Question

我想为这个计时器制作一个毫秒的进度条，但它不起作用你能帮助我吗？也许它很简单，但如果点击开始（button1）

我的应用程序崩溃了

1：

 package com.example.stopwatch;

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity {


private CountDownTimer mCountDownTimer;
int i=0;
private ProgressBar pb;
private TextView textTimer;
private Button startButton;
private Button pauseButton;
private long startTime = 0L;
private Handler myHandler = new Handler();
long timeInMillies = 0L;
long timeSwap = 0L;
long finalTime = 0L;
int seconds = (int) (finalTime / 1000);
int minutes = seconds / 60;
int milliseconds = (int) (finalTime % 1000);

2：

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

textTimer = (TextView) findViewById(R.id.textView1);

startButton = (Button) findViewById(R.id.button1);
startButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startTime = SystemClock.uptimeMillis();
myHandler.postDelayed(updateTimerMethod, 0);

}
});

3：

pauseButton = (Button) findViewById(R.id.button2);
pauseButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
timeSwap += timeInMillies;
myHandler.removeCallbacks(updateTimerMethod);

}
});

}

private Runnable updateTimerMethod = new Runnable() {

public void run() {
timeInMillies = SystemClock.uptimeMillis() - startTime;
finalTime = timeSwap + timeInMillies;

seconds = seconds % 60;
int seconds = (int) (finalTime / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
int milliseconds = (int) (finalTime % 1000);
pb.setProgress(milliseconds);
textTimer.setText("" + minutes + ":" + String.format("%02d", seconds) + ":" + String.format("%03d", milliseconds));
myHandler.postDelayed(this, 0);

}



};

}

也许你可以帮助我。 Thx Jonah

Answer 1

你的应用程序正在崩溃，因为我想这行

pb.setProgress(milliseconds);

我看着它并清理了一下。现在这有一个用于textView的工作秒表。虽然有一个进度条在你的应用程序中无缘无故地运行。虽然我没有清楚地理解你的问题。希望这可以帮助您开始您的项目。

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.SystemClock;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{


private CountDownTimer mCountDownTimer;
int i=0;
private ProgressBar pb;
private TextView textTimer;
private Button startButton, pauseButton;
private long startTime = 0L;
private Handler myHandler = new Handler();
long timeInMillies = 0L;
long timeSwap = 0L;
long finalTime = 0L;
int seconds = (int) (finalTime / 1000);
int minutes = seconds / 60;
int milliseconds = (int) (finalTime % 1000);

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

    textTimer = (TextView) findViewById(R.id.textView1);
    pb = (ProgressBar) findViewById(R.id.progressBar); // here is the key
    startButton = (Button) findViewById(R.id.button1);
    pauseButton = (Button) findViewById(R.id.button2);

    startButton.setOnClickListener(this);
    pauseButton.setOnClickListener(this);
}

    @Override
    public void onClick(View v) {

        switch (v.getId()){
            case R.id.button1:
                startTime = SystemClock.uptimeMillis();
                myHandler.postDelayed(updateTimerMethod, 0);
                textTimer.setText("b1 here showing startTime" + startTime);
                break;
            case R.id.button2:
                timeSwap += timeInMillies;
                myHandler.removeCallbacks(updateTimerMethod);
                textTimer.setText("b2 showing timeSwap" + timeSwap);
                break;
    }


}

public Runnable updateTimerMethod = new Runnable() {

    public void run() {
        timeInMillies = SystemClock.uptimeMillis() - startTime;
        finalTime = timeSwap + timeInMillies;

        seconds = seconds % 60;
        int seconds = (int) (finalTime / 1000);
        int minutes = seconds / 60;
        seconds = seconds % 60;
        int milliseconds = (int) (finalTime % 1000);
        pb.setProgress(milliseconds);   // because you call this
        textTimer.setText("" + minutes + ":" + String.format("%02d", seconds) + ":" + String.format("%03d", milliseconds));
        myHandler.postDelayed(this, 0);

    }



};

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

计时器的进度条

1 个答案: