Java 在内部类中访问变量。需要宣布为最终

如果您不想使其最终确定，则始终可以将其设为全局变量。

因此标题说明了一切。我的内出现编译错误onClick。

这是代码。

public class fieldsActivity extends Activity {Button addSiteButton;Button cancelButton;Button signInButton;/** * Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // to create a custom title bar for activity window requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); setContentView(R.layout.fields); // use custom layout title bar getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.topbar); Pager adapter = new Pager(); ViewPager mPager = (ViewPager) findViewById(R.id.fieldspager); mPager.setAdapter(adapter); mPager.setCurrentItem(1); addSiteButton = (Button) findViewById(R.id.addSiteButton); addSiteButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) { mPager.setCurrentItem(2,true); //Compilation error happens here.} }); cancelButton = (Button) findViewById(R.id.cancel_button); signInButton = (Button) findViewById(R.id.sign_in_button);}