对于某些应用程序，getLaunchIntentForPackage 为 null

Question

我正在构建一项服务，可将已安装应用列表从 Android TV 或 Fire TV 发送到手机。然后手机发回它想要启动的应用程序的包名，服务启动它。

这是创建列表的代码

public List<InstalledApp> GetInstalledApps(boolean isAndroid) {
    PackageManager pm = getPackageManager();
    List<ApplicationInfo> allPackages = pm.getInstalledApplications(PackageManager.GET_META_DATA);
    List<InstalledApp> userPackages = new ArrayList<InstalledApp>();

    for (ApplicationInfo packageInfo : allPackages) {

        if (isSystemPackage(packageInfo)) continue;

        InstalledApp app = new InstalledApp();
        app.setPackageName(packageInfo.packageName);
        app.setAppName(pm.getApplicationLabel(packageInfo).toString());
        if (!isAndroid) {
            app.setIcon(pm.getApplicationIcon(packageInfo));
        }
        app.setAccentColor(getAccentColor(pm.getApplicationIcon(packageInfo)));

        userPackages.add(app);
    }

    return userPackages;
}

这就是我启动应用程序的方式

public void launchApp(String packageName) {
    PackageManager pm = getPackageManager();
    Intent intent = pm.getLaunchIntentForPackage(packageName);
    startActivity(intent);
}

在 Fire TV 上一切正常，但在 Android TV 上，许多应用程序的意图始终为空。这些才一点点。

• com.haystack.android
• com.netflix.ninja
• 电视.pluto.android
• com.bamnetworks.mlbtv

然而，使用相同的代码，这些应用程序工作得很好。

• com.hulu.livingroomplus
• com.sling
• com.frogmind.badland
• com.songza.tv

谁能就我可能做错了什么提供任何见解？

谢谢！

编辑： 我也试过这个但我得到了例外

android.content.ActivityNotFoundException：找不到处理 Intent { cat=[android.intent.category.LEANBAACK_LAUNCHER] flg=0x10000000 pkg=com.netflix.ninja } 的活动

public void launchApp(String packageName) {
    Intent intent = new Intent();
    intent.setPackage(packageName);
    intent.addCategory("android.intent.category.LEANBACK_LAUNCHER");
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}

编辑 2：

这是对我有用的代码：

 public void launchApp(String packageName) {
    Intent intent = new Intent();
    intent.setPackage(packageName);

    PackageManager pm = getPackageManager();
    List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, 0);
    Collections.sort(resolveInfos, new ResolveInfo.DisplayNameComparator(pm));

    if(resolveInfos.size() > 0) {
        ResolveInfo launchable = resolveInfos.get(0);
        ActivityInfo activity = launchable.activityInfo;
        ComponentName name=new ComponentName(activity.applicationInfo.packageName,
                activity.name);
        Intent i=new Intent(Intent.ACTION_MAIN);

        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        i.setComponent(name);

        startActivity(i);
    }
}

原文由 Jeremy Roberts 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

要创建一个主屏幕风格的启动器，不要寻找应用程序，然后尝试为每个应用程序启动 Intents 。在 PackageManager queryIntentActivities() 寻找可启动的活动。

例如，此活动（来自 此示例项目）使用此技术实现了一个主屏幕样式的启动器：

 /***
  Copyright (c) 2008-2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
*/

package com.commonsware.android.launchalot;

import android.app.ListActivity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;

public class Launchalot extends ListActivity {
  AppAdapter adapter=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    PackageManager pm=getPackageManager();
    Intent main=new Intent(Intent.ACTION_MAIN, null);

    main.addCategory(Intent.CATEGORY_LAUNCHER);

    List<ResolveInfo> launchables=pm.queryIntentActivities(main, 0);

    Collections.sort(launchables,
                     new ResolveInfo.DisplayNameComparator(pm));

    adapter=new AppAdapter(pm, launchables);
    setListAdapter(adapter);
  }

  @Override
  protected void onListItemClick(ListView l, View v,
                                 int position, long id) {
    ResolveInfo launchable=adapter.getItem(position);
    ActivityInfo activity=launchable.activityInfo;
    ComponentName name=new ComponentName(activity.applicationInfo.packageName,
                                         activity.name);
    Intent i=new Intent(Intent.ACTION_MAIN);

    i.addCategory(Intent.CATEGORY_LAUNCHER);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
    i.setComponent(name);

    startActivity(i);
  }

  class AppAdapter extends ArrayAdapter<ResolveInfo> {
    private PackageManager pm=null;

    AppAdapter(PackageManager pm, List<ResolveInfo> apps) {
      super(Launchalot.this, R.layout.row, apps);
      this.pm=pm;
    }

    @Override
    public View getView(int position, View convertView,
                          ViewGroup parent) {
      if (convertView==null) {
        convertView=newView(parent);
      }

      bindView(position, convertView);

      return(convertView);
    }

    private View newView(ViewGroup parent) {
      return(getLayoutInflater().inflate(R.layout.row, parent, false));
    }

    private void bindView(int position, View row) {
      TextView label=(TextView)row.findViewById(R.id.label);

      label.setText(getItem(position).loadLabel(pm));

      ImageView icon=(ImageView)row.findViewById(R.id.icon);

      icon.setImageDrawable(getItem(position).loadIcon(pm));
    }
  }
}

在 Android TV 设备上，您还应该搜索 LEANBACK_LAUNCHER 活动，因为这是 Android TV 使用的内容，并且特定于电视的 APK 可能没有常规的 LAUNCHER 活动，或者最多有不一定适合在电视上使用的。

原文由 CommonsWare 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

自 Android 11 以来，某些应用程序将不会提供此信息，除非您将 queries 标记添加到 AndroidManifest，例如

    <queries>
        <package android:name="app.i.want.to.query" />
    </queries>

请参阅 此处 了解更多信息

原文由 Billda 发布，翻译遵循 CC BY-SA 4.0 许可协议