如何使用Kotlin请求权限。
我正在尝试拨打电话功能
fun buChargeEvent(view: View){
var number: Int = txtCharge.text.toString().toInt()
val intentChrage = Intent(Intent.ACTION_CALL)
intent.data = Uri.parse("tel:$number")
startActivity(intentChrage)
}
我在清单中添加了用户权限，但仍然具有相同的error 。
您需要先为清单添加权限
<uses-permission android:name="android.permission.CALL_PHONE" />
在清单中添加权限后，以下代码可以正常工作“Number_to_call”将是您需要更换的号码
val call = Intent(Intent.ACTION_DIAL)
call.setData(Uri.parse("tel:" +"Number_to_call"))
startActivity(call)
您需要请求运行时权限，因为Android 6.0某些权限要求您在安装时询问并在运行时再次询问。
按照说明，here解释了如何在运行时请求权限。
您需要添加运行时权限。 Download the source code from here
//点击布局功能：
rl_call.setOnClickListener {
if (boolean_call) {
phonecall()
}else {
fn_permission(Manifest.permission.CALL_PHONE,CALLMODE)
}
}
//请求权限响应
fun fn_permission(permission:String,mode:Int){
requestPermissions(permission, object : PermissionCallBack {
override fun permissionGranted() {
super.permissionGranted()
Log.v("Call permissions", "Granted")
boolean_call=true
phonecall()
}
override fun permissionDenied() {
super.permissionDenied()
Log.v("Call permissions", "Denied")
boolean_call=false
}
})
}
//调用intent的函数
fun phonecall() {
val intent = Intent(Intent.ACTION_CALL);
intent.data = Uri.parse("tel:1234567890s")
startActivity(intent)
}
谢谢！
首先，您需要首先为manifest添加权限：
<uses-permission android:name="android.permission.CALL_PHONE" />
这段代码用于您的方法的位置：
fun buChargeEvent(view: View) {
var number: Int = txtCharge.text.toString().toInt()
val callIntent = Intent(Intent.ACTION_CALL)
callIntent.data = Uri.parse("tel:$number")
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this as Activity,
Manifest.permission.CALL_PHONE)) {
} else {
ActivityCompat.requestPermissions(this,
arrayOf(Manifest.permission.CALL_PHONE),
MY_PERMISSIONS_REQUEST_CALL_PHONE)
}
}
startActivity(callIntent)
}
这是Call Phone的运行时权限的完整代码
第1步： - 在清单中添加权限
<uses-permission android:name="android.permission.CALL_PHONE" />
第2步： - 在
checkAndroidVersion()中调用此方法onCreate()
fun checkAndroidVersion() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkAndRequestPermissions()) {
} else {
}
} else {
// do code for pre-lollipop devices
}
}
val REQUEST_ID_MULTIPLE_PERMISSIONS = 1
fun checkAndRequestPermissions(): Boolean {
val call = ContextCompat.checkSelfPermission(this@MainActivity, Manifest.permission.CALL_PHONE)
val listPermissionsNeeded = ArrayList<String>()
if (call != PackageManager.PERMISSION_GRANTED) {
listPermissionsNeeded.add(Manifest.permission.CALL_PHONE)
}
if (!listPermissionsNeeded.isEmpty()) {
ActivityCompat.requestPermissions(this@MainActivity, listPermissionsNeeded.toTypedArray(), REQUEST_ID_MULTIPLE_PERMISSIONS)
return false
}
return true
}
fun checkAndRequestPermissions(): Boolean {
val call = ContextCompat.checkSelfPermission(this@MainActivity, Manifest.permission.CALL_PHONE)
val listPermissionsNeeded = ArrayList<String>()
if (call != PackageManager.PERMISSION_GRANTED) {
listPermissionsNeeded.add(Manifest.permission.CALL_PHONE)
}
if (!listPermissionsNeeded.isEmpty()) {
ActivityCompat.requestPermissions(this@MainActivity, listPermissionsNeeded.toTypedArray(), REQUEST_ID_MULTIPLE_PERMISSIONS)
return false
}
return true
}
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<String>, grantResults: IntArray) {
Log.d("in fragment on request", "Permission callback called-------")
when (requestCode) {
REQUEST_ID_MULTIPLE_PERMISSIONS -> {
val perms = HashMap<String, Int>()
// Initialize the map with both permissions
perms[Manifest.permission.CALL_PHONE] = PackageManager.PERMISSION_GRANTED
// Fill with actual results from user
if (grantResults.size > 0) {
for (i in permissions.indices)
perms[permissions[i]] = grantResults[i]
// Check for both permissions
if (perms[Manifest.permission.CALL_PHONE] == PackageManager.PERMISSION_GRANTED
) {
print("Storage permissions are required")
// process the normal flow
//else any one or both the permissions are not granted
} else {
Log.d("in fragment on request", "Some permissions are not granted ask again ")
//permission is denied (this is the first time, when "never ask again" is not checked) so ask again explaining the usage of permission
// // shouldShowRequestPermissionRationale will return true
//show the dialog or snackbar saying its necessary and try again otherwise proceed with setup.
if (ActivityCompat.shouldShowRequestPermissionRationale(this@MainActivity, Manifest.permission.WRITE_EXTERNAL_STORAGE) || ActivityCompat.shouldShowRequestPermissionRationale(this@MainActivity, Manifest.permission.CAMERA) || ActivityCompat.shouldShowRequestPermissionRationale(this@MainActivity, Manifest.permission.READ_EXTERNAL_STORAGE) || ActivityCompat.shouldShowRequestPermissionRationale(this@MainActivity, Manifest.permission.ACCESS_FINE_LOCATION)) {
showDialogOK("Call permission is required for this app",
DialogInterface.OnClickListener { dialog, which ->
when (which) {
DialogInterface.BUTTON_POSITIVE -> checkAndRequestPermissions()
DialogInterface.BUTTON_NEGATIVE -> {
}
}// proceed with logic by disabling the related features or quit the app.
})
} else {
Toast.makeText(this@MainActivity, "Go to settings and enable permissions", Toast.LENGTH_LONG)
.show()
// //proceed with logic by disabling the related features or quit the app.
}//permission is denied (and never ask again is checked)
//shouldShowRequestPermissionRationale will return false
}
}
}
}
}
fun showDialogOK(message: String, okListener: DialogInterface.OnClickListener) {
AlertDialog.Builder(this@MainActivity)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", okListener)
.create()
.show()
}
**Step 3**:- On button click
fun buChargeEvent(view: View){
if(checkAndRequestPermissions(){
var number: Int = txtCharge.text.toString().toInt()
val intentChrage = Intent(Intent.ACTION_CALL)
intent.data = Uri.parse("tel:$number")
startActivity(intentChrage)
}
}