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  • 数据存储

    java代码

    package com.example.myapplication;
      
    import androidx.appcompat.app.AppCompatActivity;
      
    import android.content.SharedPreferences;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
      
    public class SharedActivity extends AppCompatActivity {
        private EditText shared1;
        private Button shared2,shared3;
        private TextView shared4;
        private SharedPreferences mSharedPreferences;
        private SharedPreferences.Editor mEditor;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_shared);
            shared1=findViewById(R.id.shared1);
            shared2=findViewById(R.id.shared2);
            shared3=findViewById(R.id.shared3);
            shared4=findViewById(R.id.shared4);
      
            mSharedPreferences=getSharedPreferences("data",MODE_PRIVATE);
            mEditor=mSharedPreferences.edit();
      
            shared2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                   mEditor.putString("name",shared1.getText().toString());
                   mEditor.commit();
                    Toast.makeText(SharedActivity.this,"保存完毕",Toast.LENGTH_SHORT).show();
                }
            });
            shared3.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                   shared4.setText(mSharedPreferences.getString("name",""));
                }
            });
        }

    xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="10dp"
       >
        <EditText
            android:layout_marginTop="50dp"
            android:id="@+id/shared1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入要保存的名字:"
            android:textSize="20sp"/>
        <Button
            android:layout_marginTop="20dp"
            android:id="@+id/shared2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="保存"/>
        <Button
            android:id="@+id/shared3"
            android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="查看"/>
        <TextView
            android:layout_marginTop="40dp"
            android:id="@+id/shared4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"/>
      
    </LinearLayout>
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  • 原文地址:https://www.cnblogs.com/reddead/p/14164070.html
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