android读写文件

读：

Android从resource中的raw文件夹中获取文件并读取数据：

final Resources resources = getResources();
InputStream inputStream = resources.openRawResource(R.raw.area_card);


Android读取Asset里的内容
InputStream inputStream = getResources().getAssets().open("xml/Violate_dice.xml");


Android从SDCard读取文件
String fileName = "/sdcard/Y.txt";
//也可以用String fileName = "mnt/sdcard/Y.txt";
FileInputStream fis = new FileInputStream(fileName);


Android读取data/data/com.xxx.app/files/下的文件
String fileName = "txt/Y.txt";//Y.txt实际应该存在在/data/data/com.xxx.app/files/txt/Y.txt
FileInputStream fin = openFileInput(fileName); 

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写：

Android写文件到/data/data/com.xxx.app/files/

String message = "this is a string";FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);    byte [] bytes = message.getBytes();     fout.write(bytes);     fout.close(); 

Android写文件到SDCard

String fileName = "mnt/sdcard/Y.txt";String message = "this is a string";FileOutputStream fout = new FileOutputStream(fileName);    byte [] bytes = message.getBytes();     fout.write(bytes);     fout.close(); 

Android向系统节点写内容

try {BufferedWriter output = new BufferedWriter(new FileWriter(new File("/sys/power/state")));output.write("mem");output.close();} catch (Exception e) {e.printStackTrace();}