GoogleのNeaby Messages APIの説明 Sample: https://github.com/akkm/NearbySample

4. keytool -list -v -keystore ~/.android/debug.keystore

5. • compile ‘com.google.android.gms:play-services-nearby:8.3.0'
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="info.akkuma.nearbysample" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.nearby.messages.API_KEY"
android:value=“put-your-key“ />
</application>
</manifest>
キーをここに書く

6. @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Nearby.MESSAGES_API)
.addConnectionCallbacks(mConnectionCallbacks)
.addOnConnectionFailedListener(mFailedListener)
.build();
}

8. Nearby.Messages.getPermissionStatus(mGoogleApiClient)
.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
if (status.isSuccess()) {
Nearby.Messages.subscribe(mGoogleApiClient, mMessageListener, mStrategy);
} else {
try {
status.startResolutionForResult(MainActivity.this, REQUEST_RESOLVE_ERROR);
} catch (IntentSender.SendIntentException e) {
Log.e(TAG, e.toString());
}
}
}
});
許可されていない場合
既に許可されている場合

9.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == REQUEST_RESOLVE_ERROR) {
if (resultCode == RESULT_OK) {
Nearby.Messages.subscribe(mGoogleApiClient, mMessageListener, mStrategy);
} else {
Log.d(TAG, "Failed to resolve error with code " + resultCode);
}
}
}
許可された場合

10. Message message = new Message(content);
Nearby.Messages.publish(mGoogleApiClient, message, mStrategy)
.setResultCallback(new ResultCallback<Status>(){
@Override
public void onResult(Status status) {
}
});
送信するbyte配列(1MB以下・3KB以下推奨)
送信成功時のコールバック
Strategy（後述）

11.
mMessageListener = new MessageListener() {
@Override
public void onFound(Message message) {
}
};
Nearby.Messages.subscribe(mGoogleApiClient, mMessageListener, mStrategy);
受信時のコールバック
Strategy（後述）

12. private Strategy mStrategy = new Strategy.Builder()
.setDiscoveryMode(Strategy.DISCOVERY_MODE_DEFAULT)
.setDistanceType(Strategy.DISTANCE_TYPE_DEFAULT)
.setTtlSeconds(Strategy.TTL_SECONDS_DEFAULT)
.build();

13. private Strategy mStrategy = new Strategy.Builder()
.setDiscoveryMode(Strategy.DISCOVERY_MODE_DEFAULT)
.setDistanceType(Strategy.DISTANCE_TYPE_DEFAULT)
.setTtlSeconds(Strategy.TTL_SECONDS_DEFAULT)
.build();

14. private Strategy mStrategy = new Strategy.Builder()
.setDiscoveryMode(Strategy.DISCOVERY_MODE_DEFAULT)
.setDistanceType(Strategy.DISTANCE_TYPE_DEFAULT)
.setTtlSeconds(Strategy.TTL_SECONDS_DEFAULT)
.build();

15. private Strategy mStrategy = new Strategy.Builder()
.setDiscoveryMode(Strategy.DISCOVERY_MODE_DEFAULT)
.setDistanceType(Strategy.DISTANCE_TYPE_DEFAULT)
.setTtlSeconds(Strategy.TTL_SECONDS_DEFAULT)
.build();