Fragment的使用可以让我们的应用更灵活的适配各种型号的安卓设备，但是对于Fragment和Activity之间的通信，很多朋友应该比较陌生，下面我们就通过一个实例来看一看如何实现。
一、Activity->Fragment传递数据
1.main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:id="@+id/rl_fragment" android:orientation="vertical" android:layout_height="match_parent" > <EditText android:id="@+id/et_input" android:layout_width="match_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/btn_send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="发送" /></LinearLayout>
2.fragment.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" > <TextView android:id="@+id/tv_fragment" android:layout_height="wrap_content" android:layout_width="wrap_content" /></LinearLayout>
3.MainActivity.java:
package com.example.fragementcommunication;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity { private EditText mMainActivityET; private Button mSendButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); mMainActivityET = (EditText) findViewById(R.id.et_input); mSendButton = (Button) findViewById(R.id.btn_send); mSendButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String text = mMainActivityET.getText().toString(); MyFragment myFragment = new MyFragment(); Bundle bundle = new Bundle(); bundle.putString("input", text); myFragment.setArguments(bundle);// 传递string FragmentManager manager = getFragmentManager(); FragmentTransaction transaction = manager.beginTransaction(); transaction.add(R.id.rl_fragment, myFragment, "myfragment"); transaction.commit(); Toast.makeText(MainActivity.this, "向Fragment发送数据" + text, Toast.LENGTH_SHORT).show(); } }); }}4.MyFragment.java:
package com.example.fragementcommunication;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;public class MyFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragmet, null); TextView mFragmentTextView = (TextView) view.findViewById(R.id.tv_fragment); String string = getArguments().getString("input");// 获取数据； mFragmentTextView.setText(string); Toast.makeText(getActivity(), "成功获取数据" + string, Toast.LENGTH_SHORT).show(); return view; }}总结：发送数据方法->setArguments(bundle)
接收数据方法->getArguments()
下面我们看一下效果：
二、Fragment向Activity传值（接口回调的方式）
布局文件和上面一样，我们看一下java代码的改变：
1.MainActivity.java:
package com.example.fragementcommunication;import com.example.fragementcommunication.MyFragment.MyListener;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity implements MyListener{ private EditText mMainActivityET; private Button mSendButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); mMainActivityET = (EditText) findViewById(R.id.et_input); mSendButton = (Button) findViewById(R.id.btn_send); mSendButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String text = mMainActivityET.getText().toString(); MyFragment myFragment = new MyFragment(); Bundle bundle = new Bundle(); bundle.putString("input", text); myFragment.setArguments(bundle);// 传递string FragmentManager manager = getFragmentManager(); FragmentTransaction transaction = manager.beginTransaction(); transaction.add(R.id.rl_fragment, myFragment, "myfragment"); transaction.commit(); Toast.makeText(MainActivity.this, "向Fragment发送数据" + text, Toast.LENGTH_SHORT).show(); } }); } @Override public void callback(String back) { Toast.makeText(MainActivity.this, "获取到从Fragment中传来的数据" + back, Toast.LENGTH_SHORT).show(); }}2.MyFragment.java:
package com.example.fragementcommunication;import android.app.Activity;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;public class MyFragment extends Fragment { public MyListener listener; private String back="已经接收到数据！谢谢"; /** * 通过接口回调的方式从Fragment向activity传值； * @author Administrator * */ public interface MyListener{ public void callback(String back); } @Override public void onAttach(Activity activity) { super.onAttach(activity); listener=(MyListener) activity; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragmet, null); TextView mFragmentTextView = (TextView) view.findViewById(R.id.tv_fragment); String string = getArguments().getString("input");// 获取数据； mFragmentTextView.setText(string); Toast.makeText(getActivity(), "成功获取数据" + string, Toast.LENGTH_SHORT).show(); Toast.makeText(getActivity(), "向Activity传递数据" + back, Toast.LENGTH_SHORT).show(); listener.callback(back); return view; }}运行如下：
这时我们可以看到先是MainActivity向Fragment传递了123，然后Fragment向Activity传递了”已经接收到数据！谢谢“。
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