数据存储——四种存储方式——存储卡的文件操作——私有存储空间与公共存储空间...

朱雀 2023-09-28 14:30 11阅读 0赞

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package com.example.myapplication;
    
    import android.os.Build;
    import android.os.Environment;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.TextView;
    
    public class MainActivity extends AppCompatActivity
    {
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            TextView tv_path = findViewById(R.id.tv_path);
    
            // Android7.0之后默认禁止访问公共存储目录
            // 获取系统的公共存储路径
            String publicPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString();
    
            // 获取当前App的私有存储路径
            String privatePath = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).toString();
    
            boolean isLegacy = true;
    
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
            {
                // Android10的存储空间默认采取分区方式，此处判断是传统方式还是分区方式
                isLegacy = Environment.isExternalStorageLegacy();
            }
    
            String desc = "系统的公共存储路径位于" + publicPath +
                    "\n\n当前App的私有存储路径位于" + privatePath +
                    "\n\nAndroid7.0之后默认禁止访问公共存储目录" +
                    "\n\n当前App的存储空间采取" + (isLegacy?"传统方式":"分区方式");
    
            tv_path.setText(desc);
        }
    }

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小米手机：

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荣耀手机：

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<uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE" />  
<uses-permission android:name="android.permission.READ\_EXTERNAL\_STORAGE" />

<uses-permission android:name="android.permission.MANAGE\_EXTERNAL\_STORAGE" />

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