我正在对 GoogleTV 和 Android 平板电脑进行一些调查。我已经设法制作了一个 android 应用程序，它可以从主 Activity 向谷歌电视发送控制消息，我想做的是从主 Activity 启动一个新活动，并继续使用 AnymoteClientService 服务和新活动。在我的主要活动中，我得到了一个 anymoteSender 句柄，用于将 KeyEvent 消息发送到谷歌电视，如何将其传输到新活动（SlidepuzzleActivity）？我可以再次实例化它，但这意味着必须再次经历整个配对过程。
从下面的代码中，您将看到我的 SlidepuzzleActivity 类中有一个 anymoteSender，这将引发错误，但说明了我需要在哪里重用该变量。
代码：MainActivity.java：
package uk.co.myapp.gtvremote;
//imports removed for paste
public class MainActivity extends Activity implements ClientListener{
private AnymoteSender anymoteSender;
private TextView statusText;
protected AnymoteClientService mAnymoteClientService;
private static String statusPrefix = "Status: ";
private Context mContext;
private ProgressBar progressBar;
private Handler handler;
private TouchHandler touchPadHandler;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
progressBar = (ProgressBar) findViewById(R.id.a_progressbar);
progressBar.setVisibility(View.VISIBLE);
mContext = this;
ImageButton upArrowButton = (ImageButton) findViewById(R.id.upArrow);
ImageButton leftArrowButton = (ImageButton) findViewById(R.id.leftArrow);
ImageButton centreButton = (ImageButton) findViewById(R.id.centreButton);
ImageButton rightArrowButton = (ImageButton) findViewById(R.id.rightArrow);
ImageButton downArrowButton = (ImageButton) findViewById(R.id.downArrow);
ImageButton backButton = (ImageButton) findViewById(R.id.backButton);
ImageButton homeButton = (ImageButton) findViewById(R.id.homeButton);
Button testButton = (Button) findViewById(R.id.testButton);
upArrowButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_DPAD_UP);
}
});
leftArrowButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_DPAD_LEFT);
}
});
centreButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_DPAD_CENTER);
}
});
rightArrowButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_DPAD_RIGHT);
}
});
downArrowButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_DPAD_DOWN);
}
});
backButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_BACK);
}
});
homeButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendKeyEvent(KeyEvent.KEYCODE_HOME);
}
});
testButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, SlidepuzzleActivity.class);
MainActivity.this.startActivity(myIntent);
}
});
handler = new Handler();
// Bind to the AnymoteClientService
Intent intent = new Intent(mContext, AnymoteClientService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
statusText = (TextView) findViewById(R.id.statusText);
}
/** Defines callbacks for service binding, passed to bindService() */
private ServiceConnection mConnection = new ServiceConnection() {
/*
* ServiceConnection listener methods.
*/
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mAnymoteClientService = ((AnymoteClientService.AnymoteClientServiceBinder) service)
.getService();
mAnymoteClientService.attachClientListener(MainActivity.this);
}
@Override
public void onServiceDisconnected(ComponentName name) {
mAnymoteClientService.detachClientListener(MainActivity.this);
mAnymoteClientService = null;
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onConnected(AnymoteSender anymoteSender) {
if (anymoteSender != null) {
// Send events to Google TV using anymoteSender.
// save handle to the anymoteSender instance.
this.anymoteSender = anymoteSender;
attachTouchListnertoTouchPad();
} else {
statusText.setText(statusPrefix + "Connection attempt failed, cant find send handler");
//attempt to connect again?
//attemptToConnect();
}
// Hide the progressBar once connection to Google TV is established. Make the text display appropriately
handler.post(new Runnable() {
public void run() {
progressBar.setVisibility(View.INVISIBLE);
statusText.setText(statusPrefix + "Connected to GoogleTV");
}
});
}
@Override
public void onDisconnected() {
// show message to tell the user about disconnection.
statusText.setText(statusPrefix + "Disconnected");
// Try to connect again if needed. This may be need to be done via button
attemptToConnect();
this.anymoteSender = null;
}
@Override
public void onConnectionError() {
// show message to tell the user about disconnection.
statusText.setText(statusPrefix + "Connection error encountered");
// Try to connect again if needed.
attemptToConnect();
this.anymoteSender = null;
}
@Override
protected void onDestroy() {
if (mAnymoteClientService != null) {
mAnymoteClientService.detachClientListener(this);
}
unbindService(mConnection);
super.onDestroy();
}
private void attachTouchListnertoTouchPad()
{
// Attach touch handler to the touchpad view
touchPadHandler = new TouchHandler(
findViewById(R.id.touchPad), Mode.POINTER_MULTITOUCH, anymoteSender);
}
public void attemptToConnect()
{
//stub to invoke connection attempt
}
private void sendKeyEvent(final int keyEvent) {
// create new Thread to avoid network operations on UI Thread
if (anymoteSender == null) {
Toast.makeText(MainActivity.this, "Waiting for connection",
Toast.LENGTH_LONG).show();
return;
}
anymoteSender.sendKeyPress(keyEvent);
}
}
SlidepuzzleActivity.java：
package uk.co.myapp.gtvremote;
//imports removed for paste
public class SlidepuzzleActivity extends Activity implements ClientListener{
private AnymoteClientService mAnymoteClientService;
private Context mContext;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.slidepuzzle);
mContext = this;
ImageButton piece1x1 = (ImageButton) findViewById(R.id.piece1x1);
ImageButton piece1x2 = (ImageButton) findViewById(R.id.piece1x2);
ImageButton piece1x3 = (ImageButton) findViewById(R.id.piece1x3);
ImageButton piece2x1 = (ImageButton) findViewById(R.id.piece2x1);
ImageButton piece2x2 = (ImageButton) findViewById(R.id.piece2x2);
ImageButton piece2x3 = (ImageButton) findViewById(R.id.piece2x3);
ImageButton piece3x1 = (ImageButton) findViewById(R.id.piece3x1);
ImageButton piece3x2 = (ImageButton) findViewById(R.id.piece3x2);
ImageButton piece3x3 = (ImageButton) findViewById(R.id.piece3x3);
Intent intent = new Intent(mContext, AnymoteClientService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
piece1x1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
private ServiceConnection mConnection = new ServiceConnection() {
/*
* ServiceConnection listener methods.
*/
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mAnymoteClientService = ((AnymoteClientService.AnymoteClientServiceBinder) service)
.getService();
mAnymoteClientService.attachClientListener(SlidepuzzleActivity.this);
}
@Override
public void onServiceDisconnected(ComponentName name) {
mAnymoteClientService.detachClientListener(SlidepuzzleActivity.this);
mAnymoteClientService = null;
}
};
private void sendKeyEvent(final int keyEvent) {
// create new Thread to avoid network operations on UI Thread
if (anymoteSender == null) {
Toast.makeText(SlidepuzzleActivity.this, "Waiting for connection",
Toast.LENGTH_LONG).show();
return;
}
anymoteSender.sendKeyPress(keyEvent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.slidepuzzle, menu);
return true;
}
@Override
public void onConnected(AnymoteSender anymoteSender) {
// TODO Auto-generated method stub
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
}
@Override
public void onConnectionError() {
// TODO Auto-generated method stub
}
@Override
protected void onDestroy() {
if (mAnymoteClientService != null) {
mAnymoteClientService.detachClientListener(this);
}
unbindService(mConnection);
super.onDestroy();
}
}