所以可以说我有这样的活动：
public class display_score extends Activity implements OnClickListener {
Button back;
TextView txt1;
TextView txt2;
TextView txt3;
TextView txt4;
TextView txt5;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.display_highscore);
back = (Button) findViewById(R.id.button1);
back.setOnClickListener(this);
txt1 = (TextView) findViewById(R.id.textView1);
txt2 = (TextView) findViewById(R.id.textView2);
txt3 = (TextView) findViewById(R.id.textView3);
txt4 = (TextView) findViewById(R.id.textView4);
txt5 = (TextView) findViewById(R.id.textView5);
txt1.setText("1. "+score.scores.getString("NAME","")+" "+String.valueOf(score.scores.getInt("SCORE",0)));
txt2.setText("2. "+score.scores.getString("NAME2","")+" "+String.valueOf(score.scores.getInt("SCORE2",0)));
txt3.setText("3. "+score.scores.getString("NAME3","")+" "+String.valueOf(score.scores.getInt("SCORE3",0)));
txt4.setText("4. "+score.scores.getString("NAME4","")+" "+String.valueOf(score.scores.getInt("SCORE4",0)));
txt5.setText("5. "+score.scores.getString("NAME5","")+" "+String.valueOf(score.scores.getInt("SCORE5",0)));
txt1.setTypeface(Typeface.createFromAsset(getAssets(),"game_over.ttf"));
txt2.setTypeface(Typeface.createFromAsset(getAssets(),"game_over.ttf"));
txt3.setTypeface(Typeface.createFromAsset(getAssets(),"game_over.ttf"));
txt4.setTypeface(Typeface.createFromAsset(getAssets(),"game_over.ttf"));
txt5.setTypeface(Typeface.createFromAsset(getAssets(),"game_over.ttf"));
txt1.setTextColor(Color.BLACK);
txt2.setTextColor(Color.BLACK);
txt3.setTextColor(Color.BLACK);
txt4.setTextColor(Color.BLACK);
txt5.setTextColor(Color.BLACK);
}
@Override
public void onClick(View v) {
finish();
}
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
}
和这样的布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:orientation="vertical"
android:background="@drawable/background">
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="1"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="2"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="3"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="4"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="5"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Back" />
</LinearLayout>
然后我得到这个异常：
04-24 22:02:43.101: E/AndroidRuntime(10956): FATAL EXCEPTION: main
04-24 22:02:43.101: E/AndroidRuntime(10956): java.lang.RuntimeException: Unable to start activity ComponentInfo{run.alexander.fuchs/run.alexander.fuchs.display_score}: java.lang.NullPointerException
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.os.Handler.dispatchMessage(Handler.java:99)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.os.Looper.loop(Looper.java:137)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-24 22:02:43.101: E/AndroidRuntime(10956): at java.lang.reflect.Method.invokeNative(Native Method)
04-24 22:02:43.101: E/AndroidRuntime(10956): at java.lang.reflect.Method.invoke(Method.java:511)
04-24 22:02:43.101: E/AndroidRuntime(10956): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
04-24 22:02:43.101: E/AndroidRuntime(10956): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
04-24 22:02:43.101: E/AndroidRuntime(10956): at dalvik.system.NativeStart.main(Native Method)
04-24 22:02:43.101: E/AndroidRuntime(10956): Caused by: java.lang.NullPointerException
04-24 22:02:43.101: E/AndroidRuntime(10956): at run.alexander.fuchs.display_score.onCreate(display_score.java:48)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.Activity.performCreate(Activity.java:4465)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-24 22:02:43.101: E/AndroidRuntime(10956): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-24 22:02:43.101: E/AndroidRuntime(10956): ... 11 more
这很奇怪，因为每个 laout 都在那里，字体在那里等等 :(
即使是共同的偏好也应该起作用！