java程式碼

 1 package com.example.myapplication;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.content.SharedPreferences;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.EditText;
10 import android.widget.TextView;
 
11 import android.widget.Toast;
12 
13 publicclassSharedActivity extends AppCompatActivity {
14 privateEditText shared1;
15 privateButton shared2,shared3;
16 privateTextView shared4;
17 privateSharedPreferences mSharedPreferences;
18 privateSharedPreferences.Editor mEditor;
19 @Override
20 protectedvoid
 
onCreate(Bundle savedInstanceState) {
21 super.onCreate(savedInstanceState);
22 setContentView(R.layout.activity_shared);
23 shared1=findViewById(R.id.shared1);
24 shared2=findViewById(R.id.shared2);
25 shared3=findViewById(R.id.shared3);
26 shared4=findViewById(R.id.shared4);
27 
28 mSharedPreferences=getSharedPreferences("data",MODE_PRIVATE);
 
29 mEditor=mSharedPreferences.edit();
30 
31 shared2.setOnClickListener(newView.OnClickListener() {
32 @Override
33 publicvoidonClick(View view) {
34 mEditor.putString("name",shared1.getText().toString());
35 mEditor.commit();
36 Toast.makeText(SharedActivity.this,"儲存完畢",Toast.LENGTH_SHORT).show();
37 }
38 });
39 shared3.setOnClickListener(newView.OnClickListener() {
40 @Override
41 publicvoidonClick(View view) {
42 shared4.setText(mSharedPreferences.getString("name",""));
43 }
44 });
45 }

xml

 1 <?xml version="1.0"encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 android:layout_width="match_parent"
 4 android:layout_height="match_parent"
 5 android:orientation="vertical"
 6 android:padding="10dp"
 7 >
 8 <EditText
 9 android:layout_marginTop="50dp"
10 android:id="@+id/shared1"
11 android:layout_width="match_parent"
12 android:layout_height="wrap_content"
13 android:hint="請輸入要儲存的名字："
14 android:textSize="20sp"/>
15 <Button
16 android:layout_marginTop="20dp"
17 android:id="@+id/shared2"
18 android:layout_width="match_parent"
19 android:layout_height="wrap_content"
20 android:textSize="20dp"
21 android:text="儲存"/>
22 <Button
23 android:id="@+id/shared3"
24 android:layout_marginTop="20dp"
25 android:layout_width="match_parent"
26 android:layout_height="wrap_content"
27 android:textSize="20dp"
28 android:text="檢視"/>
29 <TextView
30 android:layout_marginTop="40dp"
31 android:id="@+id/shared4"
32 android:layout_width="match_parent"
33 android:layout_height="wrap_content"
34 android:textSize="20dp"/>
35 
36 </LinearLayout>