我有一个从60000毫秒开始的倒数计时器，并希望在时间为10000毫秒时将文本颜色从Color.BLUE更改为Color.RED。我没有成功地尝试过以下几点;尝试设置TextSwitcher的TextTolor并添加将根据int值timerState改变颜色的IF语句。我不知道如何使其工作除了可能停止计时器并创建另一个一毫秒UntilFinished达到10000实际领先到我的第二个问题：
我点击了一个imageButton，它启动了一个对话框片段（PauseFragment），并通过timerCDT.cancel（）在我的CountDownTimer上调用cancel（）。我遇到了一些nullpointer问题，因此if语句在我的代码中检查null，但是现在一旦PauseFragment解散我的新计时器就会从60000开始，而不是最后一次停止。我希望long timerState = 60000会更新到每次onTick（）被调用的millisUntilFinished但是我不确定我哪里出错了！
因此，有人可以帮助我动态更改TextSwitcher文本颜色，并协助弄清楚为什么我的CountDownTimer不会从预期值开始。非常感谢任何帮助。
提前感谢！
public class GameActivity extends FragmentActivity implements PauseFragment.FragmentCommunicator,{
public static long timerState = 60000;
public static boolean isTimerOn = false;
private String modeChoice = ModesActivity.mode;
private TextSwitcher timerTextSwitcher;
CountDownTimer timerCDT;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//...more code
timerTextSwitcher = (TextSwitcher) findViewById(R.id.timerTextSwitcher);
timerTextSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
public View makeView() {
// Create a new TextView and set properties
TextView textView = new TextView(getApplicationContext());
textView.setLayoutParams(new TextSwitcher.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
textView.setTextSize(20);
textView.setTextColor(Color.BLUE);
if (timerState < 10001) {
textView.setTextColor(Color.RED);
}
return textView;
}
});
// Declare the animations and initialize them
Animation in = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
Animation out = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
// set the animation type to textSwitcher
timerTextSwitcher.setInAnimation(in);
timerTextSwitcher.setInAnimation(out);
}
timerCDT = new CountDownTimer(timerState, 1000) {
public void onTick(long millisUntilFinished) {
isTimerOn = true;
timerTextSwitcher.setText(String.valueOf(millisUntilFinished / 1000));
timerState = millisUntilFinished;
}
//TODO: assign highscores for players to beat
public void onFinish() {
timerTextSwitcher.post(new Runnable() {
@Override
public void run() {
createToast("GAME OVER!");
}
});
isTimerOn = false;
DialogFragment endDialog = new EndGameFragment();
endDialog.show(getSupportFragmentManager(), "EndGameDialogFragment");
}
};
timerCDT.start();
@Override
public void onPause() {
super.onPause();
Bundle args = new Bundle();
args.putInt(ARG_SCORE, scoreINT);
args.putLong(ARG_TIMER, timerState);
args.putString(GameActivity.ARG_MODE, modeChoice);
if (timerCDT != null) {
timerCDT.cancel();
}
else{
createToastExtended("onPause() - timerCDT is null; attempt to cancel");
}
}
//.!.other fun code here.!.
