Question

首先请原谅我的英语，但我认为这是可以理解的。所以在这个应用程序中是一个计数器，我需要它在达到例如30秒时发出声音。注意：这是我的第一个问题，所以如果我违反任何规则或者我可以提出更好的方式，请告诉我

import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;

public class MainActivity extends AppCompatActivity {

    private Button mStartButton;
    private Button mPauseButton;
    private Button mResetButton;
    private Chronometer mChronometer;

    private long lastPause;

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

        mStartButton = (Button) findViewById(R.id.start_button);
        mPauseButton = (Button) findViewById(R.id.pause_button);
        mResetButton = (Button) findViewById(R.id.reset_button);
        mChronometer = (Chronometer) findViewById(R.id.chronometer);

        mStartButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (lastPause != 0){
                    mChronometer.setBase(mChronometer.getBase() + SystemClock.elapsedRealtime() - lastPause);
                }
                else{
                    mChronometer.setBase(SystemClock.elapsedRealtime());
                }

                mChronometer.start();
                mStartButton.setEnabled(false);
                mPauseButton.setEnabled(true);
            }
        });

        mPauseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                lastPause = SystemClock.elapsedRealtime();
                mChronometer.stop();
                mPauseButton.setEnabled(false);
                mStartButton.setEnabled(true);
            }
        });

        mResetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mChronometer.stop();
                mChronometer.setBase(SystemClock.elapsedRealtime());
                lastPause = 0;
                mStartButton.setEnabled(true);
                mPauseButton.setEnabled(false);
            }
        });
    }
}

Answer 1

将全局整数变量定义为计数器，并在Chronometer＆＃39; s OnChronometerTickListener中计算，当它达到例如30时，然后播放声音并重置计数器：

int c = -1; // define global

chronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
    @Override
    public void onChronometerTick(Chronometer chronometer) {
        c++;
        if(c == 30) {
            c = 0;
            MediaPlayer mp = MediaPlayer.create(getApplicationContext(), R.raw.ding);
            mp.start();
        }
    }
});

计数器到达特定时间时发出声音Android的

1 个答案: