如何通过whatsapp从我的android应用程序向号码发送消息？

我在android studio上制作了一个android应用程序，我想通过whatsapp向一个号码发送消息。该号码不在我的联系人列表中。我已尝试在stackoverflow上找到以下代码：

Uri mUri = Uri.parse("smsto:+999999999");
Intent mIntent = new Intent(Intent.ACTION_SENDTO, mUri);
mIntent.setPackage("com.whatsapp");
mIntent.putExtra("sms_body", "The text goes here");
mIntent.putExtra("chat",true);
startActivity(mIntent);

但它抛出一个异常“未找到活动”

我还发现了一个代码，但它打开了聊天屏幕，我不希望这意味着用户应该只收到发送的消息，而不是其他任何消息 屏幕

如果有人有解决办法，请告诉我

public void onClickWhatsApp(View view) {

PackageManager pm=getPackageManager();
try {

    Intent waIntent = new Intent(Intent.ACTION_SEND);
    waIntent.setType("text/plain");
    String text = "YOUR TEXT HERE";

    PackageInfo info=pm.getPackageInfo("com.whatsapp",  
    PackageManager.GET_META_DATA);
    //Check if package exists or not. If not then code 
    //in catch block will be called
    waIntent.setPackage("com.whatsapp");

    waIntent.putExtra(Intent.EXTRA_TEXT, text);
    startActivity(Intent.createChooser(waIntent, "Share with"));

    } catch (NameNotFoundException e) {
    Toast.makeText(this, "WhatsApp not Installed", Toast.LENGTH_SHORT)
            .show();
    }  

    }

---

尝试此操作，或检查此链接使用此功能向whats应用程序上的任何号码发送消息

public void  whatsApp(View v) {

   String smsNumber = "97xxxxxxx";
    boolean isWhatsappInstalled = whatsappInstalledOrNot("com.whatsapp");
    if (isWhatsappInstalled) {

        Intent sendIntent = new Intent("android.intent.action.MAIN");
        sendIntent.setComponent(new ComponentName("com.whatsapp", "com.whatsapp.Conversation"));
        sendIntent.putExtra("jid", PhoneNumberUtils.stripSeparators(smsNumber) + "@s.whatsapp.net");//phone number without "+" prefix

        startActivity(sendIntent);
    } else {
        Uri uri = Uri.parse("market://details?id=com.whatsapp");
        Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
        Toast.makeText(this, "WhatsApp not Installed",
                Toast.LENGTH_SHORT).show();
        startActivity(goToMarket);
    }
}

private boolean whatsappInstalledOrNot(String uri) {
    PackageManager pm = getPackageManager();
    boolean app_installed = false;
    try {
        pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
        app_installed = true;
    } catch (PackageManager.NameNotFoundException e) {
        app_installed = false;
    }
    return app_installed;
}

**

我从我朋友的网站上找到了这些代码

---

**

活动\u main.xml

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.code2care.example.whatsappintegrationexample.MainActivity"
    tools:ignore="HardcodedText" >

    android:id="@+id/message"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:onClick="sendMessae"
    android:layout_marginBottom="21dp"
    android:text="Send to WhatsApp" />

    android:id="@+id/editText1"
    android:layout_width="fill_parent"
    android:hint="Type your WhatsApp message here ...."
    android:layout_alignParentTop="true"
    android:background="#FFFFFFEF"
    android:padding="10dp"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="65dp"
    android:layout_height="200dp"
    android:ems="10" />

活动\u main.java

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends ActionBarActivity {

    private EditText message;

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

        message = (EditText) findViewById(R.id.message);

    }

    public void sendMessage(View v) {

        String whatsAppMessage = message.getText().toString();

        Intent sendIntent = new Intent();
        sendIntent.setAction(Intent.ACTION_SEND);
        sendIntent.putExtra(Intent.EXTRA_TEXT, whatsAppMessage);
        sendIntent.setType("text/plain");

        // Do not forget to add this to open whatsApp App specifically
        sendIntent.setPackage("com.whatsapp");
        startActivity(sendIntent);

    }

}

---

你试过这个吗-？你不能在没有用户交互的情况下发送消息，这是个糟糕的主意。看到了吗？看到了吗