Android之6.0 权限申请封装
【摘要】 之前一篇博客初试了Android6.0系统的动态权限申请,成功之后开始思考将权限申请功能封装以供更加方便的调用。
查阅6.0系统权限相关的API,整个权限申请需要调用三个方法:
1. ContextCompat.checkSelfPermission()
检查应用是否拥有该权限,被授权返回值为PERMISSION_GRANTED,否则返回PERM...
之前一篇博客初试了Android6.0系统的动态权限申请,成功之后开始思考将权限申请功能封装以供更加方便的调用。
查阅6.0系统权限相关的API,整个权限申请需要调用三个方法:
1. ContextCompat.checkSelfPermission()
检查应用是否拥有该权限,被授权返回值为PERMISSION_GRANTED,否则返回PERMISSION_DENIED
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/**
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* Determine whether <em>you</em> have been granted a particular permission.
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*
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* @param permission The name of the permission being checked.
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*
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* @return {@link android.content.pm.PackageManager#PERMISSION_GRANTED} if you have the
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* permission, or {@link android.content.pm.PackageManager#PERMISSION_DENIED} if not.
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*
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* @see android.content.pm.PackageManager#checkPermission(String, String)
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*/
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public static int checkSelfPermission(@NonNull Context context, @NonNull String permission) {
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if (permission == null) {
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throw new IllegalArgumentException("permission is null");
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}
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return context.checkPermission(permission, android.os.Process.myPid(), Process.myUid());
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}
2、ActivityCompat.requestPermissions()
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/**
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* Requests permissions to be granted to this application. These permissions
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* must be requested in your manifest, they should not be granted to your app,
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* and they should have protection level {@link android.content.pm.PermissionInfo
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* #PROTECTION_DANGEROUS dangerous}, regardless whether they are declared by
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* the platform or a third-party app.
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* <p>
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* Normal permissions {@link android.content.pm.PermissionInfo#PROTECTION_NORMAL}
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* are granted at install time if requested in the manifest. Signature permissions
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* {@link android.content.pm.PermissionInfo#PROTECTION_SIGNATURE} are granted at
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* install time if requested in the manifest and the signature of your app matches
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* the signature of the app declaring the permissions.
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* </p>
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* <p>
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* If your app does not have the requested permissions the user will be presented
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* with UI for accepting them. After the user has accepted or rejected the
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* requested permissions you will receive a callback reporting whether the
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* permissions were granted or not. Your activity has to implement {@link
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* android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback}
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* and the results of permission requests will be delivered to its {@link
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* android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback#onRequestPermissionsResult(
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* int, String[], int[])} method.
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* </p>
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* <p>
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* Note that requesting a permission does not guarantee it will be granted and
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* your app should be able to run without having this permission.
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* </p>
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* <p>
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* This method may start an activity allowing the user to choose which permissions
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* to grant and which to reject. Hence, you should be prepared that your activity
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* may be paused and resumed. Further, granting some permissions may require
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* a restart of you application. In such a case, the system will recreate the
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* activity stack before delivering the result to your onRequestPermissionsResult(
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* int, String[], int[]).
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* </p>
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* <p>
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* When checking whether you have a permission you should use {@link
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* #checkSelfPermission(android.content.Context, String)}.
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* </p>
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*
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* @param activity The target activity.
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* @param permissions The requested permissions.
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* @param requestCode Application specific request code to match with a result
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* reported to {@link OnRequestPermissionsResultCallback#onRequestPermissionsResult(
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* int, String[], int[])}.
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*
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* @see #checkSelfPermission(android.content.Context, String)
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* @see #shouldShowRequestPermissionRationale(android.app.Activity, String)
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*/
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public static void requestPermissions(final @NonNull Activity activity,
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final @NonNull String[] permissions, final int requestCode) {
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if (Build.VERSION.SDK_INT >= 23) {
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ActivityCompatApi23.requestPermissions(activity, permissions, requestCode);
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} else if (activity instanceof OnRequestPermissionsResultCallback) {
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Handler handler = new Handler(Looper.getMainLooper());
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handler.post(new Runnable() {
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@Override
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public void run() {
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final int[] grantResults = new int[permissions.length];
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PackageManager packageManager = activity.getPackageManager();
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String packageName = activity.getPackageName();
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final int permissionCount = permissions.length;
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for (int i = 0; i < permissionCount; i++) {
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grantResults[i] = packageManager.checkPermission(
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permissions[i], packageName);
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}
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((OnRequestPermissionsResultCallback) activity).onRequestPermissionsResult(
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requestCode, permissions, grantResults);
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}
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});
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}
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}
3、AppCompatActivity.onRequestPermissionsResult()
该方法类似于Activity的OnActivityResult()的回调方法,主要接收请求授权的返回值
下面开始在项目中进行权限封装:
1、新建一个BaseActivity活动,extends自AppCompatActivity。这里将权限申请设计成基类,让项目中的所有活动都继承BaseActivity类。
延伸学习:关于extends和implements的区别参考
2、声明两个Map类型的变量,用于存放取得权限后的运行和未获取权限时的运行。
延伸学习:java中Map,List与Set的区别
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private Map<Integer, Runnable> allowablePermissionRunnables = new HashMap<>();
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private Map<Integer, Runnable> disallowblePermissionRunnables = new HashMap<>();
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3、实现requesPermission方法。
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* @param requestId 请求授权的Id,唯一即可
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* @param permission 请求的授权
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* @param allowableRunnable 同意授权后的操作
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* @param disallowableRunnable 禁止授权后的操作
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**/
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protected void requestPermission(int requestId, String permission,
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Runnable allowableRunnable, Runnable disallowableRunnable) {
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if (allowableRunnable == null) {
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throw new IllegalArgumentException("allowableRunnable == null");
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}
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allowablePermissionRunnables.put(requestId, allowableRunnable);
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if (disallowableRunnable != null) {
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disallowblePermissionRunnables.put(requestId, disallowableRunnable);
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}
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//版本判断
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if (Build.VERSION.SDK_INT >= 23) {
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//检查是否拥有权限
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int checkPermission = ContextCompat.checkSelfPermission(MyApplication.getContext(), permission);
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if (checkPermission != PackageManager.PERMISSION_GRANTED) {
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//弹出对话框请求授权
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ActivityCompat.requestPermissions(BaseActivity.this, new String[]{permission}, requestId);
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return;
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} else {
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allowableRunnable.run();
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}
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} else {
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allowableRunnable.run();
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}
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}
4、实现onRequestPermissionsResult方法。
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@Override
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public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults);
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if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
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Runnable allowRun=allowablePermissionRunnables.get(requestCode);
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allowRun.run();
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}else {
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Runnable disallowRun = disallowblePermissionRunnables.get(requestCode);
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disallowRun.run();
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}
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}
5、调用
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public static final String CONTACT_PERMISSION = android.Manifest.permission.READ_CONTACTS;
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public static final int readContactRequest = 1;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.content_get_contacts);
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ContactsLv = (ListView) findViewById(R.id.ContactsLv);
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adapter = new ContactsAdapter(list, this);
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ContactsLv.setAdapter(adapter);
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requestPermission(readContactRequest, CONTACT_PERMISSION, new Runnable() {
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@Override
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public void run() {
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getContacts();
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}
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}, new Runnable() {
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@Override
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public void run() {
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getContactsDenied();
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}
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});
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}
文章来源: chenyu.blog.csdn.net,作者:chen.yu,版权归原作者所有,如需转载,请联系作者。
原文链接:chenyu.blog.csdn.net/article/details/52040926
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