我的第一个stackoverflow帖子。
我在Play商店有一个免费的评分应用程序已经有一年了，但是一位用户最近指出，当手机进入睡眠状态时，分数会重置为零。他是对的。从我读过的内容来看，我猜我的问题与savedInstanceState有关。
增加/减少分数的实际代码位于savedInstanceState之外......但每当我尝试解决这个问题时，我都会收到错误。在我走这条路之前，我想我最好让专家们参与其中。事先谢谢。
我的代码：
package com.estrellastudios.rally.point.free;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Typeface;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;
public class KeepScore extends Activity implements OnClickListener {
// declare a few variables on outer side of code
TextView tvhs, tvvs, tvho, tvvo;
ImageButton homeAddButton, homeSubtractButton,
visitorAddButton, visitorSubtractButton;
Button reset;
int scoreH;
int scoreV;
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.keepscore);
//declare all the buttons
homeAddButton = (ImageButton)findViewById(R.id.home_add_button);
visitorAddButton = (ImageButton)findViewById(R.id.visitor_add_button);
homeSubtractButton = (ImageButton)findViewById(R.id.home_subtract);
visitorSubtractButton = (ImageButton)findViewById(R.id.visitor_subtract);
reset = (Button) findViewById(R.id.reset);
// declare the home & visitor scores
tvhs = (TextView)findViewById(R.id.home_score);
tvvs = (TextView)findViewById(R.id.visitor_score);
// declare the home & visitor teams
TextView tvho = (TextView)findViewById(R.id.home_output);
TextView tvvo = (TextView)findViewById(R.id.visitor_output);
tvho.setText(getIntent().getExtras().getString("homeText"));
tvvo.setText(getIntent().getExtras().getString("visitorText"));
homeAddButton.setOnClickListener((OnClickListener) this);
homeSubtractButton.setOnClickListener((OnClickListener) this);
visitorAddButton.setOnClickListener((OnClickListener) this);
visitorSubtractButton.setOnClickListener((OnClickListener) this);
// ChunkFive
// team name styling and output here
Typeface Chunkfive = Typeface.createFromAsset(getAssets(), "fonts/Chunkfive.ttf");
tvho.setTypeface(Chunkfive);
//tvho.setTextSize(29.f);
tvvo.setTypeface(Chunkfive);
//tvvo.setTextSize(29.f);
// ChunkFive
// Scoring styling and output here
tvhs.setTypeface(Chunkfive);
//tvhs.setTextSize(120.f);
tvvs.setTypeface(Chunkfive);
//tvvs.setTextSize(120.f);
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
}
// start view
public void onClick(View v) {
boolean showTextH = false;
boolean showTextV = false;
// start switch case
if(scoreH==0 && scoreV > 0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
//case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else if(scoreV==0 && scoreH > 0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
//case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else if(scoreV==0 && scoreH==0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
//case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
//case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else {
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
// reset button
reset.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
scoreH = 0;
scoreV = 0;
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
}
});
//end reset button
} // end public void onClick
@Override
protected void onPause() {
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
super.onPause();
}
@Override
protected void onResume() {
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
super.onResume();
}
}
答案 0 :(得分：0)
我并非100％肯定，但我的猜测是，当手机进入睡眠状态时，您的活动正在被破坏，并且当手机重新打开时会重新创建。每次在其中一个分数更改时，我会将分数存储在共享首选项中，然后在onCreate方法中从“共享首选项”中恢复这些值。请注意，这将恢复使用的最后一个值，即使它是一个新游戏，所以你不会再用一些逻辑来处理这个。在你这样做之前，在你的onCreate中添加一个Log.d来查看这是否正在发生，但仍然只是为了安全起见。一旦应用程序处于后台，您将无法保证活动将保留在内存中。 http://developer.android.com/guide/topics/data/data-storage.html
修改
这是您的代码更新了一些日志调试输出，以便您可以开始了解LogCat中发生的事情：
package com.estrellastudios.rally.point.free;
import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
public class KeepScore extends Activity implements OnClickListener {
// Instance Variables
TextView tvhs, tvvs, tvho, tvvo;
ImageButton homeAddButton, homeSubtractButton,
visitorAddButton, visitorSubtractButton;
Button reset;
int scoreH;
int scoreV;
private static final String TAG = KeepScore.class.getSimpleName();
@Override
public void onCreate(Bundle savedInstanceState) {
/*
* Now you can see every time the onCreate Method
* is called. The onCreate method is called only when
* the activity is created. So if this gets called instead
* of onResume then you now that this activity has been removed
* from memory and is being recreated.
