java – 无法重用方法android OOP

在我的应用程序中,我无法重用我在ArabicUtility类中声明的方法.我的意图是使用阿拉伯语类来安排阿拉伯语文本.因此,我想要的是将字符串传递给我在Arabicutility类中声明的方法并进行转换.

我认为这基本上是我对OOP知识的一些问题.所以帮我纠正这个.

这是我添加到Arabicutility类的方法

public void addTranslate(int rid,TextView txt1) {
        String textv = getResources().getString(rid);
        txt1.setText(ArabicUtilities.reshapeSentence(textv));
    //  Typeface typeFace=Typeface.createFromAsset(getAssets(),"fonts/DroidNaskhBold.ttf");
    //  txt1.setTypeface(typeFace);

    }

我不能将此方法声明为静态,因为getResources()是非静态的.我必须从Activity扩展,因为我使用了android方法.原则上没有这样定义.

这就是我尝试在其他活动类中使用上述方法的方法.

arbic.addTranslate(R.string.butt18title1,txt1);
arbic.addTranslate(R.string.butt18desc1,txt2);

但是当我运行程序时,它会在我进行上述活动时崩溃.

这是日志猫

12-29 10:02:32.561: E/AndroidRuntime(951): FATAL EXCEPTION: main
12-29 10:02:32.561: E/AndroidRuntime(951): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxxx.xxx/com.xxxx.xxx.ShowMessageActivity}: java.lang.NullPointerException
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.os.Looper.loop(Looper.java:137)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread.main(ActivityThread.java:4745)
12-29 10:02:32.561: E/AndroidRuntime(951):  at java.lang.reflect.Method.invokeNative(Native Method)
12-29 10:02:32.561: E/AndroidRuntime(951):  at java.lang.reflect.Method.invoke(Method.java:511)
12-29 10:02:32.561: E/AndroidRuntime(951):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-29 10:02:32.561: E/AndroidRuntime(951):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-29 10:02:32.561: E/AndroidRuntime(951):  at dalvik.system.NativeStart.main(Native Method)
12-29 10:02:32.561: E/AndroidRuntime(951): Caused by: java.lang.NullPointerException
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.content.ContextWrapper.getResources(ContextWrapper.java:81)
12-29 10:02:32.561: E/AndroidRuntime(951):  at com.xxxx.xxx.ArabicUtilities.addTranslate(ArabicUtilities.java:252)
12-29 10:02:32.561: E/AndroidRuntime(951):  at com.xxxx.xxx.ShowMessageActivity.onCreate(ShowMessageActivity.java:184)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.Activity.performCreate(Activity.java:5008)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
12-29 10:02:32.561: E/AndroidRuntime(951):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
12-29 10:02:32.561: E/AndroidRuntime(951):  ... 11 more

public void addTranslate(int rid,TextView txt1,Context context) {
        String textv = context.getResources().getString(rid);
        txt1.setText(ArabicUtilities.reshapeSentence(textv));

    }

arbic.addTranslate(R.string.butt18title1,txt1,Your_Current_Activity.this);
arbic.addTranslate(R.string.butt18desc1,txt2,Your_Current_Activity.this);