Fragment的实现有两种方法：xml直接添加和通过代码添加。
下面xml中的<fragment和<RelativeLayout分别使用xml添加和代码添加：
XML代码：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
<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"
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=
".FragmentActivity"
>
<fragment
android:id=
"@+id/fragment1"
android:name=
"com.example.aexh32_fragment.MyFragment"
android:layout_width=
"wrap_content"
android:layout_height=
"wrap_content"
android:layout_alignLeft=
"@+id/textView1"
android:layout_below=
"@+id/textView1"
android:layout_marginTop=
"52dp"
/>
<RelativeLayout
android:id=
"@+id/relayout"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
android:layout_alignParentBottom=
"true"
>
</RelativeLayout>
</RelativeLayout>
|
MyFragment类：（通过xml添加，直接新建一个Fragment类，从ui面板选择Fragment添加）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
import
android.os.Bundle;
import
android.support.v4.app.Fragment;
import
android.view.LayoutInflater;
import
android.view.View;
import
android.view.ViewGroup;
import
android.webkit.WebView.FindListener;
import
android.widget.TextView;
public
class
MyFragment
extends
Fragment
{
//指定Fragment的layout，设置对应的控件事件
@Override
public
View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View layout = inflater.inflate(R.layout.frangment_layout,
null
);
TextView textView = (TextView) layout.findViewById(R.id.textView1);
return
layout;
}
}
|
FragmentActivity类：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
import
android.os.Bundle;
import
android.app.Activity;
import
android.support.v4.app.Fragment;
import
android.support.v4.app.FragmentTransaction;
import
android.view.Menu;
public
class
FragmentActivity
extends
android.support.v4.app.FragmentActivity
//导入的必须是support.v4才能支持2.3
{
/**
* 两种方法:
* 1.xml可视化添加：
* 先写好Fragment类，添加对应类的Fragment控件
* 2.通过代码添加Fragment
*/
@Override
protected
void
onCreate(Bundle savedInstanceState)
{
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment);
//通过代码添加
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
MyFragment newFragment =
new
MyFragment();
ft.add(R.id.relayout, newFragment);
//将MyFragment添加到relayout里
ft.commit();
//add、remove、replace后，都需要commit提交一下
}
}
|
其他：
1.将fragment放入栈中
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
void
addFragmentToStack()
{
mStackLevel++;
// Instantiate a new fragment.
Fragment newFragment = CountingFragment.newInstance(mStackLevel);
// Add the fragment to the activity, pushing this transaction
// on to the back stack.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.simple_fragment, newFragment);
//下面两句是关键
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(
null
);
ft.commit();
}
|
2.管理Fragment：
要在activity中管理fragment,需要使用FragmentManager. 通过调用activity的getFragmentManager()取得它的实例.
可以通过FragmentManager做一些事情, 包括:
1.使用findFragmentById()(用于在activity layout中提供一个UI的fragment)或findFragmentByTag()(适用于有或没有UI的fragment)获取activity中存在的fragment
2.将fragment从后台堆栈中弹出, 使用 popBackStack() (模拟用户按下BACK 命令).
3.使用addOnBackStackChangeListener()注册一个监听后台堆栈变化的listener.
参考资料:http://blog.csdn.net/aomandeshangxiao/article/details/7671533
3.fragment之间传递参数
传递参数的fragment：
|
1
2
3
4
5
6
7
8
9
10
|
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
InfoFragment fragment =
new
InfoFragment();
Bundle bundle =
new
Bundle();
bundle.putInt(Contant.KEY_BUNDLE_POSITION, position);
fragment.setArguments(bundle);
ft.replace(R.id.list_fraglayout, fragment);
ft.setCustomAnimations(R.anim.slide_right_enter, R.anim.slide_left_out, R.anim.slide_left_in, R.anim.slide_right_exit);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(
null
);
ft.commit();
|
接收参数的fragment:
|
1
|
int
mId = getArguments().getInt(Contant.KEY_BUNDLE_POSITION);
|
4.找到对应Fragment
|
1
2
3
4
5
6
7
8
|
FragmentManager fm = getSupportFragmentManager();
Fragment fragment = (LoadRateTypeFragment) fm.findFragmentByTag(HBContant.FRAGMENT_TAG_LOADRATETYPE);
if
(fragment ==
null
)
{
fragment =
new
LoadRateTypeFragment();
fragment.setTargetFragment(fragment,
0
);
fm.beginTransaction().add(fragment, HBContant.FRAGMENT_TAG_LOADRATETYPE).commit();
}
|
本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1229559，如需转载请自行联系原作者
