PackageInfo提供名称NotFoundException

Question

我正在寻找使用我的应用程序在我的设备上安装的不同应用程序的第一次安装时间。非常基本的PackageManager-

    package com.example.testingpackageinfo;
    
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.content.pm.PackageInfoCompat;
    
    import android.content.Context;
    import android.content.Intent;
    import android.content.pm.PackageInfo;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    
    public class MainActivity extends AppCompatActivity {
    
        Button button ;
        TextView textView;
        Context context;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            context = this;
    
    
            button = findViewById(R.id.button);
            textView = findViewById(R.id.textView);
    
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
    
                    try {
                        PackageManager pm = context.getPackageManager();
                        PackageInfo pInfo = pm.getPackageInfo("com.google.android.youtube", 0);
                        long installTime = pInfo.firstInstallTime;
                        textView.setText(String.valueOf(installTime));
                    } catch (PackageManager.NameNotFoundException e) {
                        e.printStackTrace();
                        textView.setText("Package Not found");
                    }
                }
            });
    
    
        }
    }

Answer 1

试试这个：

 private boolean checkInstalledApp(String packageName, PackageManager packageManager) {
        try {
            packageManager.getPackageInfo(packageName, 0);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
            return false;
        }
    }