Google Cloud Messaging for Android で、サーバ側をAndroidにしてみた

MainActivity.java

// 参考 http://d.hatena.ne.jp/azukinohiroki/20120628/1340868610

package net.vvakame.gcmsample;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;

import com.google.android.gcm.GCMRegistrar;

public class MainActivity extends Activity {

	static final String TAG = MainActivity.class.getSimpleName();

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		GCMRegistrar.checkDevice(this);
		GCMRegistrar.checkManifest(this);
		final String regId = GCMRegistrar.getRegistrationId(this);
		if (regId.equals("")) {
			GCMRegistrar.register(this, "335588306847");
		} else {
			Log.v(TAG, "Already registered");
		}

		StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
				.permitAll().build());
		findViewById(R.id.gcm).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				try {
					sendGCM("hoge");
				} catch (ClientProtocolException e) {
					throw new RuntimeException(e);
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
		});
	}

	private void sendGCM(final String message) throws ClientProtocolException,
			IOException {

		final String url = "https://android.googleapis.com/gcm/send";
		final String registrationId = "ここに端末のregistrationID入れる";
		final String apiKey = "こっちにAPI Key入れる";

		HttpPost req = new HttpPost(url);
		req.addHeader("Content-Type",
				"application/x-www-form-urlencoded;charset=UTF-8");
		req.addHeader("Authorization", "key=" + apiKey);

		List<NameValuePair> params = new ArrayList<NameValuePair>();
		params.add(new BasicNameValuePair("registration_id", registrationId));
		params.add(new BasicNameValuePair("collapse_key", "update"));
		params.add(new BasicNameValuePair("data.message", message));
		req.setEntity(new UrlEncodedFormEntity(params));

		new DefaultHttpClient().execute(req);
	}
}