*/
Log.d(TAG, "onCreate Method Called");
super.onCreate(savedInstanceState);
setContentView(R.layout.keepscore);
//declare all the buttons
homeAddButton = (ImageButton)findViewById(R.id.home_add_button);
visitorAddButton = (ImageButton)findViewById(R.id.visitor_add_button);
homeSubtractButton = (ImageButton)findViewById(R.id.home_subtract);
visitorSubtractButton = (ImageButton)findViewById(R.id.visitor_subtract);
reset = (Button) findViewById(R.id.reset);
// declare the home & visitor scores
tvhs = (TextView)findViewById(R.id.home_score);
tvvs = (TextView)findViewById(R.id.visitor_score);
// declare the home & visitor teams
TextView tvho = (TextView)findViewById(R.id.home_output);
TextView tvvo = (TextView)findViewById(R.id.visitor_output);
tvho.setText(getIntent().getExtras().getString("homeText"));
tvvo.setText(getIntent().getExtras().getString("visitorText"));
homeAddButton.setOnClickListener((OnClickListener) this);
homeSubtractButton.setOnClickListener((OnClickListener) this);
visitorAddButton.setOnClickListener((OnClickListener) this);
visitorSubtractButton.setOnClickListener((OnClickListener) this);
// ChunkFive
// team name styling and output here
Typeface Chunkfive = Typeface.createFromAsset(getAssets(), "fonts/Chunkfive.ttf");
tvho.setTypeface(Chunkfive);
//tvho.setTextSize(29.f);
tvvo.setTypeface(Chunkfive);
//tvvo.setTextSize(29.f);
// ChunkFive
// Scoring styling and output here
tvhs.setTypeface(Chunkfive);
//tvhs.setTextSize(120.f);
tvvs.setTypeface(Chunkfive);
//tvvs.setTextSize(120.f);
Log.d(TAG, "Home team score in onCreate: " + scoreH);
tvhs.setText(String.valueOf(scoreH));
Log.d(TAG, "Vistor team score in onCreate: " + scoreV);
tvvs.setText(String.valueOf(scoreV));
}
// start view
public void onClick(View v) {
boolean showTextH = false;
boolean showTextV = false;
// start switch case
if(scoreH==0 && scoreV > 0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
//case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else if(scoreV==0 && scoreH > 0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
//case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else if(scoreV==0 && scoreH==0){
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
//case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
//case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
else {
switch(v.getId())
{
case R.id.home_add_button: scoreH++; showTextH = true; break;
case R.id.home_subtract: scoreH--; showTextH = true; break;
case R.id.visitor_add_button: scoreV++; showTextV = true; break;
case R.id.visitor_subtract: scoreV--; showTextV = true; break;
}
if(showTextH)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
if(showTextV)
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
// end switch case
}
// reset button
reset.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
scoreH = 0;
scoreV = 0;
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
}
});
//end reset button
} // end public void onClick
@Override
protected void onPause() {
/*I do no see the point in setting your
* score text views to the score values when
* they are already set. I would remove these
* 2 lines of code.
*/
tvhs.setText(String.valueOf(scoreH));
tvvs.setText(String.valueOf(scoreV));
super.onPause();
}
@Override
protected void onResume() {
Log.d(TAG, "Home team score in onResume: " + scoreH);
tvhs.setText(String.valueOf(scoreH));
Log.d(TAG, "Vistor team score in onResume: " + scoreV);
tvvs.setText(String.valueOf(scoreV));
super.onResume();
}
}