本文共 4689 字,大约阅读时间需要 15 分钟。
Android 5.0之前是注册即可获取权限,Android 5.0之后安装时可以关闭某些权限,Android 6.0开始,一些隐私权限总在第一次运行时提示是否授权。
ContextCompat.checkSelfPermission(context,permission)方法,返回值有两种:
PackageManager.PERMISSION_GRANTED PackageManager.PERMISSION_DENIED
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_CALENDAR); if (permissionCheck == PackageManager.PERMISSION_GRANTED) { Toast.makeText(PermissionActivity.this, "hava this permission", Toast.LENGTH_SHORT).show(); }else { Toast.makeText(PermissionActivity.this, "no this permission", Toast.LENGTH_SHORT).show(); }
ActivityCompat.requestPermissions(activity,permissions,requestCode)
第二个参数是一个String数组; 第三个参数是请求码便于在onRequestPermissionsResult 方法中根据requestCode进行判断。
请求权限后会回调onRequestPermissionsResult方法,在activity中重写onRequestPermissionsResult(requestCode,permissions,grantResults)方法 ;
grantResults 是 int 类型的数组每个值为 PackageManager.PERMISSION_DENIED 分别对应permissions的每个请求
@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_READ_CONTACTS: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { } else { } } } }
ActivityCompat.shouldShowRequestPermissionRationale(activity,permission) 这个方法是在用户拒绝权限后返回true. 也就是说:用户第一次点击一个需要权限的地方,该方法返回false(因为用户没拒绝~),当用户拒绝掉该权限,下次点击此权限处,该方法会返回true.可在里面进行对该权限的说明,然后弹出权限让用户选择,并且对话框有don’t ask again选项
@OnClick(R.id.btn_check) public void onClick() { //判断是否有权限 if (ContextCompat.checkSelfPermission(PermissionActivity.this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { //当用户拒绝掉权限时. if (ActivityCompat.shouldShowRequestPermissionRationale(PermissionActivity.this, Manifest.permission.READ_CONTACTS)) { Toast.makeText(PermissionActivity.this, "true", Toast.LENGTH_SHORT).show(); AlertDialog dialog = new AlertDialog.Builder(this).setTitle("该权限保证手机不会爆炸^ ^").setPositiveButton("我需要此权限!", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ActivityCompat.requestPermissions(PermissionActivity.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS); } }).setNegativeButton("炸吧炸吧~", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(PermissionActivity.this, "准备爆炸了", Toast.LENGTH_SHORT).show(); } }).show(); } else { Toast.makeText(PermissionActivity.this, "false", Toast.LENGTH_SHORT).show(); ActivityCompat.requestPermissions(PermissionActivity.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS); } } }
ActivityCompat.shouldShowRequestPermissionRationale(activity,permission) 方法一直返回false,并且ActivityCompat.requestPermissions不会弹出对话框,系统直接deny,并回调onRequestPermissionsResult方法
@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_READ_CONTACTS: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { } else { showDialog(); // Toast.makeText(PermissionActivity.this, "request false", Toast.LENGTH_SHORT).show(); } } } } private void showDialog() { AlertDialog dialog = new AlertDialog.Builder(this).setTitle("还可以手动开启哦~").setMessage("可以前往设置->app->myapp->permission打开").setPositiveButton("确定!", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).show(); }
android权限有normal和dangerous两种 normal系统会自动给予权限,dangerous需要用户选择.Normal and Dangerous Permissions
用户手动开启权限:
转载地址:http://mtpgi.baihongyu.com/