Android获取系统读取权限

第一步在Androidifest.xml文件中加上授权语句

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

并且在Application标签下添加 android:requestLegacyExternalStorage=“true”

 android:requestLegacyExternalStorage="true"

如果不加这条语句，会报错：open failed: EACCES (Permission denied)
详情见如下图：

第二步在Activity中添加动态授权语句

详细代码如下：

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;import android.Manifest;
import android.annotation.SuppressLint;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;public class MainActivity extends AppCompatActivity {//请求码private static String[] PERMISSIONS_STORAGE = {Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE};//请求状态码private static int REQUEST_PERMISSION_CODE = 1;@SuppressLint("MissingInflatedId")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/*获取读写权限*/if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_PERMISSION_CODE);}}}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);if (requestCode == REQUEST_PERMISSION_CODE) {for (int i = 0; i < permissions.length; i++) {Log.i("MainActivity", "申请的权限为：" + permissions[i] + ",申请结果：" + grantResults[i]);}}}
}