Fragment1.java
public class Fragment1 extends Fragment implements View.OnClickListener{
Button BTN;
Communicator comm;
int count=0;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view=inflater.inflate(R.layout.fragment1, container,false);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
BTN=(Button) getActivity().findViewById(R.id.button_id);
comm=(Communicator)getActivity();
BTN.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count++;
comm.respond("clicked "+count+" times");
}
}
Fragment2.java
public class Fragment2 extends Fragment{
TextView ET;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view=inflater.inflate(R.layout.fragment2, container,false);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
ET=(TextView) getActivity().findViewById(R.id.textView_id);
}
public void ChangeText(String data)
{
ET.setText(data);
}
}
MainActivity.java
public class MainActivity extends FragmentActivity implements Communicator{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void respond(String data) {
// TODO Auto-generated method stub
FragmentManager manager=getSupportFragmentManager();
Fragment2 f2=(Fragment2) manager.findFragmentById(R.id.fragment2);
f2.ChangeText(data);
}
}
Communicator.java
public interface Communicator {
public void respond(String data);
}
日志::
12-28 12:02:05.096: E/AndroidRuntime(394): FATAL EXCEPTION: main
12-28 12:02:05.096: E/AndroidRuntime(394): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmenttofragmentcommunication/com.example.fragmenttofragmentcommunication.MainActivity}: android.view.InflateException: Binary XML file line #11: Error inflating class fragment
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.os.Handler.dispatchMessage(Handler.java:99)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.os.Looper.loop(Looper.java:123)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-28 12:02:05.096: E/AndroidRuntime(394): at java.lang.reflect.Method.invokeNative(Native Method)
12-28 12:02:05.096: E/AndroidRuntime(394): at java.lang.reflect.Method.invoke(Method.java:521)
12-28 12:02:05.096: E/AndroidRuntime(394): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-28 12:02:05.096: E/AndroidRuntime(394): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-28 12:02:05.096: E/AndroidRuntime(394): at dalvik.system.NativeStart.main(Native Method)
12-28 12:02:05.096: E/AndroidRuntime(394): Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class fragment
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:582)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
12-28 12:02:05.096: E/AndroidRuntime(394): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.Activity.setContentView(Activity.java:1647)
12-28 12:02:05.096: E/AndroidRuntime(394): at com.example.fragmenttofragmentcommunication.MainActivity.onCreate(MainActivity.java:14)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-28 12:02:05.096: E/AndroidRuntime(394): ... 11 more
12-28 12:02:05.096: E/AndroidRuntime(394): Caused by: java.lang.IllegalStateException: Fragment com.example.fragmenttofragmentcommunication.Fragment1 did not create a view.
12-28 12:02:05.096: E/AndroidRuntime(394): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:314)
12-28 12:02:05.096: E/AndroidRuntime(394): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:558)
12-28 12:02:05.096: E/AndroidRuntime(394): ... 20 more
注意 ::我使用较低版本的android，所以我在所有地方使用了支持片段
答案 0 :(得分：1)
在片段1中
View view=inflater.inflate(R.layout.fragment1, container,false);
return view;
然后
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
BTN=(Button) getView().findViewById(R.id.button_id);
// if button is in fragment layout should us getView() instead of activity
comm=(Communicator)getActivity();
BTN.setOnClickListener(this);
}