获取Android系统应用信息

<?xml version="1.0" encoding="utf-8"?>
<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">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="应用程序列表"
        android:textSize="20dp"
        android:padding="5dp"
        android:background="@color/colorAccent"
        />

    <ListView
        android:id="@+id/list_ctn_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
     <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/app_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher"/>

        <TextView
            android:id="@+id/app_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:layout_toRightOf="@id/app_logo"
            android:layout_centerVertical="true"
            android:textSize="20dp"
            />
    </RelativeLayout>

public class AppInfo {
    private Drawable app_logo;
    private String name;
    private String packName;

    public AppInfo() {
    }

    public AppInfo(Drawable app_logo, String name, String packName) {
        this.app_logo = app_logo;
        this.name = name;
        this.packName = packName;
    }

    public Drawable getApp_logo() {
        return app_logo;
    }

    public void setApp_logo(Drawable app_logo) {
        this.app_logo = app_logo;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPackName() {
        return packName;
    }

    public void setPackName(String packName) {
        this.packName = packName;
    }
}

public class MainActivity extends AppCompatActivity {
    private ListView listView ;
    private List<AppInfo> data;
    private AppAdapter appAdapter;

    class AppAdapter extends BaseAdapter{
        @Override
        public int getCount() {
            return data.size();
        }

        @Override
        public Object getItem(int position) {
            return data.get(position);
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = View.inflate(MainActivity.this, R.layout.list_ctn, null);
            }
            AppInfo appInfo = data.get(position);
            ImageView imageView = (ImageView) convertView.findViewById(R.id.app_logo);
            TextView name = (TextView) convertView.findViewById(R.id.app_name);
            imageView.setImageDrawable(appInfo.getApp_logo());
            name.setText(appInfo.getName());
            return convertView;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = (ListView) findViewById(R.id.list_ctn_main);
        data = getAllAppInfos();
        AppAdapter appAdapter = new AppAdapter();
        listView.setAdapter(appAdapter);
    }

    private List<AppInfo> getAllAppInfos() {
        List<AppInfo> list = new ArrayList<AppInfo>();
        PackageManager packageManager = getPackageManager();
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(intent, 0);
        for (ResolveInfo ri : resolveInfos) {
            String packageName = ri.activityInfo.packageName;
            Drawable icon = ri.loadIcon(packageManager);
            String appName = ri.loadLabel(packageManager).toString();
            AppInfo appInfo = new AppInfo(icon, appName, packageName);
            list.add(appInfo);
        }
        return list;
    }
}

单击事件

长按删除更新列表

setAdapter和notify**都可以实现重新显示，前者会跳到list顶部，是因为重新渲染的ui，后者会使用所有缓存的item对象，前者不会