读取Application全局内存_android application.applicationcontent

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:orientation="vertical"
    android:padding="10dp" >
 
    <TextView
        android:id="@+id/tv_app"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/black"
        android:textSize="17sp" />
 
</LinearLayout>

package com.example.forth;
import android.os.Bundle;
 
import androidx.appcompat.app.AppCompatActivity;
 
 
import android.widget.TextView;
import android.widget.Toast;
 
import java.util.Map;
 
 
public class MainActivity extends AppCompatActivity  {
    private TextView tv_app;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_app_read);
        tv_app = findViewById(R.id.tv_app);
        readAppMemory();
    }
 
    // 读取全局内存中保存的变量信息
    private void readAppMemory() {
        String desc = "全局内存中保存的信息如下：";
        // 获取当前应用的Application实例
        MainApplication app = MainApplication.getInstance();
        // 获取Application实例中保存的映射全局变量
        Map<String, String> mapParam = app.mInfoMap;
        // 遍历映射全局变量内部的键值对信息
        for (Map.Entry<String, String> item_map : mapParam.entrySet()) {
            desc = String.format("%s\n　%s的取值为%s",
                    desc, item_map.getKey(), item_map.getValue());
        }
        if (mapParam.size() <= 0) {
            desc = "全局内存中保存的信息为空";
        }
        tv_app.setText(desc);
    }
 
    private void showToast(String desc) {
        Toast.makeText(this, desc, Toast.LENGTH_SHORT).show();
    }
}