理解android6权限方法
我正在尝试从Gallery中获取图像并将其设置为imageview，但在Android 6中存在一些权限问题。下面是请求许可的方法。我应该请求读取外部存储还是写入外部存储 以下是我迄今为止所做的工作：理解android6权限方法,android,android-6.0-marshmallow,runtime-permissions,Android,Android 6.0 Marshmallow,Runtime Permissions,我正在尝试从Gallery中获取图像并将其设置为imageview，但在Android 6中存在一些权限问题。下面是请求许可的方法。我应该请求读取外部存储还是写入外部存储 以下是我迄今为止所做的工作： private static final int READ_CONTACTS_PERMISSIONS_REQUEST = 1; public void getPermissionToReadExternalStorage() { if (ContextCompat.c
private static final int READ_CONTACTS_PERMISSIONS_REQUEST = 1;
public void getPermissionToReadExternalStorage() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
if (shouldShowRequestPermissionRationale(
Manifest.permission.READ_EXTERNAL_STORAGE)) {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
READ_CONTACTS_PERMISSIONS_REQUEST);
}}}
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String permissions[],
@NonNull int[] grantResults){
// Make sure it's our original READ_CONTACTS request
if (requestCode == READ_CONTACTS_PERMISSIONS_REQUEST) {
if (grantResults.length == 1 &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getActivity(), "Read Contacts permission granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(), "Read Contacts permission denied", Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
pro.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
if (android.os.Build.VERSION.SDK_INT >= 23) {
getPermissionToReadExternalStorage();
if (getPermissionToReadExternalStorage () this???? <==)
startActivityForResult(Intent.createChooser(intent, "Select Picture"), 0);
} else {
startActivityForResult(Intent.createChooser(intent, "Select Picture"), 0);
}}
});
return v;
}
pro.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
Intent Intent=新Intent（Intent.ACTION\u PICK，android.provider.MediaStore.Images.Media.EXTERNAL\u CONTENT\u URI）；
intent.setType（“image/*”）；
如果（android.os.Build.VERSION.SDK_INT>=23）{
GetPermissionToReaderExternalStorage（）；
如果（GetPermissionToReaderExternalStoreage（），则此？？？编辑
我已经重写了代码，并在另一个答案中发布
旧答案：
是的，你每次都必须检查并请求许可
通常我会这样编写代码：
private int requestPermissionCode;
private Runnable requestPermissionRunnable;
private void runPermissionCode(String requestPermission, int requestCode, Runnable codeToRun) {
if (android.os.Build.VERSION.SDK_INT >= 23) {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissionCode = requestCode;
requestPermissionRunnable = codeToRun;
requestPermissions(new String[]{requestPermission},
requestCode);
}
} else {
codeToRun.run();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String permissions[],
@NonNull int[] grantResults) {
if (requestCode == requestPermissionCode) {
if (grantResults.length == 1 &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (requestPermissionRunnable != null)
requestPermissionRunnable.run();
} else {
Toast.makeText(getActivity(), "Permission denied", Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
runPermissionCode(Manifest.permission.READ_EXTERNAL_STORAGE, READ_CONTACTS_PERMISSIONS_REQUEST, new Runnable() {
@Override
public void run() {
// your code here
}
});
然后像这样运行它：
private int requestPermissionCode;
private Runnable requestPermissionRunnable;
private void runPermissionCode(String requestPermission, int requestCode, Runnable codeToRun) {
if (android.os.Build.VERSION.SDK_INT >= 23) {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissionCode = requestCode;
requestPermissionRunnable = codeToRun;
requestPermissions(new String[]{requestPermission},
requestCode);
}
} else {
codeToRun.run();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String permissions[],
@NonNull int[] grantResults) {
if (requestCode == requestPermissionCode) {
if (grantResults.length == 1 &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (requestPermissionRunnable != null)
requestPermissionRunnable.run();
} else {
Toast.makeText(getActivity(), "Permission denied", Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
runPermissionCode(Manifest.permission.READ_EXTERNAL_STORAGE, READ_CONTACTS_PERMISSIONS_REQUEST, new Runnable() {
@Override
public void run() {
// your code here
}
});
我确信这不是一个最好的方法，但至少它提供了一个请求权限的可能性，并使操作更容易。因此我完全重写了请求权限的代码。
现在，它支持请求多个权限并以正确的结果运行代码。
它也适用于PremarshAllow设备，因此在这种情况下，您不必检查和复制代码
首先，使用此代码创建一个Activity类（您可以扩展任何需要的活动，例如AppCompatActivity）：
您的活动和片段应该扩展这些类，而不是标准类
现在，您可以通过调用以下方法请求权限：
requestPermissions(int requestCode, String[] requestPermissions, PermissionListener permissionListener)
如果应用程序需要权限才能工作，则应调用此方法并指定消息，说明为什么需要权限
requestPermissions(int requestCode, String[] requestPermissions, String message, PermissionListener permissionListener)
不要错误调用默认方法，即
// DON'T USE THIS ONE!
requestPermissions(String[] requestPermissions, int requestCode)
// DON'T USE THIS ONE!
