Java 在內部類中訪問變量。需要宣布為最終

如果您不想使其最終確定，則始終可以將其設為全局變量。

因此標題說明了一切。我的內出現編譯錯誤onClick。

這是代碼。

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);}