如何获取所有手机存储（内部存储）目录列表

Question

I want to get all files list of internal storage. I've write this code,

File dir= getFilesDir();
        File[] list = dir.listFiles();
        for(File ff: list) {
            Toast.makeText(getApplicationContext(), ff.getName() , Toast.LENGTH_LONG).show();

        }

it just gives me Directory name: instant-run on Toast but my internal storage has many direcoties as you can see below picture,

kindly tell me how to get all these directories name.

Answer 1

I found a way to list all the directory in internal storage. please try this, it work's fine for me as i am using only internal storage in my phone.

MainActivity.java

package com.sumesh.filendirectory;

import android.app.ListActivity;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class FileNDirectoryActivity extends ListActivity {

    private List<String> fileList=new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        File root=new File(Environment.getExternalStorageDirectory().getAbsolutePath());
        ListDir(root);
    }

    void ListDir(File f){
        File[] files=f.listFiles();
        fileList.clear();
        for (File file: files){
            fileList.add(file.getPath());
        }

        ArrayAdapter<String> directoryList=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,fileList);
        setListAdapter(directoryList);
    }
}

Manifest.xml

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sumesh.filendirectory">

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".FileNDirectoryActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.xml file

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

hope it helps. if you are using android version 6 or above, once you install the app it will crash for sure because of storage run-time permission now how to resolve? add run-time permission code for storage and if you are lazy follow this one.

• goto ==> installed app ==> app info screen
• on permission list item give storage permission then it will run smoothly.

Other ways to do so:

MainActivity.java

    public class MainActivity extends AppCompatActivity {

    ListView lview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lview = (ListView) findViewById(R.id.lview1);
        String path=Environment.getExternalStorageDirectory().getAbsolutePath();
        File f = new File(path);//converted string object to file
        String[] values = f.list();//getting the list of files in string array
        //now presenting the data into screen
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_spinner_dropdown_item, values);
        lview.setAdapter(adapter);//setting the adapter

    }
}

ActivityMain.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lview1">
    </ListView>

</LinearLayout>

Manifest.xml

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sumesh.listview">

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 2

Your screenshot is of what the Android SDK calls external storage , not internal storage . The root of external storage is obtained via Environment.getExternalStorageDirectory() .

Answer 3

You can get dirs using below code...

File extStorageDir=new File(Environment.getExternalStorageDirectory());
    String fileList=extStorageDir.list();

    for(String fileName:fileList)
    sysout("FileName="+fileNAme);

Answer 4

尝试这个：

String dir = getFilesDir().getAbsolutePath();