我正在尝试使用服务创建一个带有计时器的应用程序，但是计时器工作正常但是我的代码在计时器完成时出现问题（来到0：0）我的按钮应该再次自动重新启用但它保持不变仅在禁用状态下，我尝试了很多重新启用它但没有解决。 所以请看下面的代码并告诉我应该怎么做才能重新启用它？ 我是新的服务和Android，任何帮助将不胜感激
MainActivity.java
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn_start;
private TextView tv_timer;
String date_time;
Calendar calendar;
SimpleDateFormat simpleDateFormat;
EditText et_hours;
SharedPreferences mpref;
SharedPreferences.Editor mEditor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
listener();
et_hours.setVisibility(View.INVISIBLE);
}
private void init() {
btn_start = (Button) findViewById(R.id.btn_timer);
tv_timer = (TextView) findViewById(R.id.tv_timer);
et_hours = (EditText) findViewById(R.id.et_hours);
mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
mEditor = mpref.edit();
try {
String str_value = mpref.getString("data", "");
if (str_value.matches("")) {
et_hours.setEnabled(false);
btn_start.setEnabled(true);
tv_timer.setText("");
} else {
if (mpref.getBoolean("finish", false)) {
et_hours.setEnabled(false);
btn_start.setEnabled(true);
tv_timer.setText("");
} else {
et_hours.setEnabled(false);
btn_start.setEnabled(true);
tv_timer.setText(str_value);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void listener() {
btn_start.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_timer:
et_hours.setText("1");
et_hours.setEnabled(false);
btn_start.setEnabled(false);
calendar = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("mm:ss");
date_time = simpleDateFormat.format(calendar.getTime());
mEditor.putString("data", date_time).commit();
mEditor.putString("hours", et_hours.getText().toString()).commit();
Intent intent_service = new Intent(getApplicationContext(), Timer_Service.class);
startService(intent_service);
break;
}
}
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String str_time = intent.getStringExtra("time");
tv_timer.setText(str_time);
}
};
@Override
protected void onResume() {
super.onResume();
registerReceiver(broadcastReceiver,new IntentFilter(Timer_Service.str_receiver));
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(broadcastReceiver);
}
}
TimerService.java
public class Timer_Service extends Service {
public static String str_receiver = "com.countdowntimerservice.receiver";
private Handler mHandler = new Handler();
Calendar calendar;
SimpleDateFormat simpleDateFormat;
String strDate;
Date date_current, date_diff;
SharedPreferences mpref;
SharedPreferences.Editor mEditor;
private Timer mTimer = null;
public static final long NOTIFY_INTERVAL = 1000;
Intent intent;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
mEditor = mpref.edit();
calendar = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("mm:ss");
mTimer = new Timer();
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);
intent = new Intent(str_receiver);
}
class TimeDisplayTimerTask extends TimerTask {
@Override
public void run() {
mHandler.post(new Runnable() {
@Override
public void run() {
calendar = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("mm:ss");
strDate = simpleDateFormat.format(calendar.getTime());
Log.e("strDate", strDate);
TimeDifference();
}
});
}
}
public String TimeDifference() {
try {
date_current = simpleDateFormat.parse(strDate);
} catch (Exception e) {
}
try {
date_diff = simpleDateFormat.parse(mpref.getString("data", ""));
} catch (Exception e) {
}
try {
long diff = date_current.getTime() - date_diff.getTime();
int int_hours = Integer.valueOf(mpref.getString("hours", ""));
long int_timer = TimeUnit.MINUTES.toMillis(int_hours);
long long_hours = int_timer - diff;
long diffSeconds2 = long_hours / 1000 % 60;
long diffMinutes2 = long_hours / (60 * 1000) % 60;
//long diffHours2 = long_hours / (60 * 60 * 1000) % 24;
if (long_hours >= 0) {
String timeLeftFormatted = String.format(Locale.getDefault(), "%02d:%02d", diffMinutes2, diffSeconds2);
//String str_testing = diffMinutes2 + ":" + diffSeconds2;
Log.e("TIME", timeLeftFormatted);
if (long_hours == 0){
mEditor.putBoolean("finish", true);
mTimer.cancel();
}
updateTime(timeLeftFormatted);
} else {
mEditor.putBoolean("finish", true).commit();
mTimer.cancel();
}
}catch (Exception e){
mTimer.cancel();
mTimer.purge();
}
return "";
}
@Override
public void onDestroy() {
super.onDestroy();
Log.e("Service finish","Finish");
}
private void updateTime(String str_time){
intent.putExtra("time",str_time);
sendBroadcast(intent);
}
}
答案 0 :(得分：1)
首先，将 Intent 变为像
这样的实例变量private Button btn_start;
private TextView tv_timer;
.
.
private Intent intent_service;
在 init（）中，您的代码应该如下所示 -
intent_service = new Intent(getApplicationContext(), Timer_Service.class);
.
.
if (mpref.getBoolean("finish", false)) {
et_hours.setEnabled(false);
btn_start.setEnabled(true);
tv_timer.setText("");
} else {
et_hours.setEnabled(false);
btn_start.setEnabled(false); // a change is here
tv_timer.setText(str_value);
}
并在 onClick（查看v）内添加此行代码 -
mEditor.putBoolean("finish", false).commit();
.
.
startService(intent_service); // start the service
现在更改 BroadcastReceiver -
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String str_time = intent.getStringExtra("time");
tv_timer.setText(str_time);
}
};
要
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String str_time = intent.getStringExtra("time");
tv_timer.setText(str_time);
if (str_time.equals("00:00")) {
stopService(intent_service); // stop service after work done
btn_start.setEnabled(true);
}
}
};
现在对 Timer_Service 类进行一些小改动 -
if (long_hours == 0){
mEditor.putBoolean("finish", true).commit(); // a change is here
mTimer.cancel();
}
尝试一下，让我知道它是否有效。