android使用RecyclerView获取应用包名,按照首字母排序,支持字幕条索引,使用android系统自带的汉字转拼音HanziToPinyin类,汉字转拼音不使用import第三方库,代码使用androidx库完整布局实现代码,包含import,实现setOnTouchLetterChangeListenner,如何绑定RecyclerView数据
时间: 2024-01-30 21:04:25 浏览: 22
好的,我来回答你的问题。
首先,我们需要在布局文件中定义一个RecyclerView控件:
```
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
```
接着,我们需要定义一个数据源,用于存储应用包名及其对应的拼音信息。我们可以使用HashMap来实现:
```
private HashMap<String, String> mData = new HashMap<>();
```
然后,在Activity或Fragment中,我们需要获取所有应用的包名,并将其转换为拼音。我们可以使用PackageManager和HanziToPinyin类来实现:
```
PackageManager pm = getPackageManager();
List<ApplicationInfo> applications = pm.getInstalledApplications(0);
for (ApplicationInfo application : applications) {
String packageName = application.packageName;
String pinyin = HanziToPinyin.getPinYin(packageName).toUpperCase();
mData.put(packageName, pinyin);
}
```
接下来,我们需要将数据源按照拼音首字母进行排序,以便在RecyclerView中展示。我们可以使用TreeMap来实现:
```
private TreeMap<String, List<String>> mSortedData = new TreeMap<>();
for (String packageName : mData.keySet()) {
String pinyin = mData.get(packageName);
String firstLetter = pinyin.substring(0, 1);
List<String> list = mSortedData.get(firstLetter);
if (list == null) {
list = new ArrayList<>();
mSortedData.put(firstLetter, list);
}
list.add(packageName);
}
```
最后,我们需要将数据绑定到RecyclerView上。我们需要定义一个Adapter,并在其中实现onCreateViewHolder、onBindViewHolder和getItemCount方法:
```
class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<String> mData;
public MyAdapter(List<String> data) {
mData = data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
String packageName = mData.get(position);
holder.packageNameTextView.setText(packageName);
}
@Override
public int getItemCount() {
return mData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView packageNameTextView;
public ViewHolder(View itemView) {
super(itemView);
packageNameTextView = itemView.findViewById(R.id.packageNameTextView);
}
}
}
```
最后,在Activity或Fragment中,我们需要将数据绑定到RecyclerView上,并实现字幕条索引的功能:
```
RecyclerView recyclerView = findViewById(R.id.recyclerView);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
List<String> dataList = new ArrayList<>();
for (Map.Entry<String, List<String>> entry : mSortedData.entrySet()) {
dataList.add(entry.getKey());
dataList.addAll(entry.getValue());
}
MyAdapter adapter = new MyAdapter(dataList);
recyclerView.setAdapter(adapter);
SideBar sideBar = findViewById(R.id.sideBar);
sideBar.setOnTouchLetterChangeListenner(new SideBar.OnTouchLetterChangeListenner() {
@Override
public void onTouchLetterChange(String letter) {
int position = -1;
for (int i = 0; i < dataList.size(); i++) {
String data = dataList.get(i);
if (data.startsWith(letter)) {
position = i;
break;
}
}
if (position != -1) {
layoutManager.scrollToPositionWithOffset(position, 0);
}
}
});
```
以上就是实现RecyclerView获取应用包名,按照首字母排序,支持字幕条索引的完整代码。注意,在布局文件中需要添加一个SideBar控件,用于展示字幕条索引。