android获取应用包名,按照首字母排序,支持字幕条索引完整实现代码
时间: 2024-02-02 20:02:26 浏览: 23
以下是获取应用包名,按照首字母排序并支持字母索引的完整实现代码:
```java
public class MainActivity extends AppCompatActivity {
private ListView mListView;
private List<AppInfo> mAppInfos;
private List<String> mSections;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = findViewById(R.id.list_view);
mAppInfos = new ArrayList<>();
mSections = new ArrayList<>();
// 获取应用包名
PackageManager pm = getPackageManager();
List<ApplicationInfo> apps = pm.getInstalledApplications(0);
for (ApplicationInfo app : apps) {
String packageName = app.packageName;
String appName = pm.getApplicationLabel(app).toString();
// 添加到列表中
mAppInfos.add(new AppInfo(appName, packageName));
}
// 按首字母排序
Collections.sort(mAppInfos, new Comparator<AppInfo>() {
@Override
public int compare(AppInfo o1, AppInfo o2) {
return o1.getName().compareTo(o2.getName());
}
});
// 添加字母索引
for (int i = 0; i < mAppInfos.size(); i++) {
String section = mAppInfos.get(i).getFirstLetter();
if (!mSections.contains(section)) {
mSections.add(section);
}
}
// 设置适配器
AppAdapter adapter = new AppAdapter();
mListView.setAdapter(adapter);
mListView.setDivider(null);
// 设置字母索引
final String[] sections = new String[mSections.size()];
mSections.toArray(sections);
ArrayAdapter<String> indexAdapter = new ArrayAdapter<>(this, R.layout.item_index, sections);
((IndexBar) findViewById(R.id.index_bar)).setIndexAdapter(indexAdapter);
((IndexBar) findViewById(R.id.index_bar)).setListView(mListView);
}
private class AppAdapter extends BaseAdapter implements SectionIndexer {
private LayoutInflater mInflater;
public AppAdapter() {
mInflater = LayoutInflater.from(MainActivity.this);
}
@Override
public int getCount() {
return mAppInfos.size();
}
@Override
public Object getItem(int position) {
return mAppInfos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_app, parent, false);
holder = new ViewHolder();
holder.iconView = convertView.findViewById(R.id.icon_view);
holder.nameView = convertView.findViewById(R.id.name_view);
holder.packageView = convertView.findViewById(R.id.package_view);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
AppInfo appInfo = mAppInfos.get(position);
holder.iconView.setImageDrawable(getAppIcon(appInfo.getPackageName()));
holder.nameView.setText(appInfo.getName());
holder.packageView.setText(appInfo.getPackageName());
return convertView;
}
@Override
public Object[] getSections() {
return mSections.toArray(new String[0]);
}
@Override
public int getPositionForSection(int sectionIndex) {
String section = mSections.get(sectionIndex);
for (int i = 0; i < getCount(); i++) {
String sortStr = mAppInfos.get(i).getFirstLetter();
if (sortStr.equals(section)) {
return i;
}
}
return -1;
}
@Override
public int getSectionForPosition(int position) {
return mSections.indexOf(mAppInfos.get(position).getFirstLetter());
}
}
private static class ViewHolder {
ImageView iconView;
TextView nameView;
TextView packageView;
}
private Drawable getAppIcon(String packageName) {
try {
PackageManager pm = getPackageManager();
ApplicationInfo ai = pm.getApplicationInfo(packageName, 0);
return pm.getApplicationIcon(ai);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
return null;
}
private static class AppInfo {
private String mName;
private String mPackageName;
public AppInfo(String name, String packageName) {
mName = name;
mPackageName = packageName;
}
public String getName() {
return mName;
}
public String getPackageName() {
return mPackageName;
}
public String getFirstLetter() {
return mName.substring(0, 1);
}
}
}
```
该代码实现了以下功能:
1. 获取设备上已安装应用程序的包名和名称,并将其添加到一个列表中。
2. 对应用程序列表按照名称首字母进行排序。
3. 添加字母索引,即在列表右侧添加一个字母条,点击字母条上的字母,可以快速滚动到该字母开头的应用程序。
4. 将应用程序列表显示在ListView中,并使用自定义适配器进行展示。
需要注意的是,该代码中使用了ViewHolder模式来优化ListView的性能。此外,我们还需要自定义一个AppInfo类来存储应用程序的名称、包名和首字母信息。