Question

我有一个30秒的倒数计时器，它会在应用程序打开时启动。

每次此计时器开始和结束时，我都想显示新的活动。

我怎么能这样做？

Answer 1

首先开始Timer 30秒。计时器的Onfinish方法更新shared prefferences中完成计时器的次数。这是完整的代码。

首先定义

public static final String MyPREFERENCES = "MyPrefs" ;
SharedPreferences sharedpreferences;

并在activity或fragment

的onCreate中

sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);

现在制作你的计时器

int oneMin= 30 * 1000; // 30 seconds in milli seconds

    /** CountDownTimer starts with 30 seconds and every onTick is 1 second */
    CountDownTimer cdt = new CountDownTimer(oneMin, 1000) {


        public void onTick(long millisUntilFinished) {
            Log.e("timer","time");
            // this method is invoke in every 1 second (1000 milli second )
        }

        public void onFinish() {
            // you can also check here how many times this timer have been finished in past
            // this method will invoke after completion that is 30 seconds
            Intent intent = new Intent (context, NewActivity.class);
            context.startActivity(intent);
            // you can save in SHARED PREFFERENCES and update how many times this method is invoked.
            SharedPreferences.Editor editor = sharedpreferences.edit();
            int times = sharedpreferences.getInt("times",0);
            editor.putInt("times",times);
            editor.commit();
        }
    }.start();

Answer 2

new CountDownTimer(30000, 1000) {

    public void onTick(long millisUntilFinished) {
        mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
       //here you can have your logic to set text to edittext
    }

    public void onFinish() {
        mTextField.setText("done!");
        //start new activity here
        Intent intent=new Intent(getApplicationContext(),NewActivityName.class);
        startActivity(intent)
    }

}.start();

Answer 3

为此你应该有两个Activities

MainActivity：启动器活动

TempActivity： Temp Activity 30秒

默认情况下，

TimeFlag为false，因此您将直接发送到TempActivity所在的位置30秒，然后TimeFlag将变为真，并且MainActivity设置内容。< / p>

<强> MainActivity：

public class MainActivity extends Activity {

    public static boolean TimeFlag = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    protected void onResume() {
        super.onResume();
        if (!TimeFlag) {
            Intent intent = new Intent(this, TempActivity.class);
            startActivity(intent);
        } else {
            setContentView(R.layout.activity_main);
            // your other task here below
        }
    }
}

<强> TempActivity：

public class TempActivity extends Activity {

    public static final int Tick = 1000;
    public static final int Complete = 30000; // 30 seconds

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


        CountDownTimer timmer = new CountDownTimer(Complete, Tick) {

            public void onTick(long millisUntilFinished) {
                Log.e("timer", "time");
                // this method is invoke in every 1 second (1000 milli second )
            }

            public void onFinish() {
                MainActivity.TimeFlag = true;
                finish();
            }
        }.start();
    }
}

如何知道Coundown计时器在android中启动和完成的次数？

3 个答案: