手机版Android版：6.0.1（Android marshmallow）
Android目标SDK版本25
我在Android按钮中调用ActivityCompat.requestPermissions但是没有显示对话来执行它
按钮
printrequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
try{
verifyStoragePermissions(SickFragmentId.this);
}
catch(Exception e ){
Log.e("LoginActv: Save Block", e.getMessage());
e.getStackTrace();
}
String req = textViewReqNo.getText().toString();
String name = Name.getText().toString();
String branch = Branch.getText().toString();
String departement_position = Departement_Position.getText().toString();
String status = Status.getText().toString();
String description = Description.getText().toString();
String type = Status.getText().toString();
String date = Date.getText().toString();
Intent showId = new Intent(SickFragmentId.this, print.class);
startActivity(showId);
}
});
我把代码放在Print.java
中public class print extends Activity {
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
public static void verifyStoragePermissions(Activity activity) {
int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
Log.e("Permission value", permission + " ");
if (permission != 1) {
Log.e("Permission ask", "Asking, permission not granted");
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 200) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Log.e("PERResult", "Granted");
String FILE = Environment.getExternalStorageDirectory().toString()
+ "/PDF/" + "AldanRIZKISANTOSA.pdf";
Document document = new Document(PageSize.A4);
// Create Directory in External Storage
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/PDF");
myDir.mkdirs();
// Create Pdf Writer for Writting into New Created Document
try {
PdfWriter.getInstance(document, new FileOutputStream(FILE));
// Open Document for Writting into document
document.open();
// User Define Method
addMetaData(document);
addTitlePage(document);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Close Document after writting all content
document.close();
Toast.makeText(this, "PDF File is Created. Location : " + FILE,
Toast.LENGTH_LONG).show();
} else {
Log.e("PERResult", "Denied");
Toast.makeText(getApplicationContext(), "PERMISSION_DENIED", Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
// Set PDF document Properties
public void addMetaData(Document document)
{
document.addTitle("RESUME");
document.addSubject("Person Info");
document.addKeywords("Personal, Education, Skills");
document.addAuthor("TAG");
document.addCreator("TAG");
}
public void addTitlePage(Document document) throws DocumentException {
// Font Style for Document
Font catFont = new Font(Font.FontFamily.TIMES_ROMAN, 18, Font.BOLD);
Font titleFont = new Font(Font.FontFamily.TIMES_ROMAN, 22, Font.BOLD
| Font.UNDERLINE, BaseColor.GRAY);
Font smallBold = new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.BOLD);
Font normal = new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.NORMAL);
// Start New Paragraph
Paragraph prHead = new Paragraph();
// Set Font in this Paragraph
prHead.setFont(titleFont);
// Add item into Paragraph
prHead.add("RESUME – Name\n");
// Create Table into Document with 1 Row
PdfPTable myTable = new PdfPTable(1);
// 100.0f mean width of table is same as Document size
myTable.setWidthPercentage(100.0f);
// Create New Cell into Table
PdfPCell myCell = new PdfPCell(new Paragraph(""));
myCell.setBorder(Rectangle.BOTTOM);
// Add Cell into Table
myTable.addCell(myCell);
prHead.setFont(catFont);
prHead.add("\nName1 Name2\n");
prHead.setAlignment(Element.ALIGN_CENTER);
// Add all above details into Document
document.add(prHead);
document.add(myTable);
document.add(myTable);
// Now Start another New Paragraph
Paragraph prPersinalInfo = new Paragraph();
prPersinalInfo.setFont(smallBold);
prPersinalInfo.add("Address 1\n");
prPersinalInfo.add("Address 2\n");
prPersinalInfo.add("City: SanFran. State: CA\n");
prPersinalInfo.add("Country: USA Zip Code: 000001\n");
prPersinalInfo
.add("Mobile: 9999999999 Fax: 1111111 Email: john_pit@gmail.com \n");
prPersinalInfo.setAlignment(Element.ALIGN_CENTER);
document.add(prPersinalInfo);
document.add(myTable);
document.add(myTable);
Paragraph prProfile = new Paragraph();
prProfile.setFont(smallBold);
prProfile.add("\n \n Profile : \n ");
prProfile.setFont(normal);
prProfile
.add("\nI am Mr. XYZ. I am Android Application Developer at TAG.");
prProfile.setFont(smallBold);
document.add(prProfile);
// Create new Page in PDF
document.newPage();
}
}
但是权限对话框没有显示
在我使用ActivityCompat.requestPermissions之前我有错误
java.io.FileNotFoundException: /storage/emulated/0/PDF/Name.pdf (Permission denied)
我使用ActivityCompat.requestPermission后出错
E/Permission value: -1
E/Permission ask: Asking, permission not granted
答案 0 :(得分：0)
在onCreate()方法中;
requestStoragePermission();
并定义此方法;
private void requestStoragePermission() {
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.GET_ACCOUNTS) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)
return;
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED)
return;
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)) {
//If the user has denied the permission previously your code will come to this block
//Here you can explain why you need this permission
//Explain here why you need this permission
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.ACCESS_FINE_LOCATION)) {
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.GET_ACCOUNTS)) {
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_CONTACTS)) {
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.CAMERA)) {
}
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_PHONE_STATE)) {
}
//And finally ask for the permission
ActivityCompat.requestPermissions(this, new String[]
{
android.Manifest.permission.READ_EXTERNAL_STORAGE,
android.Manifest.permission.WRITE_EXTERNAL_STORAGE,
android.Manifest.permission.ACCESS_FINE_LOCATION,
android.Manifest.permission.GET_ACCOUNTS,
android.Manifest.permission.READ_CONTACTS,
android.Manifest.permission.CAMERA,
android.Manifest.permission.READ_PHONE_STATE
}, STORAGE_PERMISSION_CODE);
}
//This method will be called when the user will tap on allow or deny
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//Checking the request code of our request
if (requestCode == STORAGE_PERMISSION_CODE) {
//If permission is granted
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//Displaying a toast
Toast.makeText(this, "Permission granted now you can read the storage", Toast.LENGTH_LONG).show();
} else {
//Displaying another toast if permission is not granted
Toast.makeText(this, "Oops you just denied the permission", Toast.LENGTH_LONG).show();
}
}
}
答案 1 :(得分：0)
if( hasPermissionWriteExternalStorage()){
//do smth
}
public boolean hasPermissionWriteExternalStorage() {
if (Build.VERSION.SDK_INT >= 23) {
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
return true;
} else {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_WRITE_EXTERNAL_STORAGE);
return false;
}
} else { //permission is automatically granted on sdk<23 upon installation
return true;
}
}
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {case PERMISSION_WRITE_EXTERNAL_STORAGE: {
if (getActivity().checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
//do smth
} else {
Toast.makeText(getActivity(), "Access Denied", Toast.LENGTH_SHORT).show();
}
break;
}
}
}