android - 带有 Handler 和 SharedPreference 的计时器
问题描述
现在,我尝试使用处理程序和 sharedpreferences 来制作计时器。
今天我遇到了共享首选项的问题。
问题是可以按下开始按钮并转到后台然后重新启动此应用程序,该应用程序正常工作。
但是,如果我尝试两次模式(按下开始按钮 -> 背景 -> 应用程序 -> 背景 -> 应用程序),则显示时间的文本视图变为零......我不知道是什么问题……
这是代码..
private Button mStartBtn, mStopBtn, mRecordBtn, mPauseBtn;
private TextView mTimeTextView, mRecordTextView;
private Thread timeThread = null;
private Boolean isRunning = false;
ArrayList<String> record = new ArrayList<>();
Boolean timeThreadd = false;
long i;
long mEndTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stop_watch);
if (Build.VERSION.SDK_INT >= 21) {
getWindow().setStatusBarColor(Color.parseColor("#4ea1d3"));
}
mStartBtn = (Button) findViewById(R.id.btn_start);
mStopBtn = (Button) findViewById(R.id.btn_stop);
mRecordBtn = (Button) findViewById(R.id.btn_record);
mPauseBtn = (Button) findViewById(R.id.btn_pause);
mTimeTextView = (TextView) findViewById(R.id.timeView);
mRecordTextView = (TextView) findViewById(R.id.recordView);
mStartBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
v.setVisibility(View.GONE);
mStopBtn.setVisibility(View.VISIBLE);
mRecordBtn.setVisibility(View.VISIBLE);
mPauseBtn.setVisibility(View.VISIBLE);
if (isRunning != true) {
isRunning = true;
}// start 가 true 일때만 실행된다.
timeThread = new Thread(new timeThread());
timeThread.start();
}
});
mStopBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
v.setVisibility(View.GONE);
mRecordBtn.setVisibility(View.GONE);
mStartBtn.setVisibility(View.VISIBLE);
mPauseBtn.setVisibility(View.GONE);
mRecordTextView.setText("");
mTimeTextView.setText("00:00:00:00");
timeThread.interrupt();
i = 0;
mEndTime = 0;
timeThreadd = false;
isRunning = false;
if (record.size() > 1) {
for (int i = 0; i < record.size(); i++) {
record.remove(i);
}
}
SharedPreferences sharedPreferences = getSharedPreferences("timer", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
}
});
mRecordBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
record.add(mTimeTextView.getText().toString());
mRecordTextView.setText(mRecordTextView.getText() + mTimeTextView.getText().toString() + "\n");
}// 앞에 mRecordTextView.getText()은 n번이상 저장할때 첫번째 값을 n-1번째 라인에 놓고
}); // n번째 저장한것을 n번째 놓기 위해서 설정
mPauseBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isRunning = !isRunning;
if (isRunning) {
mPauseBtn.setText("PAUSE");
} else {
mPauseBtn.setText("PAUSE");
}
}
});
}
@SuppressLint("HandlerLeak")
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
int mSec = msg.arg1 % 100;
int sec = (msg.arg1 / 100) % 60;
int min = (msg.arg1 / 100) / 60;
int hour = (msg.arg1 / 100) / 360;
//1000 = 1 sec, 1000*60 = 1 min, 1000*60*10 = 10min 1000*60*60 = 1 hour
@SuppressLint("DefaultLocale")
String result = String.format(Locale.getDefault(), "%02d:%02d:%02d:%02d", hour, min, sec, mSec);
mTimeTextView.setText(result);
}
};
public class timeThread implements Runnable {
@Override
public void run() {
mEndTime = System.currentTimeMillis() / 10 + i;
timeThreadd = true;
while (true) {
while (isRunning) { //일시정지를 누르면 멈춤
Message msg = new Message();
msg.arg1 = (int) i++;
handler.sendMessage(msg);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
mTimeTextView.setText("");
mTimeTextView.setText("00:00:00:00");
}
});
return;
}
}
}
}
}
@Override
protected void onStop() {
super.onStop();
SharedPreferences sharedpreferences = getSharedPreferences("timer", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putLong("time", i);
editor.putBoolean("switch", isRunning);
editor.putInt("recordsize", record.size());
editor.putLong("endTime", mEndTime);
Log.v("i", String.valueOf(i));
Log.v("iswitch", String.valueOf(isRunning));
Log.v("endTime", String.valueOf(mEndTime));
isRunning = false;
for (int i = 0; i < record.size(); i++) {
editor.putString("record" + i, record.get(i));
}
editor.apply();
if (timeThreadd != false) {
timeThread.interrupt();
}
if (record.size() > 0) {
for (int i = 0; i < record.size(); i++) {
record.remove(i);
}
}
}
@Override
protected void onStart() {
super.onStart();
SharedPreferences sharedpreferences = getSharedPreferences("timer", MODE_PRIVATE);
i = sharedpreferences.getLong("time", 0);
isRunning = sharedpreferences.getBoolean("switch", isRunning);
int b = sharedpreferences.getInt("recordsize", 0);
for (int i = 0; i < b; i++) {
String c = sharedpreferences.getString("record" + i, null);
record.add(c);
mRecordTextView.setText(mRecordTextView.getText() + c + "\n");
}
if (isRunning) {
mEndTime = sharedpreferences.getLong("endTime", 0);
Log.v(" set mEndTime",String.valueOf(mEndTime));
i = System.currentTimeMillis() / 10 - mEndTime;
Log.v(" set i",String.valueOf(i));
if (i < 0) {
isRunning = false;
i = 0;
mEndTime = 0;
timeThreadd = false;
mRecordBtn.setVisibility(View.GONE);
mStartBtn.setVisibility(View.VISIBLE);
mPauseBtn.setVisibility(View.GONE);
mRecordTextView.setText("");
mTimeTextView.setText("00:00:00:00");
} else if (i > 0) {
mStartBtn.setVisibility(View.GONE);
mStopBtn.setVisibility(View.VISIBLE);
mRecordBtn.setVisibility(View.VISIBLE);
mPauseBtn.setVisibility(View.VISIBLE);
timeThread = new Thread(new timeThread());
timeThread.start();
}
}
}
}
解决方案
我解决问题。
public void run() {
if(timeThreadd!= true){
mEndTime = System.currentTimeMillis() / 10 + i;
timeThreadd = true;
}
问题是 System.currentTimeMillis()。
System.currentTimeMillis() 只需在用户按下开始按钮时存储一次。
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