我有两个片段。
第一个片段有Button
视图,点击后,应打开第二个片段。工具栏的标题应该在两个片段之间改变(从" First Fragment"到" Second Fragment")。第二个片段应该有一个"后退按钮"工具栏中的(箭头左侧图标),点击后,让用户返回第一个片段。
我该如何实现?
此外,是否可以设置两个片段之间的过渡动画,使其看起来好像第二个片段在新的"窗口中打开" (something like this)?
这是我的活动课程:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
if (findViewById(R.id.fragment_container) != null) {
if (savedInstanceState != null) {
return;
}
FirstFragment firstFragment = new FirstFragment();
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
}
}
以下是活动布局:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
<FrameLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
这是我的第一个片段类:
public class FirstFragment extends Fragment implements View.OnClickListener {
public FirstFragment() {
// Required empty public constructor
}
public static FirstFragment newInstance() {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
//
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
Button openSecondFragmentButton = (Button) view.findViewById(R.id.openSecondFragmentButton);
openSecondFragmentButton.setOnClickListener(this);
return view;
}
@Override
public void onClick(View v) {
Fragment fragment = null;
switch (v.getId()) {
case R.id.openSecondFragmentButton:
// ?
break;
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
}
@Override
public void onDetach() {
super.onDetach();
}
}
这是我的第一个片段布局:
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:isScrollContainer="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/openSecondFragmentButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Open Second Fragment" />
</RelativeLayout>
</RelativeLayout>
</ScrollView>
这是我的第二个片段类:
public class SecondFragment extends Fragment {
public SecondFragment() {
// Required empty public constructor
}
public static SecondFragment newInstance() {
SecondFragment fragment = new SecondFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
//
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_second, container, false);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
}
@Override
public void onDetach() {
super.onDetach();
}
}
最后,这是我的第二个片段布局:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<GridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="10" />
</LinearLayout>
如何实现我正在寻找的结果?
答案 0 :(得分:0)
在交易中使用addToBackStack
来获得“后退”行为。
在事务上使用setCustomAnimations
来设置片段转换动画。
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment)
.addToBackStack(null)
.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_out_right, R.anim.slide_in_left)
.commit();
以编程方式按“后退”按钮:
getSupportFragmentManager().popBackStack();
由于您显然正在使用支持库的FragmentTransaction
,因此动画应该是旧的R.anim
种动画。 (不支持FragmentTransaction
使用较新的R.animator
种类。)
/res/anim/slide_in_left.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromXDelta="-100%p"
android:toXDelta="0" />
</set>
/res/anim/slide_in_right.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromXDelta="100%p"
android:toXDelta="0" />
</set>
/res/anim/slide_out_left.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromXDelta="0"
android:toXDelta="-100%p" />
</set>
/res/anim/slide_out_right.xml:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="@android:integer/config_mediumAnimTime"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromXDelta="0"
android:toXDelta="100%p" />
</set>
将此代码添加到活动中的onCreate
:
mToolbar = (Toolbar) view.findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
然后覆盖onOptionsItemSelected()
:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
getSupportFragmentManager().popBackStack();
return true;
}
return false;
}