Java Android - Erstelle meine eigene Klasse

Question

Ich möchte meine eigene Klasse in Java erstellen, aber ich habe Probleme und Fehler. Ich sollte einfach in der Lage sein, eine einfache Klasse zu erstellen und sie in der öffentlichen Klasse der Hauptaktivität zu verwenden. Hier ist mein Code:

package com.example.android.scoreapp; 

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.TextView; 

class FootballTeam { 
    String name; 
    int score = 0; 

    public FootballTeam(String name) { 
     this.name = name; 
    } 

    public void touchDown(){ 
     this.score += 6; 
    } 

    public void fieldGoal(){ 
     this.score += 3; 
    } 

    public void twoPointConversion(){ 
     this.score += 2; 
    } 

    public void touchdownFieldGoal(){ 
     this.score += 1; 
    } 

    public void resetScore(){ 
     this.score = 0; 
    } 
} 

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

    /* --- Code --- */ 



    FootballTeam redSkins = new FootballTeam("Redskins"); 
    FootballTeam cowBoys = new FootballTeam("Cowboys"); 

    public void redSkins_touchDown(View view){ 
     redSkins.touchDown(); 
     render(); 
    } 

    public void redSkins_fieldGoal(View view){ 
     redSkins.fieldGoal(); 
     render(); 
    } 

    public void redSkins_twoPointConversion(View view){ 
     redSkins.twoPointConversion(); 
     render(); 
    } 

    public void redSkins_touchdownFieldGoal(View view){ 
     redSkins.touchdownFieldGoal(); 
     render(); 
    } 

    /* --- */ 

    public void cowBoys_touchDown(View view){ 
     cowBoys.touchDown(); 
     render(); 
    } 

    public void cowBoys_fieldGoal(View view){ 
     cowBoys.fieldGoal(); 
     render(); 
    } 

    public void cowBoys_twoPointConversion(View view){ 
     cowBoys.twoPointConversion(); 
     render(); 
    } 

    public void cowBoys_touchdownFieldGoal(View view){ 
     cowBoys.touchdownFieldGoal(); 
     render(); 
    } 

    /* --- */ 

    public void render() { 
     TextView redskinsScoreView = (TextView) findViewById(R.id.redskinsscoreview); 
     TextView cowboysScoreView = (TextView) findViewById(R.id.cowboysscoreview); 
     redskinsScoreView.setText(redSkins.score); 
     cowboysScoreView.setText(cowBoys.score); 
    } 

    public void resetScore(){ 
     redSkins.resetScore(); 
     cowBoys.resetScore(); 
     render(); 
    } 
} 

aber ich bekomme diese Fehlermeldung:

