我正在創建一個番茄鐘計時器應用程式。它有2個活動：
- 主要活動是設定時間。
- 最近的活動包含最近設定的時間。
我創建了一個Shared Preferences保存設定時間的物件，我希望這些時間顯示在“最近活動”的按鈕中。但是，似乎沒有保存資料，而是顯示了包名稱。
主要活動
package com.example.pomotimer;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
import java.util.Locale;
public class Activity2 extends AppCompatActivity {
public static final String EXTRA_TEXT = "com.example.pomotimer.EXTRA_TEXT";
private TextView TextViewCountdown;
private Button Button_Start_Pause;
private Button Reset;
SharedPreferences sp;
private Button buttonSet;
private Button select_Time;
private EditText edit_Text_Input;
private CountDownTimer countDownTimer;
public long mStartTimeinMillis;
private long timeLeft = mStartTimeinMillis;
private boolean timerRunning;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);
TextViewCountdown = findViewById(R.id.textViewCount);
Button_Start_Pause = findViewById(R.id.bnStartPause);
Reset = findViewById(R.id.reset);
select_Time = findViewById(R.id.selectTime);
edit_Text_Input = findViewById(R.id.edit_Text_Input);
buttonSet = findViewById(R.id.buttonSet);
sp = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
select_Time.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
edit_Text_Input.setVisibility(View.VISIBLE);
buttonSet.setVisibility(View.VISIBLE);
buttonSet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String input = edit_Text_Input.getText().toString();
if (input.length() == 0){
Toast.makeText(Activity2.this, "Field can't be empty", Toast.LENGTH_SHORT).show();
return;
}
long millisInput = Long.parseLong(input)*60000;
if (millisInput == 0){
Toast.makeText(Activity2.this, "Timer cannot be set to 0", Toast.LENGTH_SHORT).show();
return;
}
setTime(millisInput);
edit_Text_Input.setText("");
}
});
}
});
Button_Start_Pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (timerRunning){
pauseTimer();
}
else{
startTimer();
}
}
});
Reset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
resetTimer();
}
});
int minutes = (int) (timeLeft/1000)/60;
int seconds = (int) (timeLeft/1000)%60;
String timeLeftFormatted = String.format(Locale.getDefault(),"d:d", minutes, seconds);
TextViewCountdown.setText(timeLeftFormatted);
}
@Override
public void finish() {
super.finish();
overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
}
public void setTime(long milliseconds){
mStartTimeinMillis = milliseconds;
resetTimer();
SP();
}
private void startTimer(){
countDownTimer = new CountDownTimer(timeLeft,1000) {
@Override
public void onTick(long millisUntilFinished) {
// The countdown timer has an automatic method of reducing time by 1s
timeLeft = millisUntilFinished;
int minutes = (int) (timeLeft/1000)/60;
int seconds = (int) (timeLeft/1000)%60;
String timeLeftFormatted = String.format(Locale.getDefault(),"d:d", minutes, seconds);
TextViewCountdown.setText(timeLeftFormatted);
}
@Override
public void onFinish() {
timerRunning = false;
Button_Start_Pause.setText("Start");
Button_Start_Pause.setVisibility(View.INVISIBLE);
}
}.start();
timerRunning = true;
Button_Start_Pause.setText("pause");
}
int data = (int) timeLeft;
private void pauseTimer(){
countDownTimer.cancel();
timerRunning = false;
Button_Start_Pause.setText("Start");
}
private void resetTimer(){
timeLeft = mStartTimeinMillis;
int minutes = (int) (timeLeft/1000)/60;
int seconds = (int) (timeLeft/1000)%60;
Button_Start_Pause.setVisibility(View.VISIBLE);
String timeLeftFormatted = String.format(Locale.getDefault(),"d:d", minutes, seconds);
TextViewCountdown.setText(timeLeftFormatted);
}
@Override
protected void onStop() {
super.onStop();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putLong("millisleft", timeLeft);
editor.putBoolean("timerRunning", timerRunning);
editor.apply();
}
@Override
protected void onStart() {
super.onStart();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
timeLeft = prefs.getLong("millisleft",mStartTimeinMillis);
timerRunning = prefs.getBoolean("timeRunning", false);
int minutes = (int) (timeLeft/1000)/60;
int seconds = (int) (timeLeft/1000)%60;
String timeLeftFormatted = String.format(Locale.getDefault(),"d:d", minutes, seconds);
TextViewCountdown.setText(timeLeftFormatted);
}
public void SP() {
String data = TextViewCountdown.toString();
SharedPreferences.Editor editor = sp.edit();
editor.putString("time", data);
editor.commit();
Toast.makeText(Activity2.this, "this ", Toast.LENGTH_SHORT).show();
}
}
最近活動
package com.example.pomotimer;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;
public class recentActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recent);
Button button = findViewById(R.id.button_data);
// String number = getIntent().getStringExtra("keydata");
// button.setText(number);
SharedPreferences sp = getApplicationContext().getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
String time = sp.getString("time", "");
button.setText(time);
}
}
uj5u.com熱心網友回復：
而不是String data = TextViewCountdown.toString();它應該是String data = TextViewCountdown.getText().toString();
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/396132.html
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