用整数更改进度条最大值

Question

在我的计时器应用中，有一个进度条可以设置倒计时的时间。我设法让进度条随着倒计时的进度移动，但现在我想做这个：每当我开始倒计时，进度条最大值应该设置为计时器整数的值。所以例如如果我将倒计时设置为 30 秒并启动它，我的进度条应该会跳到右侧并显示从右到左的进度。类似于三星标准时钟应用倒计时的圆圈。我该如何管理？我希望你明白我的意思。

public class MainActivity extends AppCompatActivity {

    SeekBar timerSeekbar;
    TextView timertextview;
    boolean counteractiv = false;
    Button gobutton;
    CountDownTimer countDownTimer;
    int progress;

    public void resetTimer(){

        countDownTimer.cancel();
        timertextview.setText("0:30");
        timerSeekbar.setEnabled(true);
        counteractiv = false;
        gobutton.setText("Start");
        timerSeekbar.setMax(600);
        timerSeekbar.setProgress(30);

    }

    public void buttonclicked(View view){

        if(counteractiv){
            resetTimer();
        }else{
            //timerSeekbar.setMax((int)secondsleft);
            counteractiv = true;
            timerSeekbar.setEnabled(false);
            gobutton.setText("Stop!");

            countDownTimer = new CountDownTimer(timerSeekbar.getProgress() * 1000, 1000){

                @Override
                public void onTick(long l) {
                    updatetimer((int)l/1000);

                    timerSeekbar.setProgress((int)l/1000);
                }

                @Override
                public void onFinish() {
                    Toast.makeText(MainActivity.this, "Time over!", Toast.LENGTH_LONG).show();
                    gobutton.setText("Reset");
                }
            }.start();

            timerSeekbar.setMax((int)progress/1000);
        }

    }

    public void updatetimer(int secondsleft){

        int minutes = secondsleft/60;
        int seconds = secondsleft - (minutes*60);

        String secondsString = Integer.toString(seconds);
        String minutesString = Integer.toString(minutes);

        if(seconds <=9){
            secondsString = "0" + secondsString;
        }

        timertextview.setText(minutesString + ":" + secondsString);
        timerSeekbar.setProgress(secondsleft);

        progress = secondsleft;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        timerSeekbar = findViewById(R.id.seekBar);
        timertextview = findViewById(R.id.CountdowntextView);
        gobutton = findViewById(R.id.StartButton);

        timerSeekbar.setMax(600);
        timerSeekbar.setProgress(30);

        timerSeekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                updatetimer(i);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }
}

所以基本上我已经尝试将条形的进度转换为全局整数progress 并使用它来定义timerSeekbar.setMax((int)progress) 但是我在哪里设置这行代码才能让它正常工作呢？

Answer 1

试试下面的代码，它可以工作。重置时，您必须将 setProgress 设置为最大值。这里 timertextview 和 seekbarmax 应该匹配以获得正确的结果。 CountDownTimer 的构造函数也应该像下面的例子。

public class TestActivity extends AppCompatActivity {

    SeekBar timerSeekbar;
    TextView timertextview;
    boolean counteractiv = false;
    Button gobutton;
    CountDownTimer countDownTimer;
    int progress;

    public void resetTimer() {
        countDownTimer.cancel();
        timertextview.setText("0:30");
        timerSeekbar.setEnabled(true);
        counteractiv = false;
        gobutton.setText("Start");
        timerSeekbar.setMax(30);
        timerSeekbar.setProgress(30);
    }

    public void buttonclicked(View view) {

        if (counteractiv) {
            resetTimer();
        } else {
            //timerSeekbar.setMax((int)secondsleft);
            counteractiv = true;
            // timerSeekbar.setEnabled(false);
            gobutton.setText("Stop!");
            countDownTimer = new CountDownTimer(30 * 1000, 1000) {
                @Override
                public void onTick(long l) {
                    updatetimer((int) l / 1000);
                }

                @Override
                public void onFinish() {
                    Toast.makeText(EthopiaActivity.this, "Time over!", Toast.LENGTH_LONG).show();
                    gobutton.setText("Reset");
                }
            }.start();
        }
    }

    public void updatetimer(int secondsleft) {

        int minutes = secondsleft / 60;
        int seconds = secondsleft - (minutes * 60);

        String secondsString = Integer.toString(seconds);
        String minutesString = Integer.toString(minutes);

        if (seconds <= 9) {
            secondsString = "0" + secondsString;
        }

        timertextview.setText(minutesString + ":" + secondsString);
        timerSeekbar.setProgress(secondsleft);
        progress = secondsleft;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        timerSeekbar = findViewById(R.id.seekBar);
        timertextview = findViewById(R.id.CountdowntextView);
        gobutton = findViewById(R.id.StartButton);
        timerSeekbar.setMax(30);
        timerSeekbar.setProgress(1);

        timerSeekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                updatetimer(i);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }
}

xml 看起来像这样，这里你必须删除静态值（最大值和进度）

<SeekBar
    android:id="@+id/seekBar"
    style="@style/Widget.AppCompat.SeekBar.Discrete"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_alignParentEnd="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginEnd="5dp"
    android:layout_marginStart="-5dp"
    android:layout_marginTop="28dp" />

祝你好运。