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我试图使用Nearby Messages API在一个活动（曲目，专辑，艺术家）中发布多个字符串，并订阅它们并让它们在Textview中显示在另一个活动中。当我运行它时，只有一个字符串出现在应用程序中，它出现在所有3个文本视图中。有没有办法发布多个字符串或消息，以便它们可以同时出现在单独的TextView中？如果我遗漏了任何东西，请告诉我。 首先是出版活动：在附近消息中发送多个消息/字符串API
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.nearby.Nearby;
import com.google.android.gms.nearby.messages.Message;
import static com.example.mark.prototype9.MainActivity.RETURN;
public class MusicPlayingActivity extends AppCompatActivity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener
{
public static final String TAG = "track";
public static final String TAG1 = "album";
public static final String TAG2 = "artist";
public static final String SERVICECMD = "com.android.music.musicservicecommand";
GoogleApiClient mGoogleApiClient;
Message mActiveMessage, nActiveMessage, oActiveMessage;
TextView artist;
TextView album;
TextView title;
Button songfeed;
private void publish(String message, String message1, String message2) {
Log.i(TAG, "Publishing message: " + message + message1);
Log.i(TAG1, "Publishing message: " + message1);
Log.i(TAG2, "Publishing message: " + message2);
mActiveMessage = new Message(message.getBytes());
nActiveMessage = new Message(message1.getBytes());
oActiveMessage = new Message(message2.getBytes());
Nearby.Messages.publish(mGoogleApiClient, mActiveMessage);
Nearby.Messages.publish(mGoogleApiClient, nActiveMessage);
Nearby.Messages.publish(mGoogleApiClient, oActiveMessage);
}
private void unpublish() {
Log.i(TAG, "Unpublishing.");
Log.i(TAG1, "Unpublishing.");
Log.i(TAG2, "Unpublishing.");
if (mActiveMessage != null)
if(nActiveMessage !=null)
if(oActiveMessage !=null) {
Nearby.Messages.unpublish(mGoogleApiClient, mActiveMessage);
Nearby.Messages.unpublish(mGoogleApiClient, nActiveMessage);
Nearby.Messages.unpublish(mGoogleApiClient, oActiveMessage);
mActiveMessage = null;
nActiveMessage = null;
oActiveMessage = null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Nearby.MESSAGES_API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.enableAutoManage(this, this)
.build();
setContentView(R.layout.activity_music_playing);
artist = (TextView) findViewById(R.id.artist);
album = (TextView) findViewById(R.id.album);
title = (TextView) findViewById(R.id.title);
songfeed = (Button) findViewById(R.id.songfeed);
IntentFilter iF = new IntentFilter();
iF.addAction("com.android.music.metachanged");
iF.addAction("com.android.music.playstatechanged");
iF.addAction("com.android.music.playbackcomplete");
iF.addAction("com.android.music.queuechanged");
iF.addAction("com.htc.music.metachanged");
iF.addAction("fm.last.android.metachanged");
iF.addAction("com.sec.android.app.music.metachanged"); //intentFilters assigned to music-playing activities in other applications
iF.addAction("com.nullsoft.winamp.metachanged");
iF.addAction("com.amazon.mp3.metachanged");
iF.addAction("com.miui.player.metachanged");
iF.addAction("com.real.IMP.metachanged");
iF.addAction("com.sonyericsson.music.metachanged");
iF.addAction("com.rdio.android.metachanged");
iF.addAction("com.samsung.sec.android.MusicPlayer.metachanged");
iF.addAction("com.andrew.apollo.metachanged");
registerReceiver(mReceiver, iF); //BroadcastReceiver listens for data broadcast by other activities
songfeed.setOnClickListener(new View.OnClickListener(){ //commanding "songfeed" button to return user to MainActivity
@Override
public void onClick (View v){
Intent getResult = new Intent(getApplicationContext(), MainActivity.class);
startActivityForResult(getResult, RETURN);
}
});
}
public BroadcastReceiver mReceiver = new BroadcastReceiver() { //new instance of BroadcastReceiver
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
String cmd = intent.getStringExtra("command");
Log.v("tag ", action + "/" + cmd);
String artists = intent.getStringExtra("artist"); //receiving data through IntentFilters, converting received data to String
String albums = intent.getStringExtra("album");
String tracks = intent.getStringExtra("track");
Log.v("tag", artists + ":" + albums + ":" + tracks);
artist.setText(artists);
album.setText(albums); //setting String data to TextView
title.setText(tracks);
publish(tracks, albums, artists);
