public class SharedPreferencesTestActivity extends Activity implements View.OnClickListener{
  private EditText editText;
  private TextView textView;
  private Button write;
  private Button read;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_shared_preferences_test);
    initView();

    write.setOnClickListener(this);
    read.setOnClickListener(this);
  }

  private void initView() {
    editText=(EditText)findViewById(R.id.Edit_Test);
    textView=(TextView)findViewById(R.id.Text_Test);
    write=(Button)findViewById(R.id.write);
    read=(Button)findViewById(R.id.read);
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()){
      case R.id.write:
        String some=editText.getText().toString();
        SharedPreferences pref = SharedPreferencesTestActivity.this.getSharedPreferences("data",MODE_PRIVATE);
        SharedPreferences.Editor editor = pref.edit();
        editor.putString("Content",some);
        editor.commit();
        Toast.makeText(SharedPreferencesTestActivity.this, "寫(xiě)入成功" , Toast.LENGTH_LONG).show();
        editText.setText("");
        break;
      case R.id.read:
        SharedPreferences pre = getSharedPreferences("data",MODE_PRIVATE);
        String name = pre.getString("Content","");
        textView.setText(name);
        Toast.makeText(SharedPreferencesTestActivity.this, "讀取成功" , Toast.LENGTH_LONG).show();
        break;

    }
  }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context="com.fae.mobile.testActivity.SharedPreferencesTestActivity">
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <EditText

      android:textColor="@color/red"
      android:background="@null"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/Edit_Test"
      android:layout_weight="1"
      />
    <TextView
      android:textColor="@color/blue"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/Text_Test"
      android:layout_weight="1"/>
  </LinearLayout>
  <Button
    android:layout_marginTop="25dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/read"
    android:text="讀"/>
  <Button
    android:layout_marginTop="25dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/write"
    android:text="寫(xiě)"/>

</LinearLayout>