Android：通过 Int 与 Intent 崩溃应用程序 [关闭]

Question

您好，希望有人可以帮助我解决我在运行代码时遇到的错误。想要的是当用户从主类获得游戏结束分数时被带到游戏结束类以显示最终分数。没有意图，游戏结束屏幕加载正常，但是当我在游戏结束时添加意图运行游戏时，应用程序崩溃这是我的代码，其中分数是 int：

主类意图：

Intent myIntent = new Intent(MainActivity.this,gameover.class);
            myIntent.putExtra("number", score);
                        MainActivity.this.startActivity(myIntent); 

游戏结束类：

EndScore = (TextView) findViewById(R.id.show);

            int numScore;
            numScore = getIntent().getExtras().getInt("number");
            String s = String.valueOf( numScore );
            EndScore.setText(s);

我一直在浏览论坛，但看不出我做错了什么。 日志如下：

12-28 02:36:37.760: I/Adreno200-EGLSUB(17096): <ConfigWindowMatch:2081>: Format RGBA_8888.
12-28 02:36:37.770: D/memalloc(17096): /dev/pmem: Mapped buffer base:0x5189a000 size:4866048 offset:4251648 fd:68
12-28 02:36:37.860: D/memalloc(17096): /dev/pmem: Mapped buffer base:0x51e6e000 size:2949120 offset:2334720 fd:71
12-28 02:36:38.870: W/dalvikvm(17096): threadid=1: thread exiting with uncaught exception (group=0x40b0a9f0)
12-28 02:36:38.880: E/AndroidRuntime(17096): FATAL EXCEPTION: main
12-28 02:36:38.880: E/AndroidRuntime(17096): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.phil3992.colourguess/com.phil3992.colourguess.gameover}: java.lang.NullPointerException
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.os.Looper.loop(Looper.java:137)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread.main(ActivityThread.java:4424)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at java.lang.reflect.Method.invokeNative(Native Method)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at java.lang.reflect.Method.invoke(Method.java:511)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at dalvik.system.NativeStart.main(Native Method)
12-28 02:36:38.880: E/AndroidRuntime(17096): Caused by: java.lang.NullPointerException
12-28 02:36:38.880: E/AndroidRuntime(17096):    at com.phil3992.colourguess.gameover.onCreate(gameover.java:22)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.Activity.performCreate(Activity.java:4470)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-28 02:36:38.880: E/AndroidRuntime(17096):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
12-28 02:36:38.880: E/AndroidRuntime(17096):    ... 11 more

当用户得分时 int 是递增的，然后在游戏结束时它应该发送并显示在 textview 中

更新整个游戏结束类：

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class gameover extends Activity {
    Button re_run;
    TextView EndScore;
      @Override
         public void onCreate(Bundle savedInstanceState) {         
          re_run = (Button) findViewById(R.id.retry);
            super.onCreate(savedInstanceState);    
            setContentView(R.layout.gameover);
           EndScore = (TextView) findViewById(R.id.show);

        int numScore;
        numScore = getIntent().getExtras().getInt("number");
        String s = String.valueOf( numScore );
        EndScore.setText(s);

      }
      @SuppressWarnings("unused")
    private void setButtonOnClickListeners(){

            re_run.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v) {

                }
            });
    }

      @Override
      public void onBackPressed() {
          // Do nothing
      }
    }

Answer 1

放这条线-

   re_run = (Button) findViewById(R.id.retry);

下面

setContentView().

Answer 2

似乎在R.layout.gameover 布局中找不到TextView EndScore（如果您将来可以为变量使用小写字母）。

确保 TextView 实际上位于该 XML 文件中。 确保它是 TextView 而不是其他东西，例如 EditText 或类似的东西（尽管我认为这会引发不同的错误）。

EndScore 根据 LogCat 为 null。