Java can';不要保存我的分数-android
首先,我是新手。 我正在制作一个应用程序,其中你有15秒的时间尽可能多地得分,然后我希望它保存你的最终得分,但我无法成功,以下是代码:Java can';不要保存我的分数-android,java,android,eclipse,Java,Android,Eclipse,首先,我是新手。 我正在制作一个应用程序,其中你有15秒的时间尽可能多地得分,然后我希望它保存你的最终得分,但我无法成功,以下是代码: package com.cannongaming.supertouch; import java.io.FileOutputStream; import java.util.concurrent.TimeUnit; import android.support.v7.app.ActionBarActivity; import android.annotati
package com.cannongaming.supertouch;
import java.io.FileOutputStream;
import java.util.concurrent.TimeUnit;
import android.support.v7.app.ActionBarActivity;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.os.CountDownTimer;
public class StartActivity<TextView>
extends ActionBarActivity
implements OnClickListener {
Button buttonTap, buttonLet;
TextView textScore, textTime;
int score=0;
byte[] scoreBytes;
String filename = "myscore";
int timer = 15000; // 1000 = 1 second
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
//1
buttonTap = (Button)findViewById(R.id.buttonTap);
buttonLet = (Button)findViewById(R.id.buttonLet);
textScore = (TextView)findViewById(R.id.textScore);
textTime = (TextView)findViewById(R.id.textTime);
scoreBytes[0] = (byte) score;
scoreBytes[1] = (byte) (score >> 8);
scoreBytes[2] = (byte) (score >> 16);
((android.widget.TextView) textTime).setText("00:00:15");
//2
((android.widget.TextView) textScore).setText(String.valueOf(score));
//3
buttonTap.setOnClickListener(this);
buttonLet.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
final CounterClass timer = new CounterClass(15000, 1000);
timer.start();
score++;
((android.widget.TextView) textScore).setText(String.valueOf(score));
view.setVisibility(View.GONE);
}});
}
public void onClick(View src){
switch(src.getId()){
case R.id.buttonTap:
score++;
((android.widget.TextView) textScore).setText(String.valueOf(score));
break;
}
}
public class CounterClass extends CountDownTimer {
public CounterClass(long millisInFuture, long countDownInterval){
super(millisInFuture, countDownInterval);
// TODO Auto-generated constructor stub
}
public void onTick(long millisUntilFinished){
long millis = millisUntilFinished;
String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
System.out.println(hms);
((android.widget.TextView) textTime).setText(hms);
}
@Override
public void onFinish() {
// TODO Auto-generated method stub
FileOutputStream outputStream = getApplicationContext().openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(scoreBytes);
outputStream.close();
Intent i = new Intent(getApplicationContext(), ScoreActivity.class);
startActivity(i);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.start, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
然后我将我的onFinish
更改为:
public void onFinish() {
// TODO Auto-generated method stub
try {
FileOutputStream outputStream = getApplicationContext().openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(scoreBytes);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
Intent i = new Intent(getApplicationContext(), ScoreActivity.class);
startActivity(i);
}
现在已经没有错误了,但当我打开我的应用程序时,它说它被迫关闭。请帮帮我 您通过放置捕获来减轻编译错误 您现在面临的问题肯定是
NullPointerException
只要您声明byte[]scoreBytes代码>,但不要在下面任何地方初始化它。这样做贴花,您将是一个例外:
byte[] scoreBytes = new byte[3];
编辑
现在有人建议:
- 适当地记录异常。我总是建议使用android工具来跟踪异常,而不是将异常转储到控制台。因此,我建议您替换重构解决方案的这一行:
e.printStackTrace();
对于这一点:
Log.e("TAG", "An exception while opoening the output file", e);
- 试着自己解决问题。查看Logcat中的stacktraces。logcat是Eclipse中最重要的android视图之一。如果默认情况下看不到它,请通过进入窗口->其他->android->Logcat来可视化它。它将显示代码中发生的ERORR(比如当前失败的事情)
您可以使用共享参考资料来实现这一点
了解更多关于它的信息
保存值
SharedPreferences.Editor editor = wmbPreference1.edit();
editor.putString("MYKEY", "12345");
editor.commit();
您可以像这样检索值
String Phonenumber = wmbPreference1.getString("MYKEY", "");
其中MYKEY是您可以识别值的键名。您可以将分数与SharedReferences一起保存在XML文件中。您不需要文件操作。SharedPreferences更高效。您有任何Logcat错误吗???如果我使用shared preferences,我以后可以加载它吗?
SharedPreferences.Editor editor = wmbPreference1.edit();
editor.putString("MYKEY", "12345");
editor.commit();
String Phonenumber = wmbPreference1.getString("MYKEY", "");