测试代码1：

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

    android.util.Log.e("wenqiao", "Environment.getDataDirectory():" + android.os.Environment.getDataDirectory().getAbsolutePath() + "\n");
    android.util.Log.e("wenqiao", "Environment.getExternalStorageDirectory():" + android.os.Environment.getExternalStorageDirectory().getAbsolutePath() + "\n");
    android.util.Log.e("wenqiao", "Environment.getRootDirectory():" + android.os.Environment.getRootDirectory().getAbsolutePath() + "\n");
    android.util.Log.e("wenqiao", "Environment.getDownloadCacheDirectory():" + android.os.Environment.getDownloadCacheDirectory().getAbsolutePath());
    /**
     * 这个方法接收一个参数，表明目录所放的文件的类型，传入的参数是Environment类中的DIRECTORY_XXX静态变量，比如DIRECTORY_DCIM等.
     * 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。
     */
    java.io.File path = android.os.Environment.getExternalStoragePublicDirectory(android.os.Environment.DIRECTORY_ALARMS);
    if( !path.exists() ){
        path.mkdirs();
    }
    /* /storage/emulated/0/Alarms */
    android.util.Log.e("wenqiao", "Environment.getExternalStoragePublicDirectory():" + android.os.Environment.getExternalStoragePublicDirectory(android.os.Environment.DIRECTORY_ALARMS));

    /**
     * contextWrapper
     */
    android.util.Log.e("wenqiao", "getCacheDir():" + this.getCacheDir().getAbsolutePath());
    android.util.Log.e("wenqiao", "getFilesDir():" + this.getFilesDir().getAbsolutePath());
    android.util.Log.e("wenqiao", "getExternalCacheDir():" + this.getExternalCacheDir().getAbsolutePath());
    android.util.Log.e("wenqiao", "getExternalFilesDir():" + this.getExternalFilesDir(android.os.Environment.DIRECTORY_DCIM).getAbsolutePath());
    android.util.Log.e("wenqiao", "getPackageResourcePath():" + this.getPackageResourcePath());
    android.util.Log.e("wenqiao", "getDir():" + this.getDir("myfile", android.content.Context.MODE_PRIVATE));
    }

输出结果（myapplication为包名）：

Environment.getDataDirectory():/data
Environment.getExternalStorageDirectory():/storage/emulated/0
Environment.getRootDirectory():/system
Environment.getDownloadCacheDirectory():/data/cache
Environment.getExternalStoragePublicDirectory():/storage/emulated/0/Alarms
getCacheDir():/data/user/0/com.example.mushr.myapplication/cache
getFilesDir():/data/user/0/com.example.mushr.myapplication/files
getExternalCacheDir():/storage/emulated/0/Android/data/com.example.mushr.myapplication/cache
getExternalFilesDir():/storage/emulated/0/Android/data/com.example.mushr.myapplication/files/DCIM
getPackageResourcePath():/data/app/com.example.mushr.myapplication-1/base.apkgetDir():/data/user/0/com.example.mushr.myapplication/app_myfile

 

 

测试代码2：

public static void getEnvironmentDirectories() {
        android.util.Log.e(LOG_TAG, "getRootDirectory(): "
                + android.os.Environment.getRootDirectory().toString());
        android.util.Log.e(LOG_TAG, "getDataDirectory(): "
                + android.os.Environment.getDataDirectory().toString());
        android.util.Log.e(LOG_TAG, "getDownloadCacheDirectory(): "
                + android.os.Environment.getDownloadCacheDirectory().toString());
        android.util.Log.e(LOG_TAG, "getExternalStorageDirectory(): "
                + android.os.Environment.getExternalStorageDirectory().toString());

        android.util.Log.e(
                LOG_TAG,
                "getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES): "
                        + android.os.Environment.getExternalStoragePublicDirectory(
                                android.os.Environment.DIRECTORY_PICTURES).toString());

//        Log.i(
//                LOG_TAG,
//                "isExternalStorageEmulated(): "
//                        + Environment.isExternalStorageEmulated());
//
//        Log.i(
//                LOG_TAG,
//                "isExternalStorageRemovable(): "
//                        + Environment.isExternalStorageRemovable());

    }

    public static void getApplicationDirectories(android.content.Context context) {

        android.util.Log.e(LOG_TAG, "context.getFilesDir(): "
                + context.getFilesDir().toString());
        android.util.Log.e(LOG_TAG, "context.getCacheDir(): "
                + context.getCacheDir().toString());

        // methods below will return null if the permissions denied
        android.util.Log.e(
                LOG_TAG,
                "context.getExternalFilesDir(Environment.DIRECTORY_MOVIES): "
                        + context
                                .getExternalFilesDir(android.os.Environment.DIRECTORY_MOVIES));

        android.util.Log.e(
                LOG_TAG,
                "context.getExternalCacheDir(): "
                        + context.getExternalCacheDir());
    }

测试结果2：

getRootDirectory(): /system
getDataDirectory(): /data
getDownloadCacheDirectory(): /data/cache
getExternalStorageDirectory(): /storage/emulated/0
getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES): /storage/emulated/0/Pictures
context.getFilesDir(): /data/user/0/com.example.mushr.myapplication/files
context.getCacheDir(): /data/user/0/com.example.mushr.myapplication/cache
context.getExternalFilesDir(Environment.DIRECTORY_MOVIES): /storage/emulated/0/Android/data/com.example.mushr.myapplication/files/Movies
context.getExternalCacheDir(): /storage/emulated/0/Android/data/com.example.mushr.myapplication/cache

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