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Android 访问 /storage/emulated/0 报 Permission denied 的问题

要想读写 /storage/emulated/0 需要做到如下几点：

  • 在清单文件 AndroidManifest.xml 文件中增加：

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

  • 手动请求权限

    private static final int REQUEST_PERMISSION_CODE = 1;    
private void requestPermissions() {
    int permission_write = ContextCompat.checkSelfPermission(MainActivity.this,
                                                             Manifest.permission.WRITE_EXTERNAL_STORAGE);
    int permission_read = ContextCompat.checkSelfPermission(MainActivity.this,
                                                            Manifest.permission.READ_EXTERNAL_STORAGE);
    if (permission_read != PackageManager.PERMISSION_GRANTED ||
        permission_write != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{
            Manifest.permission.READ_EXTERNAL_STORAGE,              Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION_CODE);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == REQUEST_PERMISSION_CODE) {

    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

  • 在清单文件中 application 标签增加属性：

    android:requestLegacyExternalStorage="true"

参考资料