public class Song extends Activity implements OnClickListener,Runnable {
private SeekBar progress;
private MediaPlayer mp;
// ...
private ServiceConnection onService = new ServiceConnection() {
public void onServiceConnected(ComponentName className,
IBinder rawBinder) {
appService = ((MPService.LocalBinder)rawBinder).getService(); // service that handles the MediaPlayer
progress.setVisibility(SeekBar.VISIBLE);
progress.setProgress(0);
mp = appService.getMP();
appService.playSong(title);
progress.setMax(mp.getDuration());
new Thread(Song.this).start();
}
public void onServiceDisconnected(ComponentName classname) {
appService = null;
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.song);
// ...
progress = (SeekBar) findViewById(R.id.progress);
// ...
}
public void run() {
int pos = 0;
int total = mp.getDuration();
while (mp != null && pos<total) {
try {
Thread.sleep(1000);
pos = appService.getSongPosition();
} catch (InterruptedException e) {
return;
} catch (Exception e) {
return;
}
progress.setProgress(pos);
}
}
String time = String.format("%d:%d",
TimeUnit.MILLISECONDS.toMinutes(pos),
TimeUnit.MILLISECONDS.toSeconds(pos),
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(
pos))
);
currentTime.setText(time); // currentTime = (TextView) findViewById(R.id.current_time);
runOnUiThread(new Runnable() {
@Override
public void run() {
// Stuff that updates the UI
}
});
thread = new Thread(){
@Override
public void run() {
try {
synchronized (this) {
wait(5000);
runOnUiThread(new Runnable() {
@Override
public void run() {
dbloadingInfo.setVisibility(View.VISIBLE);
bar.setVisibility(View.INVISIBLE);
loadingText.setVisibility(View.INVISIBLE);
}
});
}
} catch (InterruptedException e) {
e.printStackTrace();
}
Intent mainActivity = new Intent(getApplicationContext(),MainActivity.class);
startActivity(mainActivity);
};
};
thread.start();
private void setText(final TextView text,final String value){
runOnUiThread(new Runnable() {
@Override
public void run() {
text.setText(value);
}
});
}
通常,涉及用户界面的任何操作都必须在主线程或 UI 线程中完成,即在其中执行onCreate()
和事件处理的操作。一种确保使用runOnUiThread()的方式 ,另一种使用处理程序。
ProgressBar.setProgress()
具有一种始终在主线程上执行的机制,所以这才起作用。
请参阅无痛线程 。
public class ViewExecution extends Activity implements Observer{
static final int PROGRESS_DIALOG = 0;
ProgressDialog progressDialog;
int currentNumber;
public void onCreate(Bundle savedInstanceState) {
currentNumber = 0;
final Button launchPolicyButton = ((Button) this.findViewById(R.id.launchButton));
launchPolicyButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showDialog(PROGRESS_DIALOG);
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
switch(id) {
case PROGRESS_DIALOG:
progressDialog = new ProgressDialog(this);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage("Loading");
progressDialog.setCancelable(true);
return progressDialog;
default:
return null;
}
}
@Override
protected void onPrepareDialog(int id, Dialog dialog) {
switch(id) {
case PROGRESS_DIALOG:
progressDialog.setProgress(0);
}
}
// Define the Handler that receives messages from the thread and update the progress
final Handler handler = new Handler() {
public void handleMessage(Message msg) {
int current = msg.arg1;
progressDialog.setProgress(current);
if (current >= 100){
removeDialog (PROGRESS_DIALOG);
}
}
};
// The method called by the observer (the second thread)
@Override
public void update(Observable obs, Object arg1) {
Message msg = handler.obtainMessage();
msg.arg1 = ++currentPluginNumber;
handler.sendMessage(msg);
}
}
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
//do stuff like remove view etc
adapter.remove(selecteditem);
}
});
private static final int SHOW_LOG = 1;
private static final int HIDE_LOG = 0;
//TODO __________[ Handler ]__________
@SuppressLint("HandlerLeak")
protected Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
// Put code here...
// Set a switch statement to toggle it on or off.
switch(msg.what)
{
case SHOW_LOG:
{
ads.setVisibility(View.VISIBLE);
break;
}
case HIDE_LOG:
{
ads.setVisibility(View.GONE);
break;
}
}
}
};
//TODO __________[ Callbacks ]__________
@Override
public void showHandler(boolean show)
{
handler.sendEmptyMessage(show ? SHOW_LOG : HIDE_LOG);
}
showHandler(true);
void showCode() {
hideRegisterMessage(); // Hides view
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showRegisterMessage(); // Shows view
}
}, 3000); // After 3 seconds
}
Handler handler = new Handler(Looper.getMainLooper()) {
@Override
public void handleMessage(Message msg) {
// Any UI task, example
textView.setText("your text");
}
};
handler.sendEmptyMessage(1);