Android activity 点击Firebase通知时显示特定活动

当用户点击Firebase控制台发送的通知时，我需要启动特定的Android活动，只有当用户点击通知时。如何在以下两种情况下实现这一点：

应用未打开或应用正在后台运行

应用程序位于前台

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你可以通过两种方式实现这一点

1。第一条路

在通知有效负载中添加单击操作， jNotification.put（“单击操作”、“打开活动1”）

private void pushNotification(String token) {
        JSONObject jPayload = new JSONObject();
        JSONObject jNotification = new JSONObject();
        JSONObject jData = new JSONObject();
        try {
            jNotification.put("title", "Google I/O 2016");
            jNotification.put("text", "Firebase Cloud Messaging (App)");
            jNotification.put("sound", "default");
            jNotification.put("badge", "1");
            jNotification.put("click_action", "OPEN_ACTIVITY_1");

            jData.put("picture_url", "http://opsbug.com/static/google-io.jpg");

            jPayload.put("to", token);
            //jPayload.put("to", "/topics/news");
            //jPayload.put("condition", "'logined' in topics || 'news' in topics");
            //jPayload.put("registration_ids", jData);
            jPayload.put("priority", "high");
            jPayload.put("notification", jNotification);
            jPayload.put("data", jData);

            URL url = new URL("https://fcm.googleapis.com/fcm/send");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Authorization", AUTH_KEY);
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setDoOutput(true);

            // Send FCM message content.
            OutputStream outputStream = conn.getOutputStream();
            outputStream.write(jPayload.toString().getBytes());

            // Read FCM response.
            InputStream inputStream = conn.getInputStream();
            final String resp = convertStreamToString(inputStream);

            Handler h = new Handler(Looper.getMainLooper());
            h.post(new Runnable() {
                @Override
                public void run() {
                    Log.e("Response", resp);
                    //txtStatus.setText(resp);
                }
            });
        } catch (JSONException | IOException e) {
            e.printStackTrace();
        }
    }

将其添加到您的AndroidManifest.xml中

        <activity android:name="com.example.fcm.SecondActivity">
            <intent-filter>
                <action android:name="OPEN_ACTIVITY_1" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

2。第二条路

通过下面的数据有效负载发送密钥，通过getIntent（）获取MainActivity中的密钥，并调用特定的活动或片段

        json1.put("title","Your Title");  
        json1.put("body","body content");  
        json1.put("message","Your Message");  
        json1.put("screen","2");   //secondFragment is 2nd position in nav drawer
        json.put("data", json1); 

MainActivity.java

public class SecondActivity extends AppCompatActivity {
    private static final String TAG = "SecondActivity";

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

        Bundle bundle = getIntent().getExtras();

        if (bundle != null) {
            for (String key : bundle.keySet()) {
                Object value = bundle.get(key);
                Log.d(TAG, "Key: " + key + " Value: " + value.toString());
            }
        }
    }
}

Intent intent = getIntent();
        String pos = getIntent().getStringExtra("screen");
        if(pos !=null){
            selectDrawerItem(navigationView.getMenu().getItem(Integer.parseInt(pos)));
        }

GITHUB中的示例项目，

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当前无法控制点击通知时启动的活动。请看Hi Frank，您是否也可以告诉我如何从firebase以json的形式发送消息/通知。您需要从服务器发送下游消息。请参阅@FrankvanPuffelen感谢您的及时回复。如何从Firebase控制台或任何第三方云推送平台发送带有数据（json）的下游消息，因为我没有访问任何内部服务器的权限。在Firebase composer的高级部分，您将能够添加作为intent extras传递到启动活动的键值对。

Intent intent = getIntent();
        String pos = getIntent().getStringExtra("screen");
        if(pos !=null){
            selectDrawerItem(navigationView.getMenu().getItem(Integer.parseInt(pos)));
        }