06-29 12:21:53.029 7188-7188/? E/Zygote: v2 
06-29 12:21:53.030 7188-7188/? I/libpersona: KNOX_SDCARD checking this for 10586 
06-29 12:21:53.030 7188-7188/? I/libpersona: KNOX_SDCARD not a persona 
06-29 12:21:53.030 7188-7188/? E/Zygote: accessInfo : 0 
06-29 12:21:53.034 7188-7188/? W/SELinux: SELinux selinux_android_compute_policy_index : Policy Index[2], Con:u:r:zygote:s0 RAM:SEPF_SECMOBILE_7.0_0005, [-1 -1 -4 -1 0 1] 
06-29 12:21:53.035 7188-7188/? I/SELinux: SELinux: seapp_context_lookup: seinfo=untrusted, level=s0:c512,c768, pkgname=com.example.android.scoreapp 
06-29 12:21:53.037 7188-7188/? I/art: Late-enabling -Xcheck:jni 
06-29 12:21:53.064 7188-7188/? D/TimaKeyStoreProvider: TimaKeyStore is not enabled: cannot add TimaSignature Service and generateKeyPair Service 
06-29 12:21:53.182 7188-7188/com.example.android.scoreapp W/System: ClassLoader referenced unknown path: /data/app/com.example.android.scoreapp-1/lib/arm64 
06-29 12:21:53.289 7188-7188/com.example.android.scoreapp W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
06-29 12:21:53.542 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: ThreadedRenderer.create() translucent=false 
06-29 12:21:53.547 7188-7188/com.example.android.scoreapp D/InputTransport: Input channel constructed: fd=58 
06-29 12:21:53.548 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: setView = DecorView@b840d76[MainActivity] touchMode=true 
06-29 12:21:53.566 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: dispatchAttachedToWindow 
06-29 12:21:53.618 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: Relayout returned: oldFrame=[0,0][0,0] newFrame=[0,0][1440,2560] result=0x7 surface={isValid=true 513479648768} surfaceGenerationChanged=true 
06-29 12:21:53.618 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: mHardwareRenderer.initialize() mSurface={isValid=true 513479648768} hwInitialized=true 
06-29 12:21:53.700 7188-7195/com.example.android.scoreapp W/art: Suspending all threads took: 6.561ms 
06-29 12:21:53.745 7188-7228/com.example.android.scoreapp D/libEGL: loaded /vendor/lib64/egl/libGLES_mali.so 
06-29 12:21:53.771 7188-7228/com.example.android.scoreapp I/OpenGLRenderer: Initialized EGL, version 1.4 
06-29 12:21:53.771 7188-7228/com.example.android.scoreapp D/OpenGLRenderer: Swap behavior 1 
06-29 12:21:53.780 7188-7228/com.example.android.scoreapp D/mali_winsys: EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) returns 0x3000, [1440x2560]-format:1 
06-29 12:21:54.010 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1 
06-29 12:21:54.010 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: MSG_WINDOW_FOCUS_CHANGED 1 
06-29 12:21:54.010 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: mHardwareRenderer.initializeIfNeeded()#2 mSurface={isValid=true 513479648768} 
06-29 12:21:54.011 7188-7188/com.example.android.scoreapp V/InputMethodManager: Starting input: tba=android.view.inputmethod.EditorInfo@dca97e4 nm : com.example.android.scoreapp ic=null 
06-29 12:21:54.011 7188-7188/com.example.android.scoreapp I/InputMethodManager: [IMM] startInputInner - mService.startInputOrWindowGainedFocus 
06-29 12:21:54.028 7188-7201/com.example.android.scoreapp D/InputTransport: Input channel constructed: fd=69 
06-29 12:21:54.039 7188-7188/com.example.android.scoreapp V/InputMethodManager: Starting input: tba=android.view.inputmethod.EditorInfo@7e2544d nm : com.example.android.scoreapp ic=null 
06-29 12:21:59.328 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: ViewPostImeInputStage processPointer 0 
06-29 12:21:59.331 7188-7188/com.example.android.scoreapp W/System: ClassLoader referenced unknown path: /system/framework/QPerformance.jar 
06-29 12:21:59.335 7188-7188/com.example.android.scoreapp E/BoostFramework: BoostFramework() : Exception_1 = java.lang.ClassNotFoundException: Didn't find class "com.qualcomm.qti.Performance" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib64, /vendor/lib64]] 
06-29 12:21:59.335 7188-7188/com.example.android.scoreapp V/BoostFramework: BoostFramework() : mPerf = null 
06-29 12:21:59.384 7188-7188/com.example.android.scoreapp D/ViewRootImpl@e324811[MainActivity]: ViewPostImeInputStage processPointer 1 
06-29 12:21:59.388 7188-7188/com.example.android.scoreapp W/ResourceType: No package identifier when getting value for resource number 0x00000006 
06-29 12:21:59.390 7188-7188/com.example.android.scoreapp D/AndroidRuntime: Shutting down VM 
06-29 12:21:59.395 7188-7188/com.example.android.scoreapp E/AndroidRuntime: FATAL EXCEPTION: main 
                      Process: com.example.android.scoreapp, PID: 7188 
                      java.lang.IllegalStateException: Could not execute method for android:onClick 
                       at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) 
                       at android.view.View.performClick(View.java:6205) 
                       at android.widget.TextView.performClick(TextView.java:11103) 
                       at android.view.View$PerformClick.run(View.java:23653) 
                       at android.os.Handler.handleCallback(Handler.java:751) 
                       at android.os.Handler.dispatchMessage(Handler.java:95) 
                       at android.os.Looper.loop(Looper.java:154) 
                       at android.app.ActivityThread.main(ActivityThread.java:6682) 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) 
                      Caused by: java.lang.reflect.InvocationTargetException 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
                       at android.view.View.performClick(View.java:6205)  
                       at android.widget.TextView.performClick(TextView.java:11103)  
                       at android.view.View$PerformClick.run(View.java:23653)  
                       at android.os.Handler.handleCallback(Handler.java:751)  
                       at android.os.Handler.dispatchMessage(Handler.java:95)  
                       at android.os.Looper.loop(Looper.java:154)  
                       at android.app.ActivityThread.main(ActivityThread.java:6682)  
                       at java.lang.reflect.Method.invoke(Native Method)  
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)  
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)  
                      Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x6 
                       at android.content.res.Resources.getText(Resources.java:1178) 
                       at android.widget.TextView.setText(TextView.java:5164) 
                       at com.example.android.scoreapp.MainActivity.render(MainActivity.java:99) 
                       at com.example.android.scoreapp.MainActivity.redSkins_touchDown(MainActivity.java:54) 
                       at java.lang.reflect.Method.invoke(Native Method)  
                       at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)  
                       at android.view.View.performClick(View.java:6205)  
                       at android.widget.TextView.performClick(TextView.java:11103)  
                       at android.view.View$PerformClick.run(View.java:23653)  
                       at android.os.Handler.handleCallback(Handler.java:751)  
                       at android.os.Handler.dispatchMessage(Handler.java:95)  
                       at android.os.Looper.loop(Looper.java:154)  
                       at android.app.ActivityThread.main(ActivityThread.java:6682)  
                       at java.lang.reflect.Method.invoke(Native Method)  
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)  
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)  

