android 检测手机是否安装微信，微博，QQ

(亲测，适用)
工具类：

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

import java.util.List;
import java.util.Locale;

public class JudgeAppIsExistUtils {
    /**
     * 判断微信
     */
    public static boolean isWeixinAvilible(Context context) {
        final PackageManager packageManager = context.getPackageManager();// 获取packagemanager
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);// 获取所有已安装程序的包信息
        if (pinfo != null) {
            for (int i = 0; i < pinfo.size(); i++) {
                String pn = pinfo.get(i).packageName;
                if (pn.equals("com.tencent.mm")) {
                    return true;
                }
            }
        }
        return false;
    }
    /**
     * 判断qq是否可用
     */
    public static boolean isQQClientAvailable(Context context) {
        final PackageManager packageManager = context.getPackageManager();
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);
        if (pinfo != null) {
            for (int i = 0; i < pinfo.size(); i++) {
                String pn = pinfo.get(i).packageName;
                if (pn.equals("com.tencent.mobileqq")) {
                    return true;
                }
            }
        }
        return false;
    }
    /**
     * 判断微博
     */
    public static boolean isWeiboIAvilible(Context context) {
        PackageManager pm;
        if ((pm = context.getApplicationContext().getPackageManager()) == null) {
            return false;
        }
        List<PackageInfo> packages = pm.getInstalledPackages(0);
        for (PackageInfo info : packages) {
            String name = info.packageName.toLowerCase(Locale.ENGLISH);
            if ("com.sina.weibo".equals(name)) {
                return true;
            }
        }
        return false;
    }
}

引用：

if(JudgeAppIsExistUtils.isQQClientAvailable(LoginActivity.this))
{
     //已经安装QQ，加自己的逻辑
}else 
{
    Toast.makeText(LoginActivity.this,"检测到您未安装QQ",Toast.LENGTH_SHORT).show();
}

https://blog.csdn.net/qq_34783437/article/details/81302838