Android studio 35 獲取Android目錄路徑

package com.example.mybuttonfun;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;

import static android.os.Environment.getDataDirectory;
import static android.os.Environment.getDownloadCacheDirectory;

public class MainActivity extends AppCompatActivity {

    private String path;
    private String path1;
    private String path2;
    private File path3;
    File[] path4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button btn = findViewById(R.id.button);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 響應事件
                Toast.makeText(MainActivity.this,"測試按鈕",Toast.LENGTH_SHORT).show();
                path = Environment.getExternalStorageDirectory().getAbsolutePath();
                Toast.makeText(MainActivity.this,path,Toast.LENGTH_SHORT).show();
                //獲取該程序的安裝包路徑
                path1=getApplicationContext().getPackageResourcePath();
                Toast.makeText(MainActivity.this,path1,Toast.LENGTH_SHORT).show();
                //這個方法是獲取某個應用在外部存儲中的cache路徑
                path2=getExternalCacheDir().getAbsolutePath();
                Toast.makeText(MainActivity.this,path2,Toast.LENGTH_SHORT).show();

                path2=getExternalFilesDir("").getAbsolutePath();
                Toast.makeText(MainActivity.this,path2,Toast.LENGTH_SHORT).show();

                path2=getExternalCacheDir().getAbsolutePath();
                Toast.makeText(MainActivity.this,path2,Toast.LENGTH_SHORT).show();



            }
        });

    }
}