Answer 1

In Verfahren machen Footballteam Klasse auf diese Weise verwenden, können Sie Integer-Wert zu setText geben(). Daher denkt Framework, dass es eine Ressourcen-ID ist. Dann konnte es es nicht finden. Dies verursacht Ausnahme.

Diese Werte in String umwandeln.

public void render() { 
    ... 
    redskinsScoreView.setText(String.valueOf(redSkins.score)); 
    cowboysScoreView.setText(String.valueOf(cowBoys.score)); 
} 

Answer 2

Problem ist nicht mit dem Footballteam Klasse, sondern mit Ihrer onClick Methode. Es scheint, dass die Ansicht, an die Klick-Listener angehängt sind, eine falsche ID erhalten hat. Es ist klar, aus diesen Zeilen im Log: -

java.lang.IllegalStateException: Could not execute method for android:onClick 
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x6 

Der beste Weg, um den Fehler zu erhalten, ist von Aussagen im Protokoll verursacht suchen. Ich werde wahrscheinlich mehr sehen können, wenn ich deinen vollständigen Code sehen kann.

Answer 3

eine eigene Klasse erstellen Footballteam namens

public class FootballTeam { 

public static final int TOUCH_DOWN = 6; 
public static final int GOAL = 3; 

private String name; 
private int score; 

public FootballTeam(String name) { 
    this.name = name; 
} 

public int getScore(){ 
return score; 
} 

public void setScore(int newScore){ 
this.score = newScore; 
} 

public String getName() { 
    return name; 
} 

public void setName(String name) { 
    this.name = name; 
} 
} 

In Ihrem MainActivity Sie Sie

public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    FootballTeam redSkins = new FootballTeam("Redskins"); 
    FootballTeam cowBoys = new FootballTeam("Cowboys"); 

    // assign points 
    redSkins.setScore(redSkins.getScore() + FootballTeam.TOUCH_DOWN); 
    cowBoys.setScore(cowBoys.getScore() + FootballTeam.GOAL); 

    //reset points 
    redSkins.setScore(0); 
} 
}