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MainActivity：
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package com.example.fragmentmanage;
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.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
private Button btn1;
private Button btn2;
private FirstFragment firstFragment;
private SencondFragment sencondFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
setDefaultFragment();
}
private void initView() {
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
}
private void setDefaultFragment() {
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
firstFragment = new FirstFragment();
transaction.replace(R.id.fragme_layout, firstFragment);
transaction.commit();
}
@Override
public void onClick(View arg0) {
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
switch (arg0.getId()) {
case R.id.btn1:
if (firstFragment == null) {
firstFragment = new FirstFragment();
}
transaction.replace(R.id.fragme_layout, firstFragment);
break;
case R.id.btn2:
if (sencondFragment == null) {
sencondFragment = new SencondFragment();
}
transaction.replace(R.id.fragme_layout, sencondFragment);
break;
default:
break;
}
transaction.commit();
}
}
activity_main：
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="btn1" /> android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="btn2" /> android:id="@+id/fragme_layout" android:layout_width="wrap_content" android:layout_height="wrap_content" />
FirstFragment：
package com.example.fragmentmanage;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FirstFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_first, null);
}
}
SencondFragment：
package com.example.fragmentmanage;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FirstFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_first, null);
}
}