我创建了一个Android应用程序。它运行得很好。但我遇到了一个问题。我搜索了很多但是找不到合适的答案。
问题是我的应用程序崩溃了几个小时后打开它（3-4小时后）。如果我重新启动应用程序，它会很顺利。否则它会崩溃。我的代码是：
MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar bar=getSupportActionBar();
bar.hide();
setContentView(R.layout.activity_dashboard);
buttonCount=0;
Button buttonLoc=(Button)findViewById(R.id.buttonLocation);
buttonLoc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,SearchMaps.class);
int s=Landingpage.hospital_list.size();
if(s!=0)
{
startActivity(i);
}
else
Toast.makeText(getApplicationContext(), "Check Internet Connection", Toast.LENGTH_SHORT).show();
finish();
}
});
button1=(Button)findViewById(R.id.buttonHosp);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,DoctorsActivity.class);
int s=Landingpage.hospital_list.size();
if(s!=0)
{
startActivity(i);
}
else
Toast.makeText(getApplicationContext(), "Check Internet Connection", Toast.LENGTH_SHORT).show();
finish();
}
});
buttonDoctors=(Button)findViewById(R.id.buttonDoctor);
buttonDoctors.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,Search_doctors.class);
int s=Landingpage.hospital_list.size();
if(s!=0)
{
startActivity(i);
}
else
Toast.makeText(getApplicationContext(), "Check Internet Connection", Toast.LENGTH_SHORT).show();
finish();
}
});
buttontime=(Button)findViewById(R.id.buttontime);
buttontime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,SearchingByTime.class);
int s=Landingpage.hospital_list.size();
if(s!=0)
{
startActivity(i);
}
else
Toast.makeText(getApplicationContext(), "Check Internet Connection", Toast.LENGTH_SHORT).show();
finish();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.dashboard, menu);
getMenuInflater().inflate(R.menu.dashboard, menu);
return true;
}
public void onResume()
{
super.onResume();
buttonCount=0;
button1=(Button)findViewById(R.id.buttonHosp);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,DoctorsActivity.class);
startActivity(i);
}
});
buttonDoctors=(Button)findViewById(R.id.buttonDoctor);
buttonDoctors.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,Search_doctors.class);
startActivity(i);
finish();
}
});
buttontime=(Button)findViewById(R.id.buttontime);
buttontime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
i=new Intent(DashboardActivity.this,SearchingByTime.class);
int s=Landingpage.hospital_list.size();
if(s!=0)
{
startActivity(i);
}
else
Toast.makeText(getApplicationContext(), "Check Internet Connection", Toast.LENGTH_SHORT).show();
}
});
}
@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.help) {
onHelp();
return true;
}
if (id == R.id.About) {
new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("About Us")
.setMessage("DocDig is an app that lets you find doctors in Islamabad "
+ "\n\n\n Sponsored By Code for Pakistan")
.setPositiveButton("Ok", null).setInverseBackgroundForced(true).show();
return true;
}
return super.onOptionsItemSelected(item);
}
public void onHelp() {
new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("Help")
.setMessage("DocDig is an app that lets you find doctors in Islamabad "
+ "through following options..\n\n"
+ "1. Search By Doctor -- In this option you would enter the Hospital name and "
+ "the name of the doctor and the gender and the details of that doctor would be shown\n\n"
+ "2. Search By Time -- You would select the hospital name, speciality, gender and the required date and time "
+ "and all the doctors of that category will be shown\n\n"
+ "3. Search By Hospital -- In this option, you would enter the hospital name, speciality and gender and the "
+ "list of doctors would be shown")
.setPositiveButton("Okay, Got it", null).show();
}
public Animation inFromRightAnimation()
{
Animation inFromRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, +1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
inFromRight.setDuration(240);
inFromRight.setInterpolator(new AccelerateInterpolator());
return inFromRight;
}
public Animation outToRightAnimation()
{
Animation outtoLeft = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f);
outtoLeft.setDuration(240);
outtoLeft.setInterpolator(new AccelerateInterpolator());
return outtoLeft;
}
public void onBackPressed()
{
if(buttonCount >= 1)
{
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
//finish();
}
else
{
Toast.makeText(this, "Press the back button once again to close the application.", Toast.LENGTH_SHORT).show();
buttonCount++;
}
}