如何创建一个包含 2 列的列表视图，显示所有已安装的 android 应用程序及其权限？

Question

我是 Android 开发的新手（2 天大）。

我打算创建一个应用程序，列出设备中所有当前安装的应用程序，并在每个结果旁边的列中显示授予的权限。我知道通常一个 listView 有 1 列，我如何制作另一列？

我也对其他想法持开放态度（比如当我单击已安装的应用程序名称时可能是另一个意图？）

以下是迄今为止我的代码，其中显示了所有已安装的应用程序：

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextSwitcher;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;


public class PopAnalysis extends Activity{
    ListView appList;
    private TextSwitcher mSwitcher;
    TextView myText;
    private ArrayList results = new ArrayList();
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.popupanalysis);
        appList = (ListView)findViewById(R.id.listViewApp);
        PackageManager pm = this.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN,null);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        ArrayList<ResolveInfo> list = (ArrayList<ResolveInfo>) pm.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED);
        for (ResolveInfo rInfo : list) {
            results.add(rInfo.activityInfo.applicationInfo.loadLabel(pm).toString());
            System.out.println(rInfo.activityInfo.applicationInfo.loadLabel(pm).toString());
        }
        appList.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, results));
        appList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                int itemposition = position;
                String value = (String) appList.getItemAtPosition(position);

            }
        });
    }
}

以下是我的 XML 代码：

<?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="match_parent">



     <ListView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/listViewApp"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginTop="56dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Large Text"
            android:id="@+id/textViewAnalysis"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />
        <TextView
            android:id="@+id/list_item_appname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textAppearance="@android:style/TextAppearance.Medium" />

        <TextView
            android:id="@+id/list_item_apppermissions"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" />
    </RelativeLayout>

Answer 1

首先，您需要为每个应用加载应用列表和权限。我在 Activity.onCreate 中这样做以简化示例。在 AsyncTask 中执行此操作的更好方法

public class MainActivity extends AppCompatActivity {

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

        final PackageManager packageManager = getPackageManager();

        final List<Pair<String, List<String>>> appsWithPermission = new ArrayList<>();

        final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        final List<ResolveInfo> apps = packageManager.queryIntentActivities(mainIntent, 0);
        for (ResolveInfo info : apps) {
            final ApplicationInfo applicationInfo = info.activityInfo.applicationInfo;
            final String appName = (String) applicationInfo.loadLabel(packageManager);

            final List<String> permissions = new ArrayList<>();

            if (appName != null) {

                try {
                    final PackageInfo packageInfo = packageManager.getPackageInfo(applicationInfo.packageName, PackageManager.GET_PERMISSIONS);
                    final String[] requestedPermissions = packageInfo.requestedPermissions;

                    if (requestedPermissions != null) {
                        permissions.addAll(Arrays.asList(requestedPermissions));
                    }

                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                }
            }

            appsWithPermission.add(new Pair<>(appName, permissions));
        }

        final ListView listView = (ListView) findViewById(R.id.list_view);
        final AppsAdapter appsAdapter = new AppsAdapter(this, appsWithPermission);
        listView.setAdapter(appsAdapter);
    }
}

其次你需要xml布局 list_item.xml

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

    <TextView
        android:id="@+id/list_item_appname"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        android:textAppearance="@android:style/TextAppearance.Medium" />

    <TextView
        android:id="@+id/list_item_apppermissions"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

</LinearLayout>

最后 AppsAdapter.java

public class AppsAdapter extends BaseAdapter {

    private final Context mContext;
    private List<Pair<String, List<String>>> mAppsWithPermission;

    public AppsAdapter(Context context, List<Pair<String, List<String>>> appsWithPermission) {
        mContext = context;
        mAppsWithPermission = appsWithPermission;
    }

    static class ViewHolder {
        public TextView appName;
        public TextView appPermissions;
    }

    @Override
    public int getCount() {
        return mAppsWithPermission.size();
    }

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

    @Override
    public long getItemId(int position) {
        return mAppsWithPermission.get(position).hashCode();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {

            convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.appName = (TextView) convertView.findViewById(R.id.list_item_appname);
            holder.appPermissions = (TextView) convertView.findViewById(R.id.list_item_apppermissions);

            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Pair<String, List<String>> item = mAppsWithPermission.get(position);

        holder.appName.setText(item.first);
        holder.appPermissions.setText(item.second.toString());

        return convertView;
    }
}