以下是请求联系人的示例：
private void requestAndLoadContacts() {
String[] permissions = new String[]{Manifest.permission.READ_CONTACTS};
requestPermissions(REQUEST_PERMISSIONS_CONTACTS, permissions, "Read contacts permission is required for the app to work!", new PermissionListener() {
@Override
public boolean onResult(int requestCode, String[] requestPermissions, int[] grantResults) {
// Check if the requestCode is ours
if (requestCode == REQUEST_PERMISSIONS_CONTACTS) {
// Check if the permission is correct and is granted
if (requestPermissions[0].equals(Manifest.permission.READ_CONTACTS) && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted
// Calling a method to actually load the contacts
loadContacts();
} else {
// Permission not granted
Toast.makeText(MainActivity.this, "Access denied!", Toast.LENGTH_SHORT).show();
}
return true;
}
return false;
}
});
}
注:
在实现PermissionListener时，当请求代码正确时，不要忘记返回true，否则PermissionListener将不会从ArrayList中删除，并且很可能会出现小内存泄漏。初始化您的权限
private static final int INITIAL_REQUEST = 1337;
private static final int GET_ACCOUNTS = INITIAL_REQUEST+2;
private static final int LOCATION_REQUEST =INITIAL_REQUEST+3;
private static final String[] INITIAL_PERMS = {
Manifest.permission.GET_ACCOUNTS,
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_FINE_LOCATION
};
检查设备并请求权限
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!canAccessAccounts()|| !canAccessLocation() ||!canAccessInternet()) {
requestPermissions(INITIAL_PERMS, INITIAL_REQUEST);
}
}
是否授予检查权限
private boolean canAccessAccounts() {
return (hasPermission(Manifest.permission.GET_ACCOUNTS));
}
private boolean canAccessLocation() {
return (hasPermission(Manifest.permission.ACCESS_FINE_LOCATION));
}
private boolean canAccessInternet() {
return (hasPermission(Manifest.permission.INTERNET));
}
private boolean hasPermission(String perm) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
return (PackageManager.PERMISSION_GRANTED == checkSelfPermission(perm));
}
return (true);
}
void UpdatePermissions(){
canAccessInternet();
canAccessLocation();
canAccessInternet();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
UpdatePermissions();
switch(requestCode) {
case GET_ACCOUNTS:
if (canAccessAccounts()) {
}
else {
}
break;
case LOCATION_REQUEST:
if (canAccessLocation()) {
}
else {
}
break;
case INITIAL_REQUEST:
if(canAccessInternet()){
}else {
}
break;
}
}
在RequestPermissionsResult上更新权限并检查权限的方法
private boolean canAccessAccounts() {
return (hasPermission(Manifest.permission.GET_ACCOUNTS));
}
private boolean canAccessLocation() {
return (hasPermission(Manifest.permission.ACCESS_FINE_LOCATION));
}
private boolean canAccessInternet() {
return (hasPermission(Manifest.permission.INTERNET));
}
private boolean hasPermission(String perm) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
return (PackageManager.PERMISSION_GRANTED == checkSelfPermission(perm));
}
return (true);
}
void UpdatePermissions(){
canAccessInternet();
canAccessLocation();
canAccessInternet();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
UpdatePermissions();
switch(requestCode) {
case GET_ACCOUNTS:
if (canAccessAccounts()) {
}
else {
}
break;
case LOCATION_REQUEST:
if (canAccessLocation()) {
}
else {
}
break;
case INITIAL_REQUEST:
if(canAccessInternet()){
}else {
}
break;
}
}
但是你如何使用它？或者当用户要点击某个东西时你如何使用它？这样你就可以完成你的任务了。在我的情况下，你会如何使用它？或者任何其他情况下，只需向我展示带有侦听器的代码之类的东西。谢谢，伙计。我明白了。好主意！有可能改进使用处理旧android版本的ContextCompat吗？比谢谢！但是“permissionListeners.remove（permissionListener）；”不会抛出ConcurrentModificationException吗？@Gilian会的。从那以后，我对这段代码做了很多改进。很快就会更新答案。@geNia很好的解决方案，我喜欢使用shouldShowRequestPermissionRegulation（）方法来使用消息，再次感谢！