XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnWrite"
android:layout_width="match_parent"
android:layout_marginTop="20dp"
android:layout_height="wrap_content"
android:text="sp存储" />
<Button
android:id="@+id/btnRead"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="sp读取" />
<Button
android:id="@+id/btnfileWrite"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="文件存储" />
<Button
android:id="@+id/btnfileRead"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="文件读取" />
<Button
android:id="@+id/btnFileWriteToSd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SDCard存储" />
<Button
android:id="@+id/btnFileReadToSd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SDCard读取" />
</LinearLayout>
Activity:
public class ShareActivity extends Activity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sharepreference);
findViewById(R.id.btnWrite).setOnClickListener(this);
findViewById(R.id.btnRead).setOnClickListener(this);
findViewById(R.id.btnFileWriteToSd).setOnClickListener(this);
findViewById(R.id.btnfileWrite).setOnClickListener(this);
findViewById(R.id.btnfileRead).setOnClickListener(this);
findViewById(R.id.btnFileReadToSd).setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnWrite:
SharedPreferences sp = getSharedPreferences("setting",
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString("name", "张三");
editor.putInt("age", 25);
editor.putInt("weight", 120);
editor.commit();
break;
case R.id.btnRead:
SharedPreferences spread = getSharedPreferences("setting",
Context.MODE_PRIVATE);
String name = spread.getString("name", "null");
int age = spread.getInt("age", 18);
int weight = spread.getInt("weight", 15);
Toast.makeText(this, name + "--" + age + "--" + weight,
Toast.LENGTH_LONG).show();
break;
case R.id.btnfileWrite:
writeFile();
break;
case R.id.btnfileRead:
readFile();
break;
case R.id.btnFileWriteToSd:
writeFilesToSDCard();
break;
case R.id.btnFileReadToSd:
readFilesFromSDCard();
break;
}
}
// 写文件
public void writeFile() {
FileOutputStream os = null;
try {
os = this.openFileOutput("jerei.txt", Context.MODE_PRIVATE);
os.write("姓名：张三".getBytes());
os.write("年龄：25".getBytes());
os.write("体重：100".getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
os = null;
}
}
}
//读文件
public void readFile() {
FileInputStream is = null;
StringBuilder sb = new StringBuilder();
try {
is = this.openFileInput("jerei.txt");
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
String tmp = new String(buffer, 0, len);
sb.append(tmp);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
}
//存进SD卡
public void writeFilesToSDCard() {
String filePath = null;
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 获取SDCard根路径
filePath = Environment.getExternalStorageDirectory().toString();
filePath = filePath + File.separator + "jerei" + File.separator
+ "edu";
File fileParent = new File(filePath);
if (!fileParent.exists()) {
fileParent.mkdirs();
}
FileOutputStream os = null;
try {
os = new FileOutputStream(new File(fileParent, "a.txt"));
os.write("向SDCard中写入文件！！".getBytes());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
//读取SD卡
public void readFilesFromSDCard(){
FileInputStream is=null;
StringBuilder sb=new StringBuilder();
try {
is=this.openFileInput("a.txt");
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
String tmp = new String(buffer, 0, len);
sb.append(tmp);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(is!=null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
}
}