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Android中文件存储操作：
- Activity的openFileOutput（）方法可以用于把数据输出到文件中
- 创建的文件保存在/data/data/<package name>/files目录
- 实现过程与在java 中保存数据到文件一样
File file = this.getFilesDir();
//返回当前默认的数据存储目录
File file = this.getFilesDir();
//返回当前默认的缓存文件的存储目录
File file = this.getDir("test", MODE_PRIVATE);
//返回名为test的目录，不存在则新建
File file = this.getExternalCacheDir();
//可以得到外部的存储位置 该位置的数据跟内置使用一样
FileInputStream和FileOutputStream
example：*------------------------------------------------------------------------------------
et = (EditText) findViewById(R.id.editText1);
bt= (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.textView1);
bt.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
writeFile(et.getText().toString());
tv.setText(readFile());
}
});
}
public void writeFile(String content)
{
FileOutputStream fos = null;
try {
fos = openFileOutput("a.txt", MODE_PRIVATE);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
fos.write(content.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String readFile()
{
String text = null;
FileInputStream fis = null;
try {
fis = openFileInput("a.txt");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ByteArrayOutputStream baos= new ByteArrayOutputStream();
byte []buffer = new byte[1024];
int len =0;
try {
while((len=fis.read(buffer))!=-1)
{
baos.write(buffer, 0, len);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
text = baos.toString();
try {
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
baos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return text;
} et = (EditText) findViewById(R.id.editText1);
bt= (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.textView1);
bt.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
writeFile(et.getText().toString());
tv.setText(readFile());
}
});
}
public void writeFile(String content)
{
FileOutputStream fos = null;
try {
fos = openFileOutput("a.txt", MODE_PRIVATE);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
fos.write(content.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String readFile()
{
String text = null;
FileInputStream fis = null;
try {
fis = openFileInput("a.txt");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ByteArrayOutputStream baos= new ByteArrayOutputStream();
byte []buffer = new byte[1024];
int len =0;
try {
while((len=fis.read(buffer))!=-1)
{
baos.write(buffer, 0, len);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
text = baos.toString();
try {
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
baos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return text;
}
File
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原文地址：http://blog.csdn.net/qq_29627885/article/details/51335544
