Question

我四处张望，找不到我的代码出了什么问题，我只是想从自己的类中调用MainActivity方法：

MainActivity.java：

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    TestiClass testi = new TestiClass(this,this);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void testi_method(){

    }

}

TestiClass.java：

import android.app.Activity;
import android.content.Context;

public class TestiClass {

    private Activity mActivity;
    private Context mContext;

    TestiClass(Activity activity ,Context context){
        this.mActivity = activity;
        this.mContext = context;
    }

    void test(){
        mActivity.testi_method(); //????
    }

}

mActivity.testi_method()说-无法解析方法... 有什么想法吗？

Answer 1

如果这必须是您的实现，那么它很容易解决：

private final MainActivity mainActivity;
private final Context context;

TestiClass(MainActivity mainActivity, Context context){
    this.mainActivity = mainActivity;
    this.context = context;
}

Answer 2

不使用活动，使用您要调用该方法的类。解决方法是

   import android.app.Activity;
   import android.content.Context;

   public class TestiClass {

   private MainActivity  mActivity;
   private Context mContext;

   TestiClass(MainActivity activity ,Context context){
    this.mActivity = activity;
    this.mContext = context;
     }

     void test(){
      mActivity.testi_method(); 
      }
    }

无法从其类中调用MainActivity方法

2 个答案: