每当我按下应用程序上的主页按钮然后再返回时，应用程序似乎已停止。我真的不知道为什么因为我还没有做任何事情。所以这意味着唯一被执行的是我的oncreate，onresume，onpause和destroy。我没有在onresume，onpause和destroy上做任何事情。尚未开始服务或只是在oncreate中加载和初始化数据。另一件事是，它没有崩溃，只是停止或关闭。没有错误。我将与您分享我的onCreate按钮。也许你会看到导致这种情况发生的原因。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.layout_landstar_page);
preferences = getSharedPreferences(pref_data, Context.MODE_PRIVATE);
alertDialogBuilder = new AlertDialog.Builder(this);
i = new Intent(this, BGService.class);
shipmentAvailableLayout = ((LinearLayout)findViewById(R.id.shipment_available_layout));
shipmentNotAvailableLayout = ((LinearLayout)findViewById(R.id.shipment_notavailable_layout));
menu = ((RelativeLayout)findViewById(R.id.menu));
declineBtn = ((Button)findViewById(R.id.declinebtn));
acceptBtn = ((Button)findViewById(R.id.acceptbtn));
callHelpDeskBtn = ((Button)findViewById(R.id.callhelpdeskbtn));
menuBtn = ((ImageView)findViewById(R.id.menubtn));
refreshBtn = ((ImageView)findViewById(R.id.refreshbtn));
logoutBtn = ((ImageView)findViewById(R.id.logoutbtn));
trackingMsgShipment = ((TextView)findViewById(R.id.tracking_message_shipment));
powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"MyWakeLock");
registerReceiver(broadcastReceiver, new IntentFilter(BGService.BROADCAST_ACTION));
final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
((Button)findViewById(R.id.acceptbtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
acceptBtn.setBackgroundResource(R.drawable.accept_selected);
if(event.getAction()==MotionEvent.ACTION_UP)
{
acceptBtn.setBackgroundResource(R.drawable.accept_idle);
if(isNetworkConnected())
{
acceptLoad();
}
else
noConnection();
}
return false;
}
});
((Button)findViewById(R.id.declinebtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
declineBtn.setBackgroundResource(R.drawable.decline_selected);
if(event.getAction()==MotionEvent.ACTION_UP)
{
declineBtn.setBackgroundResource(R.drawable.decline_idle);
declineLoad();
}
return false;
}
});
((Button)findViewById(R.id.callhelpdeskbtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
callHelpDeskBtn.setBackgroundResource(R.drawable.btn_refresh_selected);
if(event.getAction()==MotionEvent.ACTION_UP)
{
callHelpDeskBtn.setBackgroundResource(R.drawable.btn_refresh_idle);
if(isNetworkConnected())
{
displayProgressSpinner();
}
else
noConnection();
}
return false;
}
});
((ImageView)findViewById(R.id.menubtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
{
if(menu.isShown())
{
menu.setVisibility(View.GONE);
}
else
{
menu.setVisibility(View.VISIBLE);
}
}
return false;
}
});
((ImageView)findViewById(R.id.refreshbtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
{
menu.setVisibility(View.GONE);
if(isNetworkConnected())
displayProgressSpinner();
else
noConnection();
}
return false;
}
});
((ImageView)findViewById(R.id.logoutbtn)).setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN)
{
menu.setVisibility(View.GONE);
try{
checkerTimer.cancel();
gpsTimer.cancel();
counterTimer2.cancel();
}
catch (Exception e) {
e.printStackTrace();
}
Log.i("isAccept", preferences.getString("isAccepted",""));
alertDialogBuilder.setTitle("Message");
alertDialogBuilder
.setMessage("Clicking the log out button will stop your GPS and exit the application. Are you sure?")
.setCancelable(false)
.setNegativeButton("Logout",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
SharedPreferences.Editor editor = preferences.edit();
editor.putString("isDriverLogin", "True");
editor.putString("driverPassword", driverPassword);
editor.putString("carrierId", carrierId);
editor.putString("CCTID", cctid);
editor.putString("shipment", entityShipment);
editor.putString("isAccepted", "");
editor.commit();
getApplicationContext().stopService(i);
finish();
}
})
.setPositiveButton("Cancel",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
return false;
}
});
Intent intent = getIntent();
loadSaveDetails(intent);
}
我的宣言：
<?xml version="1.0" encoding="utf-8"?>
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<activity
android:name="com.nesv.landstar.SplashScreen"
android:label="@string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.nesv.landstar.Login"
android:label="@string/app_name"
android:screenOrientation="portrait">
</activity>
<activity
android:name="com.nesv.landstar.DriverLogin"
android:label="@string/app_name"
android:screenOrientation="portrait">
</activity>
<activity
android:name="com.nesv.landstar.LandstarPage"
android:label="@string/app_name"
android:screenOrientation="portrait">
</activity>
<service android:name="com.nesv.landstar.BGService"></service>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
有一件事，这不会发生在有根的三星s3和普通的三星s4上。在S duos版本4.0上尝试并降低到姜饼。这件事发生了。
另一个问题。我试着从日食中安装它。这没有发生。这只发生在我尝试安装来自设备上bin文件夹的apk文件时。
答案 0 :(得分：0)
覆盖onPause（），onStop（）和onDestroy（）（确保在每个中调用super.onXXX（））并在每个中放入一个日志语句，以查看系统是否决定销毁您的活动，例如：因为系统内存很低。如果确实如此，则在返回活动时需要再次调用onCreate（）。
开发工具＆＃39;应用程序有一个名为＆＃39;立即销毁活动的设置＆＃39;无论系统是否需要RAM，当您离开Activity时，它总会销毁一个Activity。
答案 1 :(得分：0)
尝试以下代码。
public class StartupActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (needStartApp()) {
Intent i = new Intent(StartupActivity.this, MainActivity.class);
startActivity(i);
}
finish();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
// this prevents StartupActivity recreation on Configuration changes
// (device orientation changes or hardware keyboard open/close).
// just do nothing on these changes:
super.onConfigurationChanged(null);
}
private boolean needStartApp() {
final ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
final List<RunningTaskInfo> tasksInfo = am.getRunningTasks(1024);
if (!tasksInfo.isEmpty()) {
final String ourAppPackageName = getPackageName();
RunningTaskInfo taskInfo;
final int size = tasksInfo.size();
for (int i = 0; i < size; i++) {
taskInfo = tasksInfo.get(i);
if (ourAppPackageName.equals(taskInfo.baseActivity.getPackageName())) {
// continue application start only if there is the only Activity in the task
// (BTW in this case this is the StartupActivity)
return taskInfo.numActivities == 1;
}
}
}
return true;
}
}
从此启动活动启动您的家庭活动。 在清单
<activity android:name=".StartupActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>