@Override
protected void onStop() {
super.onStop();
if (timerCDT != null) {
timerCDT.cancel();
}
else{
createToastExtended("onStop() - timerCDT is null; attempt to cancel");
}
}
//Player Response information
@Override
public void pauseFragmentResponse() {
if (timerCDT != null) {
timerCDT.start();
}
else{
createToastExtended("pauseFragmenResponse() - timerCDT is null; attempt to start");
}
}
public void pauseStartFrag(View view) {
DialogFragment dialog = new PauseFragment();
if (timerCDT != null) {
timerCDT.cancel();
}
else{
createToastExtended("pauseStartFrag() - timerCDT is null;attempt to cancel");
}
dialog.show(getSupportFragmentManager(), "PauseDialogFragment");
}
// Code for PauseFragment
//TODO: remove unuses imports on all files within project;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
public class PauseFragment extends DialogFragment {
public static boolean isPaused = false;
public FragmentCommunicator fComm;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
fComm = (FragmentCommunicator) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement FragmentCommunicator");
}
}
@Override
public void onDetach() {
super.onDetach();
fComm = null;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
isPaused = true;
// Use the Builder class for convenient dialog construction
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
builder.setView(inflater.inflate(R.layout.fragment_pause, null))
.setMessage(R.string.dialog_pause)
.setPositiveButton(R.string.action_main_menu, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent i4 = new Intent(getActivity(), StartActivity.class);
startActivity(i4);
}
})
.setNeutralButton(R.string.action_restart, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent i4 = new Intent(getActivity(), ModesActivity.class);
startActivity(i4); }
})
.setNegativeButton(R.string.action_resume, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
fComm.pauseFragmentResponse();
dismiss();
}
});
// Create the AlertDialog object and return it
return builder.create();
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
isPaused = false;
}
public interface FragmentCommunicator {
public void pauseFragmentResponse();
}
}
最后，Idk如果有任何帮助，但我也尝试启动CountDownTimer timerCDT而没有FragmentCommunicator接口，但系统无法找到计时器？如果有人能够了解为什么会发生这种情况，我也会感激它。
说真的，最后一件事，如果计时器适用于游戏并且需要经常停止和更新，最好是使用CountDownTimer，TimerTask，实现Runnable的newThread还是处理程序或某种类型？我已经尝试了所有这些但是当我向应用程序添加组件和功能时，我需要更多的灵活性来改变时间，并且不太确定我是否走上了正确的道路。希望这篇文章不要太模糊。如果我需要分成多个帖子或其他东西，请告诉我......
一如既往地谢谢！
答案 0 :(得分：2)
在这里看一下开发者网站http://developer.android.com/reference/android/os/CountDownTimer.html，看起来你可能应该在onTick方法中放置if语句，所以对于每个tick都要进行检查。
修改
好的，这对我来说很完美
private TextSwitcher TextSw;
private TextView TextSwTextView;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(com.game.test.R.layout.sample);
TextSw = (TextSwitcher) findViewById(R.id.TextSwitchView);
TextSw.setFactory(new ViewSwitcher.ViewFactory()
{
public View makeView()
{
// Create a new TextView and set properties
TextView textView = new TextView(getApplicationContext());
textView.setLayoutParams(new TextSwitcher.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
textView.setTextSize(20);
textView.setTextColor(Color.BLUE);
return textView;
}
});
mtimer = new CountDownTimer(60000, 1000)
{
public void onTick(long millisUntilFinished)
{
TextSwTextView = (TextView) TextSw.getChildAt(0);
if(millisUntilFinished < 10001)
TextSwTextView.setTextColor(Color.RED);
TextSwTextView.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish()
{
TextSwTextView.setText("done!");
}
}.start();
}
所以上面是你的简单版本，当计时器达到1000时，显示计时器的文本将变为红色。你应该可以将它构建到你的。
但你要做的主要是检查计时器在onTick方法中剩余多少，并将此处的文本颜色更改为 - 见上文
答案 1 :(得分：1)
这个帖子帮助我更轻松地解决了我的问题：
https://groups.google.com/forum/#!topic/android-developers/jdlUp_RlP2w
你可以像这样对textSwitcher中的textviews进行处理：
TextView t1 = (TextView) mSwitcher.getChildAt(0);
TextView t2 = (TextView) mSwitcher.getChildAt(1);
然后根据代码逻辑设置所需的颜色。
答案 2 :(得分：0)
TextView t1，t2;
textSwitcher = (TextSwitcher) findViewById(R.id.textView99);
textSwitcher.setInAnimation(this, R.anim.slide_in_right);
textSwitcher.setOutAnimation(this, R.anim.slide_out_left);
t1 = new TextView(this);
t2 = new TextView(this);
t1.setTextSize(20);
t2.setTextSize(20);
textSwitcher.addView(t1);
textSwitcher.addView(t2);