Android开发之Fragment与Activity的数据交互透过回调机制实现（源代码分享）

Android开发之Fragment与Activity的数据交互通过回调机制实现（源代码分享）

  上一篇文章简单介绍了Android的回调机制的使用，这一篇博文将重点介绍Fragment碎片与activity的数据交互，fragment在Android开发中起着至关重要的作用，通过官方Android api我们可以看到，fragment有着自己的生命周期并依赖于它绑定的activity的生命周期而存在，那样activity与fragment怎样进行数据交互呢，请看此篇博文。

MainActiivity的代码

package com.example.f08_fragment03;import com.example.f08_fragment03.Fragment02.Callback;import android.os.Bundle;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {	private FragmentManager manager;// 创建fragment管理	private FragmentTransaction transaction;// 创建fragment的事物	private EditText editText;	private Button button;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		editText = (EditText) this.findViewById(R.id.editText2);		button = (Button) this.findViewById(R.id.button1);		manager = getFragmentManager();		transaction = manager.beginTransaction();		final Fragment02 fragment02 = new Fragment02();		transaction.add(R.id.left, fragment02, "left");		transaction.commit();		// 不管要实现怎样的功能都必须调用以下三个方法		// manager=getFragmentManager();		//transaction=manager.beginTransaction();		// transaction.commit();提交数据		button.setOnClickListener(new View.OnClickListener() {			@Override			public void onClick(View arg0) {				// TODO Auto-generated method stub				//通过callback机制得到fragment的数据				fragment02.getString(new Callback() {					@Override					public void getString(String msg) {						// TODO Auto-generated method stub						editText.setText(msg);					}				});			}		});	}	@Override	public boolean onCreateOptionsMenu(Menu menu) {		// Inflate the menu; this adds items to the action bar if it is present.		getMenuInflater().inflate(R.menu.main, menu);		return true;	}}

Fragment02的代码

package com.example.f08_fragment03;import android.app.Activity;import android.app.Fragment;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;public class Fragment02 extends Fragment {	private Button button;	private EditText editText;	@Override	public void onAttach(Activity activity) {		// TODO Auto-generated method stub		super.onAttach(activity);	}	@Override	public void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);	}	// 在该方法中更新UI	@Override	public View onCreateView(LayoutInflater inflater, ViewGroup container,			Bundle savedInstanceState) {		// TODO Auto-generated method stub		View view = inflater.inflate(R.layout.left, null);		button = (Button) view.findViewById(R.id.button1);		editText = (EditText) view.findViewById(R.id.editText1);		button.setOnClickListener(new View.OnClickListener() {			@Override			public void onClick(View arg0) {				//通过getActivity方法得到activity的控件，以此可以得到数据				EditText eText = (EditText) getActivity().findViewById(						R.id.editText2);				Log.i("info", "------->" + eText.getText().toString());				editText.setText(eText.getText().toString());			}		});		return view;	}	@Override	public void onStart() {		// TODO Auto-generated method stub		super.onStart();	}	@Override	public void onResume() {		// TODO Auto-generated method stub		super.onResume();	}	@Override	public void onPause() {		// TODO Auto-generated method stub		super.onPause();	}    //实现数据传递	public void getString(Callback callback) {		String msg = editText.getText().toString();		callback.getString(msg);	}    //创建接口	public interface Callback {		public void getString(String msg);	}}

main的xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <LinearLayout        android:id="@+id/left"        android:layout_width="200dp"        android:layout_height="match_parent"        android:background="#cbcbcb"        android:orientation="vertical" >    </LinearLayout>    <LinearLayout        android:id="@+id/right"         android:layout_width="200dp"        android:layout_height="match_parent"        android:orientation="vertical"         >                    </LinearLayout>    <EditText        android:id="@+id/editText2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_marginTop="14dp"        android:layout_toRightOf="@+id/left"        android:ems="10"        android:inputType="textPassword" >        <requestFocus />    </EditText>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/editText2"        android:layout_toRightOf="@+id/left"        android:text="得到Fragment的数据" /></RelativeLayout>

fragment的xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/editText1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="text"        android:ems="10" >        <requestFocus />    </EditText>    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="得到Activity的数据" /></LinearLayout>

      这样就大功告成了，点击fragment的button就可以在其editText控件显示activity的editText控件的文字，点击activity的button就可以得到fragment的编辑控件的数据！