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。
<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>
<?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>
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(); } }); } }
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; } }
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(); } }
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; } }