获取手机所有安装APP的信息

public List<AppInfo> getAppInfo() {
// 获得PackageManager对象
mPm = this.getPackageManager();
List<PackageInfo> packageInfoList = mPm.getInstalledPackages(0);
// 根据name排序
Collections.sort(packageInfoList, new Comparator<PackageInfo>() {
@Override
public int compare(PackageInfo p1, PackageInfo p2) {
String name1 = (String) mPm.getApplicationLabel(p1.applicationInfo);
String name2 = (String) mPm.getApplicationLabel(p2.applicationInfo);
return name1.compareTo(name2);
}
});
mInfoList = new ArrayList<>();
for(PackageInfo info :packageInfoList){
AppInfo appInfo = new AppInfo();
//应用名称
String appName = (String) mPm.getApplicationLabel(info.applicationInfo);
//图标
Drawable icon = info.applicationInfo.loadIcon(mPm);
//包名
String packageName = info.applicationInfo.packageName;
//路径
String path = info.applicationInfo.sourceDir;
//大小
File file=new File(path);
String size = formatFileSize(file.length());
//版本
String versionName = info.versionName;
//第一次安装时间
long firstInstallTime = info.firstInstallTime;
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1 =new Date(firstInstallTime);
String firstTime=format.format(d1);
appInfo.setPkgName(packageName);
appInfo.setAppIcon(icon);
appInfo.setVersionName(versionName);
appInfo.setAppName(appName);
appInfo.setPkgPath(path);
appInfo.setCodeSize(size);
appInfo.setAppDate(firstTime);
mInfoList.add(appInfo);
}
return mInfoList;
}

/**
* 格式化
* @param length
* @return
*/
public static String formatFileSize(long length) {
String result = null;
int sub_string = 0;
// 如果文件长度大于1GB
if (length >= 1073741824) {
sub_string = String.valueOf((float) length / 1073741824).indexOf(
".");
result = ((float) length / 1073741824 + "000").substring(0,
sub_string + 3) + "GB";
} else if (length >= 1048576) {
// 如果文件长度大于1MB且小于1GB,substring(int beginIndex, int endIndex)
sub_string = String.valueOf((float) length / 1048576).indexOf(".");
result = ((float) length / 1048576 + "000").substring(0,
sub_string + 3) + "MB";
} else if (length >= 1024) {
// 如果文件长度大于1KB且小于1MB
sub_string = String.valueOf((float) length / 1024).indexOf(".");
result = ((float) length / 1024 + "000").substring(0,
sub_string + 3) + "KB";
} else if (length < 1024)
result = Long.toString(length) + "B";
return result;
}

/**
* 根据包名启动APP
* @param packagename 包名
*/
private void doStartApplicationWithPackageName(String packagename) {
// 创建一个类别为CATEGORY_LAUNCHER的该包名的Intent
Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resolveIntent.setPackage(packagename);
// 通过getPackageManager()的queryIntentActivities方法遍历
List<ResolveInfo> resolveinfoList = getPackageManager()
.queryIntentActivities(resolveIntent, 0);
if(resolveinfoList.size() == 0){
return;
}
ResolveInfo resolveinfo = resolveinfoList.iterator().next();
if (resolveinfo != null) {
String packageName = resolveinfo.activityInfo.packageName;
//App启动的Activity
String className = resolveinfo.activityInfo.name;
// LAUNCHER Intent
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
// 设置ComponentName参数1:packagename参数2:启动的Activity
ComponentName cn = new ComponentName(packageName, className);
intent.setComponent(cn);
startActivity(intent);
}
}