android--Multithreaded Programming Exercises

Choose from two cities as a pre-selected destination. The implementation of two separate threads display 10 city names, each time after each display sleep a random time (within 1000ms), which first displayed, decided to go to which city. Implemented using the Runnable interface and the thread class, respectively.

Layout file:

1 <?XML version= "1.0" encoding= "Utf-8"?>2 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Xmlns:tools= "Http://schemas.android.com/tools"4 Android:layout_width= "Match_parent"5 Android:layout_height= "Match_parent"6 Android:paddingbottom= "@dimen/activity_vertical_margin"7 Android:paddingleft= "@dimen/activity_horizontal_margin"8 Android:paddingright= "@dimen/activity_horizontal_margin"9 Android:paddingtop= "@dimen/activity_vertical_margin"Ten Tools:context= "Com.hanqi.testapp2.PractiseActivity4" One android:orientation= "vertical"> A  -     <TextView -         Android:layout_width= "Match_parent" the Android:layout_height= "Wrap_content" - Android:id= "@+id/tvw1"/> -     <TextView -         Android:layout_width= "Match_parent" + Android:layout_height= "Wrap_content" - Android:id= "@+id/tvw2"/> +  A     <Button at         Android:layout_width= "Wrap_content" - Android:layout_height= "Wrap_content" - Android:id= "@+id/btt1" - Android:text= "Random Selection" - Android:onclick= "Btn_onclick"/> - </LinearLayout>

Java class:

1  Packagecom.hanqi.testapp2;2 3 ImportAndroid.os.Bundle;4 Importandroid.support.v7.app.AppCompatActivity;5 ImportAndroid.view.View;6 ImportAndroid.widget.Button;7 ImportAndroid.widget.TextView;8 ImportAndroid.widget.Toast;9 Ten  Public classPractiseActivity4extendsappcompatactivity { One  A TextView tvw1; - Button btt1; - TextView tvw2; the @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); - Setcontentview (R.LAYOUT.ACTIVITY_PRACTISE4); +TVW1 =(TextView) Findviewbyid (R.ID.TVW1); -BTT1 =(Button) Findviewbyid (R.ID.BTT1); +TVW2 =(TextView) Findviewbyid (R.ID.TVW2); A     } atString c1 = "Beijing"; -String C2 = "Shanghai"; -      Public voidBtn_onclick (View v) -     { -         //Creating a child thread 1 -        NewThread () { in @Override -             Public voidrun () { to                 for(inti=0;i<20;i++) +                { -                    if(i%2==0) the                    { *C1= ""; $                    }Panax Notoginseng                    Else -                    { thec1= "Beijing"; +                    } ARunonuithread (NewRunnable () { the @Override +                         Public voidrun () { - Tvw1.settext (C1); $                        } $                    }); -                    //Pause -                    Try { theThread.Sleep ((int) (Math.random () *1000)); -                    }Wuyi                   Catch(Exception e) the                   { -  Wu                   } -                } AboutRunonuithread (NewRunnable () { $ @Override -                     Public voidrun () { -Toast.maketext (PractiseActivity4. This, C1 + "loop complete", Toast.length_short). Show (); -                    } A                }); +            } the }.start (); -         //Creating a child thread 2 $         NewThread () { the @Override the              Public voidrun () { the                  for(inti=0;i<20;i++) the                 { -                     if(i%2==0) in                     { theC2= ""; the                     } About                     Else the                     { theC2= "Shanghai"; the                     } +Runonuithread (NewRunnable () { - @Override the                          Public voidrun () {Bayi Tvw2.settext (C2); the                         } the                     }); -                     //Pause -                     Try { theThread.Sleep ((int) (Math.random () *1000)); the                     } the                     Catch(Exception e) the                     { -  the                     } the                 } theRunonuithread (NewRunnable () {94 @Override the                      Public voidrun () { theToast.maketext (PractiseActivity4. This, C2 + "loop complete", Toast.length_short). Show (); the                     }98                 }); About             } - }.start ();101     }102 103}

Choose from two cities as a pre-selected destination. The implementation of two separate threads display 10 city names, each time after each display sleep a random time (within 1000ms), which first displayed, decided to go to which city. Implemented using the Runnable interface and the thread class, respectively.

android--Multithreaded Programming Exercises