unregisterReceiver(mReceiver);
}
};
@Override
public void onConnected(Bundle connectionHint) {
}
@Override
public void onStop() {
unpublish();
super.onStop();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
订阅活动
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.nearby.Nearby;
import com.google.android.gms.nearby.messages.Message;
import com.google.android.gms.nearby.messages.MessageListener;
import com.google.android.gms.nearby.messages.SubscribeOptions;
import static com.example.mark.prototype9.MainActivity.RETURN;
import static com.example.mark.prototype9.MusicPlayingActivity.TAG;
import static com.example.mark.prototype9.MusicPlayingActivity.TAG1;
import static com.example.mark.prototype9.MusicPlayingActivity.TAG2;
public class SubActivity extends AppCompatActivity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
GoogleApiClient nGoogleApiClient;
MessageListener mMessageListener, nMessageListener, oMessageListener;
SubscribeOptions options;
TextView track1;
TextView album1;
TextView artist1;
TextView track2;
TextView album2;
TextView artist2;
TextView track3;
TextView album3;
TextView artist3;
Button back;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pub_sub);
nGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Nearby.MESSAGES_API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.enableAutoManage(this, this)
.build();
options = new SubscribeOptions.Builder()
//.setCallback(myCallback)
.build();
//data to receive
track1 = (TextView) findViewById(R.id.track1);
album1 = (TextView) findViewById(R.id.album1);
artist1 = (TextView) findViewById(R.id.artist1);
track2 = (TextView) findViewById(R.id.track2);
album2 = (TextView) findViewById(R.id.album2);
artist2 = (TextView) findViewById(R.id.artist2);
track3 = (TextView) findViewById(R.id.track3);
album3 = (TextView) findViewById(R.id.album3);
artist3 = (TextView) findViewById(R.id.artist3);
back = (Button) findViewById(R.id.back);
//Track
mMessageListener = new MessageListener() {
@Override
public void onFound(Message message) {
String messageAsString = new String(message.getContent());
Log.i(TAG, "Found message: " + messageAsString);
track1.setText("Someone is listening to "+messageAsString);
}
@Override
public void onLost(Message message) {
String messageAsString = new String(message.getContent());
Log.i(TAG, "Lost sight of message: " + messageAsString);
}
};
//album
nMessageListener = new MessageListener() {
@Override
public void onFound(Message message1) {
String messageAsString1 = new String(message1.getContent());
Log.i(TAG1, "Found message: " + messageAsString1);
album1.setText("from "+messageAsString1);
}
@Override
public void onLost(Message message1) {
String messageAsString1 = new String(message1.getContent());
Log.i(TAG1, "Lost sight of message: " + messageAsString1);
}
};
//artist
oMessageListener = new MessageListener() {
@Override
public void onFound(Message message2) {
String messageAsString2 = new String(message2.getContent());
Log.i(TAG2, "Found message: " + messageAsString2);
artist1.setText("by "+messageAsString2);
}
@Override
public void onLost(Message message2) {
String messageAsString2 = new String(message2.getContent());
Log.i(TAG2, "Lost sight of message: " + messageAsString2);
}
};
back.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick (View v){
Intent getResult = new Intent(getApplicationContext(), MainActivity.class);
startActivityForResult(getResult, RETURN);
}
});
}
// Subscribe to receive messages.
private void subscribe() {
try{
Log.i(TAG, "Subscribing.");
Nearby.Messages.subscribe(nGoogleApiClient, mMessageListener, options);
Nearby.Messages.subscribe(nGoogleApiClient, nMessageListener, options);
Nearby.Messages.subscribe(nGoogleApiClient, oMessageListener, options);
}
catch (NullPointerException n){
n.printStackTrace();
}
}
private void unsubscribe() {
Log.i(TAG, "Unsubscribing.");
Nearby.Messages.unsubscribe(nGoogleApiClient, mMessageListener);
Nearby.Messages.unsubscribe(nGoogleApiClient, nMessageListener);
Nearby.Messages.unsubscribe(nGoogleApiClient, oMessageListener);
}
@Override
public void onConnected(Bundle b) {
subscribe();
}
@Override
public void onStop() {
unsubscribe();
super.onStop();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}