個人喜歡複雜東西簡單化,這裏就不做理論性描述,實現這方法當然很多,比如可以使用廣播,實現Activity回調再調用Fragment等,這裏是直接Activity回調到Fragment
2.實現流程
2.1 單例回調委託代理類,MyInstance.java
package com.cyy.test; /** * Created by cyy on 2016/6/20. * 單例 代理接口回調 */ public class MyInstance { public static MyInstance instance; public CallBacker callBacker; //回調代理 public static MyInstance getInstance(){ if (instance==null){ instance=new MyInstance(); } return instance; } /** * 接口設置 */ public <T> void setCallBacker(CallBacker<T> callBacker) { this.callBacker = callBacker; } /** * 回調接口 */ public interface CallBacker<T> { void onCallBack(T var); } }
2.2 Activity1中設置單例委託類代理的回調方法
package com.cyy.test; import android.app.Fragment; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.Toast; public class MyFragment extends Fragment implements View.OnClickListener{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view=inflater.inflate(R.layout.fragment_my, container, false); Button button=(Button)view.findViewById(R.id.button); button.setOnClickListener(this); return view; } @Override public void onClick(View v) { switch (v.getId()){ case R.id.button: //設置回調代理方法 MyInstance.getInstance().setCallBacker(new MyInstance.CallBacker<String >() { @Override public void onCallBack(String var) { Toast.makeText(mContext,"回調成功"+var,Toast.LENGTH_SHORT).show(); } }); //點擊跳轉到到Activity2 startActivity(new Intent(getActivity(), Activity2.class)); break; } } }
2.3 Activity1中Fragment接口方法定義,打開Actvity2界面並設置回調方法
package com.cyy.test; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class Activity2 extends Activity implements View.OnClickListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity2); Button button=(Button)findViewById(R.id.button); button.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.button: //執行回調 MyInstance.getInstance().callBacker.onCallBack("來自Activity2回調"); finish(); break; } } }
3.Demo代碼這裏不提供了,這三個類直接複製使用就可以