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需求：安卓开发 获取手机中最常用的app信息。获取的结果为0（小米手机和AS自带的模拟器）
版本：安卓11
下面是我的代码

public class TextActivity extends AppCompatActivity {

    private final String[] PERMISSIONS_CONTACTS = new String[]{
            android.Manifest.permission.INTERNET,
            android.Manifest.permission.GET_PACKAGE_SIZE,
            android.Manifest.permission.QUERY_ALL_PACKAGES,
            android.Manifest.permission.PACKAGE_USAGE_STATS
    };

    private final int app_code = 1;

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

  // 判断是否开启权限
        PermissionUtil.checkPermission(this, PERMISSIONS_CONTACTS, app_code);

        TextView textView = findViewById(R.id.tv_size);

        List<AppUsageInfo> appUsageInfoList = getTopUsedApps(this, 5); // 获取前5个最常用的应用程序信息
        textView.setText("数量："+appUsageInfoList.size()+"==");
        for (AppUsageInfo appUsageInfo : appUsageInfoList) {
            Log.d("AppInfo", appUsageInfo.getAppName() + ": " + appUsageInfo.getTotalTimeInForeground() + "毫秒");
        }
    }

    public static List<AppUsageInfo> getTopUsedApps(Context context, int limit) {
        UsageStatsManager usageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
        PackageManager packageManager = context.getPackageManager();

        Calendar calendar = Calendar.getInstance();
        long endTime = calendar.getTimeInMillis();
        calendar.add(Calendar.DAY_OF_YEAR, -1); // 查询一天内的应用使用情况
        long startTime = calendar.getTimeInMillis();

        UsageEvents usageEvents = usageStatsManager.queryEventsForSelf(startTime, endTime);

        List<UsageStats> usageStatsList = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, startTime, endTime);
        Map<String, UsageStats> usageStatsMap = usageStatsManager.queryAndAggregateUsageStats(startTime, endTime);

        List<AppUsageInfo> appUsageInfoList = new ArrayList<>();

        for (UsageStats usageStats : usageStatsList) {
            try {
                String packageName = usageStats.getPackageName();
                Intent intent = packageManager.getLaunchIntentForPackage(packageName);
                if (intent != null) {
                    String appName = packageManager.getApplicationLabel(packageManager.getApplicationInfo(packageName, 0)).toString();
                    long totalTimeInForeground = usageStatsMap.get(packageName).getTotalTimeInForeground();
                    appUsageInfoList.add(new AppUsageInfo(appName, packageName, totalTimeInForeground));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        Collections.sort(appUsageInfoList, new Comparator<AppUsageInfo>() {
            @Override
            public int compare(AppUsageInfo app1, AppUsageInfo app2) {
                return Long.compare(app2.getTotalTimeInForeground(), app1.getTotalTimeInForeground());
            }
        });

        return appUsageInfoList.subList(0, Math.min(limit, appUsageInfoList.size()));
    }
}

class AppUsageInfo {
    private String appName;
    private String packageName;
    private long totalTimeInForeground;

    public AppUsageInfo(String appName, String packageName, long totalTimeInForeground) {
        this.appName = appName;
        this.packageName = packageName;
        this.totalTimeInForeground = totalTimeInForeground;
    }

    public String getAppName() {
        return appName;
    }

    public String getPackageName() {
        return packageName;
    }

    public long getTotalTimeInForeground() {
        return totalTimeInForeground;
    }
}

运行结果：

Answer 1

我试了一下，应该是没有问题，请再检查一下权限是否获取，某些权限可能需要打开设置进行手动设置，获取了权限后重新进入页面

https://blog.csdn.net/qq_41009768/article/details/104360533