Zi 字媒體
2017-07-25T20:27:27+00:00
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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[Android] Android 學習總集
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