Android中访问sdcard路径的几种方式

public class MainActivity extends AppCompatActivity { ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv= (ImageView) findViewById(R.id.iv); } public void load(View view){ //第一种：直接引用全部的目录（4.1之前使用，之后不建议这样用）// Bitmap bm = BitmapFactory.decodeFile("/storage/emulated/0/Download/tianxingjiuge.jpg"); //第二种：/storage/emulated/0这一段的路径可以用Environment.getExternalStorageDirectory()// Bitmap bm = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory() +//  "/Download/tianxingjiuge.jpg"); //第三种：使用Environment.getExternalStoragePublicDirectory(String type)函数调用不同类型的文件目录 Bitmap bm = BitmapFactory.decodeFile(Environment.getExternalStoragePublicDirectory  (Environment.DIRECTORY_DOWNLOADS) + "/tianxingjiuge.jpg"); iv.setImageBitmap(bm); }}

• DIRECTORY_ALARMS //警报铃声• DIRECTORY_DCIM //相机拍摄的图片和视频• DIRECTORY_DOWNLOADS //下载文件保存• DIRECTORY_MOVIES //电影的保存，比如通过google play下载的电影• DIRECTORY_MUSIC //音乐保存• DIRECTORY_NOTIFICATIONS //通知音乐保存• DIRECTORY_PICTURES //下载的图片• DIRECTORY_PODCASTS //用于保存podcast(博客)的音频文件• DIRECTORY_RINGTONES //保存铃声