startActivity(i);

这是我的日志

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=content://com.android.contacts/data/MYNUMBER@s.whatsapp.net pkg=com.whatsapp }
        at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1545)
        at android.app.Instrumentation.execStartActivity(Instrumentation.java:1416)
        at android.app.Activity.startActivityForResult(Activity.java:3351)
        at android.app.Activity.startActivityForResult(Activity.java:3312)
        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:824)
        at android.app.Activity.startActivity(Activity.java:3522)
        at android.app.Activity.startActivity(Activity.java:3490)
        at com.sieryuu.maidchan.MainActivity.onClick(MainActivity.java:61)
        at android.view.View.performClick(View.java:4147)
        at android.view.View$PerformClick.run(View.java:17161)
        at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:213)
        at android.app.ActivityThread.main(ActivityThread.java:4787)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)

我的问题:如何在后台向whatsapp联系人发送文本(不选择联系人号码，我已经知道ID)？ 根(如果需要)

Answer 1

我找到了执行此操作的正确方法，并且在您阅读本文后很简单:http://howdygeeks.com/send-whatsapp-message-unsaved-number-android/

电话和消息都是字符串。

源代码:

try {
            PackageManager packageManager = context.getPackageManager();
            Intent i = new Intent(Intent.ACTION_VIEW);
            String url = "https://api.whatsapp.com/send?phone="+ phone +"&text=" + URLEncoder.encode(message, "UTF-8");
            i.setPackage("com.whatsapp");
            i.setData(Uri.parse(url));
            if (i.resolveActivity(packageManager) != null) {
                context.startActivity(i);
            }
        } catch (Exception e){
            e.printStackTrace();
        }

享受吧!