Android Environment 获取各种路径的方法

<pre name="code" class="java">package com.deepoon.beyond.environment;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Environment;
import android.widget.TextView;

import com.deepoon.beyond.R;

public class EnvironmentActivity extends Activity {
    private Context mContext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;
        setContentView(R.layout.activity_environment);
        TextView textViewDataDirectory = (TextView) findViewById(R.id.textview_data_directory);
        textViewDataDirectory.setText(Environment.getDataDirectory().getPath());

        TextView textViewRootDirectory = (TextView) findViewById(R.id.textview_root_directory);
        textViewRootDirectory.setText(Environment.getRootDirectory().getPath());

        TextView textViewExternalStorageState = (TextView) findViewById(R.id.textview_external_storage_state);
        textViewExternalStorageState.setText(Environment.getExternalStorageState().toString());

        TextView textViewDownloadCacheDirectory = (TextView) findViewById(R.id.textview_download_cache_directory);
        textViewDownloadCacheDirectory.setText(Environment.getDownloadCacheDirectory().getPath());

        TextView textViewExternalStorageDirectory = (TextView) findViewById(R.id.textview_external_storage_directory);
        textViewExternalStorageDirectory.setText(Environment.getExternalStorageDirectory().getPath());

        TextView textViewExternalStorageEmulated = (TextView) findViewById(R.id.textview_external_storage_emulated);
        textViewExternalStorageEmulated.setText("设备的外存是否是用内存模拟的: " + Environment.isExternalStorageEmulated());

        TextView textViewExternalStorageRemovable = (TextView) findViewById(R.id.textview_external_storage_removable);
        textViewExternalStorageRemovable.setText("设备的外存是否是可以拆卸的: " + Environment.isExternalStorageRemovable());

        TextView textViewDirectoryAlarms = (TextView) findViewById(R.id.textview_directory_alarms);
        textViewDirectoryAlarms.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_ALARMS).getPath());

        TextView textViewDirectoryDCIM = (TextView) findViewById(R.id.textview_directory_dcim);
        textViewDirectoryDCIM.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath());

        TextView textViewDirectoryDocuments = (TextView) findViewById(R.id.textview_directory_documents);
        textViewDirectoryDocuments.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS).getPath());

        TextView textViewDirectoryDownloads = (TextView) findViewById(R.id.textview_directory_downloads);
        textViewDirectoryDownloads.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath());

        TextView textViewDirectoryMovies = (TextView) findViewById(R.id.textview_directory_movies);
        textViewDirectoryMovies.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES).getPath());

        TextView textViewDirectoryMusic = (TextView) findViewById(R.id.textview_directory_music);
        textViewDirectoryMusic.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath());

        TextView textViewDirectoryNotifications = (TextView) findViewById(R.id.textview_directory_notifications);
        textViewDirectoryNotifications.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_NOTIFICATIONS).getPath());

        TextView textViewDirectoryPictures = (TextView) findViewById(R.id.textview_directory_pictures);
        textViewDirectoryPictures.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath());

        TextView textViewDirectoryPodcasts = (TextView) findViewById(R.id.textview_directory_podcasts);
        textViewDirectoryPodcasts.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PODCASTS).getPath());

        TextView textViewDirectoryRingtones = (TextView) findViewById(R.id.textview_directory_ringtones);
        textViewDirectoryRingtones.setText(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_RINGTONES).getPath());

        TextView textViewFilesDir = (TextView) findViewById(R.id.textview_files_dir);
        textViewFilesDir.setText(mContext.getFilesDir().getPath());

        TextView textViewCacheDir = (TextView) findViewById(R.id.textview_cache_dir);
        textViewCacheDir.setText(mContext.getCacheDir().getPath());

        TextView textViewExternalFilesDir = (TextView) findViewById(R.id.textview_external_files_dir);
        textViewExternalFilesDir.setText(mContext.getExternalFilesDir(Environment.DIRECTORY_MOVIES).getPath());

        TextView textViewExternalCacheDir = (TextView) findViewById(R.id.textview_external_cache_dir);
        textViewExternalCacheDir.setText(mContext.getExternalCacheDir().getPath());

    }
}

</pre><pre name="code" class="html"><?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"
    >

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="------------------Environment API-----------------------"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_root_directory"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.getRootDirectory()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_data_directory"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.getDataDirectory()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_storage_state"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.getExternalStorageState()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_download_cache_directory"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.getDownloadCacheDirectory()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_storage_directory"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.getExternalStorageDirectory()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_storage_emulated"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.isExternalStorageEmulated()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_storage_removable"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Environment.isExternalStorageRemovable()"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:text="注意：传入的类型参数不能是null，返回的目录路径有可能不存在，所以必须在使用之前确认一下，比如使用File.mkdirs创建该路径"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_alarms"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="系统提醒铃声: Environment.DIRECTORY_ALARMS"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_dcim"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="相机拍摄照片和视频: Environment.DIRECTORY_DCIM"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_documents"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="文档: Environment.DIRECTORY_DOCUMENTS"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_downloads"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="下载: Environment.DIRECTORY_DOWNLOADS"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_movies"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="电影: Environment.DIRECTORY_MOVIES"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_music"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="音乐: Environment.DIRECTORY_MUSIC"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_notifications"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="系统通知铃声: Environment.DIRECTORY_NOTIFICATIONS"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_pictures"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="图片: Environment.DIRECTORY_PICTURES"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_podcasts"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="系统广播: Environment.DIRECTORY_PODCASTS"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_directory_ringtones"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="系统铃声: Environment.DIRECTORY_RINGTONES"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="--------------------Context API------------------------"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_files_dir"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="应用的在系统内部Files: Context.getFilesDir()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_cache_dir"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="应用的在系统内部Cache: Context.getCacheDir()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_files_dir"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="应用的在SDCard Files: Context.getExternalFilesDir()"
                android:textSize="14sp"/>

            <TextView
                android:id="@+id/textview_external_cache_dir"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:textSize="14sp"/>

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="应用的在SDCard Files: Context.getExternalCacheDir()"
                android:textSize="14sp"/>
        </LinearLayout>
    </ScrollView>
</LinearLayout>