我应该如何获得相机和外部存储的android权限

概述我在我的应用程序中有两个权限,它们基于访问相机和外部存储,但是我面临的问题是,在启动应用程序时仅要求相机权限,而没有要求其他权限.但是在第二阶段,当我运行应用程序时,它请求了第二个权限.publicclassMainActivityextendsAppCompatActivity{privateDrawerLayoutmDr

我在我的应用程序中有两个权限,它们基于访问相机和外部存储,但是我面临的问题是,在启动应用程序时仅要求相机权限,而没有要求其他权限.

但是在第二阶段,当我运行应用程序时,它请求了第二个权限.

public class MainActivity extends AppCompatActivity {private DrawerLayout mDrawer;private Toolbar toolbar;private NavigationVIEw nvDrawer;private ActionbarDrawerToggle drawerToggle;private static final int REQUEST_CAMERA = 0;private static final int REQUEST_EXTERNAL_STORAGE = 1;private static String[] PERMISSION_EXTERNAL = {Manifest.permission.WRITE_EXTERNAL_STORAGE,        Manifest.permission.READ_EXTERNAL_STORAGE};@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    if (ContextCompat.checkSelfPermission(this,            Manifest.permission.CAMERA) !=            PackageManager.PERMISSION_GRANTED) {        if (ActivityCompat.shouldShowRequestPermissionRationale(this,                Manifest.permission.CAMERA)) {            // Show an explanation to the user *asynchronously* -- don't block            // this thread waiting for the user's response! After the user            // sees the explanation, try again to request the permission.        } else {            ActivityCompat.requestPermissions(MainActivity.this,                    new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);        }    } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)            != PackageManager.PERMISSION_GRANTED            || ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)            != PackageManager.PERMISSION_GRANTED) {        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)                || ActivityCompat.shouldShowRequestPermissionRationale(this,                Manifest.permission.READ_EXTERNAL_STORAGE)) {            // Show an explanation to the user *asynchronously* -- don't block            // this thread waiting for the user's response! After the user            // sees the explanation, try again to request the permission.        } else {            ActivityCompat.requestPermissions(MainActivity.this,                    PERMISSION_EXTERNAL, REQUEST_EXTERNAL_STORAGE);        }    }    setContentVIEw(R.layout.activity_main);    toolbar = (Toolbar) findVIEwByID(R.ID.toolbar);    setSupportActionbar(toolbar);    nvDrawer = (NavigationVIEw) findVIEwByID(R.ID.nvVIEw);    mDrawer = (DrawerLayout) findVIEwByID(R.ID.drawer_layout);    setupDrawerContent(nvDrawer);    drawerToggle = setupDrawerToggle();    mDrawer.addDrawerListener(drawerToggle);}@OverrIDepublic voID onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {    if (requestCode == REQUEST_CAMERA) {        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {            //granted        } else {            ActivityCompat.requestPermissions(MainActivity.this,                    new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);        }    } else if (requestCode != REQUEST_EXTERNAL_STORAGE) {        if (PermissionUtil.verifyPermission(grantResults)) {            //Has been granted        } else {            //Not granted for permission        }    } else {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);    }}private ActionbarDrawerToggle setupDrawerToggle() {    return new ActionbarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);}private voID setupDrawerContent(NavigationVIEw navigationVIEw) {    navigationVIEw.setNavigationItemSelectedListener(            new NavigationVIEw.OnNavigationItemSelectedListener() {                @OverrIDe                public boolean onNavigationItemSelected(MenuItem menuItem) {                    selectDrawerItem(menuItem);                    return true;                }            });}private voID selectDrawerItem(MenuItem menuItem) {}@OverrIDeprotected voID onPostCreate(Bundle savedInstanceState) {    super.onPostCreate(savedInstanceState);    drawerToggle.syncState();}@OverrIDepublic voID onConfigurationChanged(Configuration newConfig) {    super.onConfigurationChanged(newConfig);    drawerToggle.onConfigurationChanged(newConfig);}@OverrIDepublic boolean onoptionsItemSelected(MenuItem item) {    if (drawerToggle.onoptionsItemSelected(item)) {        return true;    }    return super.onoptionsItemSelected(item);}

}

实用程序类,用于检查androID上的多个权限以进行读取和写入外部权限

public abstract class PermissionUtil {public static boolean verifyPermission(int[] grantResults){    // At least one result must be checked.    if (grantResults.length > 0){        return false;    }    for (int results :grantResults){        if (results != PackageManager.PERMISSION_GRANTED){            return false;        }    }    return true;}

}

甚至我都允许清单中的所有人.

解决方法:

您可以将多个权限添加到列表中.

检查多个权限的方法

public static final int REQUEST_ID_MulTIPLE_PERMISSIONS = 101;public static boolean checkAndRequestPermissions(final Activity context) {    int ExtstorePermission = ContextCompat.checkSelfPermission(context,            Manifest.permission.READ_EXTERNAL_STORAGE);    int cameraPermission = ContextCompat.checkSelfPermission(context,            Manifest.permission.CAMERA);    List<String> ListPermissionsNeeded = new ArrayList<>();    if (cameraPermission != PackageManager.PERMISSION_GRANTED) {        ListPermissionsNeeded.add(Manifest.permission.CAMERA);    }    if (WExtstorePermission != PackageManager.PERMISSION_GRANTED) {        ListPermissionsNeeded                .add(Manifest.permission.WRITE_EXTERNAL_STORAGE);    }    if (!ListPermissionsNeeded.isEmpty()) {        ActivityCompat.requestPermissions(context, ListPermissionsNeeded                .toArray(new String[ListPermissionsNeeded.size()]),                REQUEST_ID_MulTIPLE_PERMISSIONS);        return false;    }    return true;}

像这样使用

if(checkAndRequestPermissions(MainActivity.this)){    doWork();}

并处理PermissionsResult之类的,

@OverrIDepublic voID onRequestPermissionsResult(int requestCode,String[] permissions, int[] grantResults) {    switch (requestCode) {        case Utility.REQUEST_ID_MulTIPLE_PERMISSIONS:            if (ContextCompat.checkSelfPermission(MainActivity.this,                    Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {                Toast.makeText(getApplicationContext(),                        "FlagUp Requires Access to Camara.", Toast.LENGTH_SHORT)                        .show();                finish();            } else if (ContextCompat.checkSelfPermission(Splash_Activity.this,                    Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {                Toast.makeText(getApplicationContext(),                        "FlagUp Requires Access to Your Storage.",                        Toast.LENGTH_SHORT).show();                finish();            } else {                doWork();            }            break;    }}

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