android7.1 获取内部写入权限

android studio版本：3.4.1

build.gradle: 必须按照以下版本写，否则api25以上无法获取权限

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25    //这里提示要26以上，会红色报错，不管他
    defaultConfig {
        applicationId "com.example.evan.test"
        minSdkVersion 25
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:25.0.0'    //这里跟上面一样
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation files('libs/commons-io-2.6.jar')
    implementation 'org.jetbrains:annotations-java5:15.0'
    implementation 'com.android.support:support-annotations:28.0.0'
}

androidmanifest

    
    
    
    roundIcon
    
    
    
    
        
            
                

                
            
        
        
            
                
            
        
        
            
                
                
                
            
        
        
            
                
                
            
        
    

main

String macString="";    //mac地址
    private  static String[]PERMISSIONS_STORAGE={  //需要的權限數組
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS,
            Manifest.permission.INTERNET,
            Manifest.permission.INSTALL_PACKAGES,
    };
    //请求状态码
    private static int REQUEST_PERMISSION_CODE = 1;
    private TextView textView;
//    private String sdcardPath;  //内存路径
    Reader reader = null;
    File file=null;
    String tvShowString="";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.tv_show);
        textView.setMovementMethod(ScrollingMovementMethod.getInstance());
//////////////////////单独获取权限
        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP) {   //判断是否android6.0以上
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_PERMISSION_CODE);

            }
            for(int i=0;i

输出：

2013-01-18 18:28:27.075 4687-4687/? I/wp----->: 执行完android.permission.WRITE_EXTERNAL_STORAGE权限为--》0
2013-01-18 18:28:27.076 4687-4687/? I/wp----->: 执行完android.permission.READ_EXTERNAL_STORAGE权限为--》0
2013-01-18 18:28:27.076 4687-4687/? I/wp----->: 执行完android.permission.MOUNT_UNMOUNT_FILESYSTEMS权限为--》-1
2013-01-18 18:28:27.077 4687-4687/? I/wp----->: 执行完android.permission.INTERNET权限为--》0
2013-01-18 18:28:27.077 4687-4687/? I/wp----->: 执行完android.permission.INSTALL_PACKAGES权限为--》-1