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);

}
}

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