1.数据持久化-SDCard
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//数据持久化-SDCardfindViewById(R.id.button1).setOnClickListener(new OnClickListener()
{ @Override
public void onClick(View v)
{
//判断SDCard是否正常加载
if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()))
{
//获取SDCard根目录
File sdcardPath = Environment.getExternalStorageDirectory();
//获取SDCard可用空间
long freeSpace = sdcardPath.getFreeSpace();
Log.e("space", freeSpace + "");
}
}
}); |
2.SharedPreferences：(data/data/包名/shared_prefs/)
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private void btn2Click()
{
// SharedPreferences sp = getPreferences(0);
SharedPreferences sp = getSharedPreferences("filename", MODE_PRIVATE);//私有模式
String str = sp.getString("value", "noread");
boolean bol = sp.getBoolean("flag", true);
textView.setText(str + " " + bol);
}
private void btn1Click()
{
// SharedPreferences sp = getPreferences(MODE_WORLD_READABLE | MODE_WORLD_WRITEABLE);//全局可读可写 SharedPreferences sp = getSharedPreferences("filename", MODE_APPEND);//指定文件名，(内容)追加模式
Editor editor = sp.edit();
String value = editText.getText().toString();
editor.putString("value", value);
editor.putBoolean("flag", false);
editor.commit();
}
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3.内部存储internalStorage:(data/data/包名/files/)
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private void btn2Click()
{
try
{
FileInputStream fis = openFileInput("fos1.txt");//读取文件
int length = 0;
byte[] buffer = new byte[1024];
while(-1 != (length = fis.read(buffer)))
{
textView.setText(new String (buffer,0,length));
}
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
private void btn1Click()
{
FileOutputStream fos = null;
try
{
fos = openFileOutput("fos1.txt",MODE_PRIVATE);//写入文件
String str = editText.getText().toString();
fos.write(str.getBytes());
fos.flush();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if( null != fos )
{
try
{
fos.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
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本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1215469，如需转载请自行联系原作者