android 调用其他activity类中的方法

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在调用其他activity类中的方法是，出现错误；

错误方法：MainActivity activity=new MainActivity();

错误原因：activity是不能用new来实例化的。

解决办法：在activity类的onCreate()中调用该类的构造方法,把context和avtivity对象传过来。话不多说，代码更直观！

1.ClipBoardService.java

public class ClipBoardService {private Context contxt;private MainActivity activity;public Context getContxt() {return contxt;}public void setContxt(Context contxt) {this.contxt = (MainActivity) contxt;}public Activity getActivity() {return (MainActivity) activity;}public void setActivity(Activity activity) {this.activity = (MainActivity) activity;}public ClipBoardService(Context context, MainActivity activity) {this.setContxt(context);this.setActivity(activity);}private void getMethod(){activity.method();}}

2.MainActivity.java

public class MainActivity extends Activity{      private ClipBoardService clipBoard;          @Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);clipBoard = new ClipBoardService(this,MainActivity.this);   }public void method(){}}

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