//sd寫文件
public void write(View v){
//得到sd卡的狀態 狀態
String state=Environment.getExternalStorageState();//如果sd卡是存在的 安裝好的 就把問價 寫到sd卡里面
if(state.equals(Environment.MEDIA_MOUNTED)){
//文件 根目錄路徑 第二個參數是創建的文件名字
File file=new File(Environment.getExternalStorageDirectory(),"a.txt");
try {
//輸出流
FileOutputStream fos=new FileOutputStream(file);
fos.write("1507ccc".getBytes());
fos.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} }
}
//讀文件
public void read(View v){
File file=new File(Environment.getExternalStorageDirectory(), "a.txt");
try {
FileInputStream fis=new FileInputStream(file);
//字符輸入流 轉換爲字符流? 轉換流
//緩衝流 相當於村粗空間
BufferedReader br=new BufferedReader(new InputStreamReader(fis));
String readLine = br.readLine();
System.out.println(readLine);
} catch (Exception e) {
e.printStackTrace();
}
}
//讀取空間
public void readspace(View v){
//計算空間大小
TextView tv1=(TextView) findViewById(R.id.tv_neibu);
TextView tv2=(TextView) findViewById(R.id.tv_sd);
//先得到內部空間的總大小 目錄
File file=Environment.getDataDirectory();
long totalSpace = file.getTotalSpace();
//得到sd卡的總空間 mb 目錄 路徑
File sdfile=Environment.getExternalStorageDirectory();
long totalSpace2 = sdfile.getTotalSpace();
//這裏纔是計算
String fileSize = Formatter.formatFileSize(this, totalSpace);
String sdSize = Formatter.formatFileSize(this, totalSpace2);
tv1.setText(fileSize);
tv2.setText(sdSize);
}
//掃描sd卡里面的音樂
public void forsdcard(View v){
File file=Environment.getExternalStorageDirectory();
File[] filelist=file.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
if(pathname.isDirectory()){
return true;
}else if(pathname.getName().endsWith(".mp3")){
return true;
}
return false;
}
});
//遍歷出 所有返回true的文件
for (File file2 : filelist) {
//讀取音樂文件
}
}
/** 獲取文件的路徑 **/
getCacheDir().getPath();
Environment.getDataDirectory() = /data
Environment.getDownloadCacheDirectory()
getCacheDirEnvironment.getExternalStorageDirectory() = /mnt/sdcard SD卡根目錄 Environment.getExternalStorageState();//.equlse(Envorpnment.MEDIA_MOUNTED)//狀態