[Android] SharedPreferences 儲存進度

簡單來說就是在APP關閉之後，執行的資料會被保存在手機，下一次開啟時再載入上次儲存的資料

示範

XML

xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context="com.share.saioyanr.share.MainActivity">

    <EditText
        android:id="@+id/ed1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.502"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.12" />

    <Button
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="OK"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <TextView
        android:id="@+id/t1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="TextView"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity {
    EditText ed1;
    TextView t1;
    SharedPreferences userSettings ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed1 = (EditText) findViewById(R.id.ed1);
        t1= (TextView)findViewById(R.id.t1);





        userSettings = getSharedPreferences("setting", 0);
        String name = userSettings.getString("name","默認值");
        String text = userSettings.getString("text","默認值");
        ed1.setText(""+name);
        t1.setText(""+text);
    }
    public void onClick(View v){
        t1.setText(String.valueOf(ed1.getText()));

        SharedPreferences userSettings = getSharedPreferences("setting", 0);
        SharedPreferences.Editor editor = userSettings.edit();
        editor.putString("name", String.valueOf(ed1.getText()));
        editor.putString("text", String.valueOf(t1.getText()));
        editor.commit();
    }
}

展示

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