用整数更改进度条最大值

Question

在我的计时器应用程序中，有一个进度条来设置倒数时间。我设法使进度条随着倒数的进度移动，但现在我要这样做：每当我启动倒数计时时，进度条的最大值应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秒并开始计时，则进度条应跳到右侧，并从右向左显示进度。类似于三星标准时钟应用倒计时上的圆圈。我该如何处理？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进度条转换为全局整数progress，并使用它来定义timerSeekbar.setMax((int)progress) 但是我应该在哪里设置这一行代码以使其正常工作？

Answer 1

尝试下面的代码，它可以工作。重置时，必须将setProgress设置为最大值。在这里，timertextview和seekbarmax应该匹配以获得正确的结果。另外，CountDownTimer构造函数应类似于以下示例。

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，在这里您必须删除静态值（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。