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RxPermissions 原始碼解析
簡介
RxPermissions 是基於 RxJava 開發的用於幫助 在Android 6.0 中處理執行時許可權檢測的框架。在 Android 6.0 中增加了對危險許可權的動態申請,而不是像 Android 6.0 之前的預設全部獲取的方式。
原始動態許可權的獲取
如果按照以往的獲取許可權方式的話,那麼我們獲取許可權一般需要有 3 個步驟,第一步是先判斷當前是否已經獲取到該許可權了;第 2 步申請對應的許可權;第 3 步在 Activity 或者 Fragment 中處理獲取許可權的結果。具體的實現步驟如下:
- step 1:判斷許可權是否已經獲取。
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.CAMERA)) {
//用於開發者提示使用者許可權的用途
} else {
//申請許可權
}
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- step 2:申請許可權
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA);
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- step 3:結果處理
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
// 判斷請求碼,確定當前申請的許可權
if (requestCode == REQUEST_CAMERA) {
//判斷許可權是否申請通過
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//授權成功
} else {
//授權失敗
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
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RxPermissions 的簡單使用
其實 RxPermissions 的使用方式有兩種
- 方式 1:
RxPermissions rxPermissions = new RxPermissions(MainActivity.this);
rxPermissions
.request(Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE)//這裡填寫所需要的許可權
.subscribe(new Consumer<Boolean>() {
@Override
public void accept(Boolean aBoolean) throws Exception {
if (aBoolean) {
// 通過
}else{
// 拒絕
}
}
});
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- 方式 2:結合 RxBinding 來使用
RxPermissions rxPermissions = new RxPermissions(MainActivity.this);
// Must be done during an initialization phase like onCreate
RxView.clicks(findViewById(R.id.enableCamera))
.compose(rxPermissions.ensure(Manifest.permission.CAMERA))
.subscribe(granted -> {
// R.id.enableCamera has been clicked
});
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原始碼分析
整體介紹
接著我們來對這個 RxPermissions 進行一個原始碼的解析,但是開啟原始碼的時候,我們可以發現,這個庫裡面,其實就只有 3 個類:RxPermissions、RxPermissionsFragment、Permission
- RxPermissions
- 最主要的實現類,利用 rxjava,為我們提供了方便許可權申請的類
- RxPermissionsFragment
- 是一個 fragment,主要的動態許可權獲取類
- Permission
- 定義的許可權的 model 類
原始碼分析
RxPermissions 例項建立
對於原始碼的分析,我們應該先從簡單的使用入手。下面我們可以先看看例項化 RxPermissionsFragment 的時候是做了什麼?
RxPermissionsFragment mRxPermissionsFragment;
public RxPermissions(@NonNull Activity activity) {
mRxPermissionsFragment = getRxPermissionsFragment(activity);
}
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我們可以看到,上面的程式碼中,例項化 RxPermissionsFragment 的時候,裡面先建立了一個 RxPermissionsFragment 的例項。我們再接著看 getRxPermissionsFragment 這個方法的實現。
private RxPermissionsFragment getRxPermissionsFragment(Activity activity) {
// 查詢 RxPermissionsFragment 是否已經被新增了
RxPermissionsFragment rxPermissionsFragment = findRxPermissionsFragment(activity);
boolean isNewInstance = rxPermissionsFragment == null;
if (isNewInstance) {
rxPermissionsFragment = new RxPermissionsFragment();
FragmentManager fragmentManager = activity.getFragmentManager();
fragmentManager
.beginTransaction()
.add(rxPermissionsFragment, TAG)
.commitAllowingStateLoss();
fragmentManager.executePendingTransactions();
}
return rxPermissionsFragment;
}
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在 getRxPermissionsFragment() 這個方法中,首先是先查詢當前是否已經新增了這個 rxPermissionsFragment 的例項,如果已經新增,那麼直接返回已經新增的例項,如果沒有新增過的話,那麼就重新再建立一個 RxPermissionsFragment 例項並提交;
private RxPermissionsFragment findRxPermissionsFragment(Activity activity) {
return (RxPermissionsFragment) activity.getFragmentManager().findFragmentByTag(TAG);
}
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到此,rxPermissionsFragment 的例項化已經完成,接著我們需要看看 request 這個方法中實現了什麼。
request 方法
public Observable<Boolean> request(final String... permissions) {
return Observable.just(TRIGGER).compose(ensure(permissions));
}
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static final Object TRIGGER = new Object();
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從上面的程式碼中,我們可以看到,request 方法中需要傳入的引數是一個 許可權的陣列,返回值是 Observable 物件。Observable.just(TRIGGER) 是快捷建立一個 Observable 的方式,由於 TRIGGER 是一個空的 Object 物件,所以 TRIGGER 就是一個佔位符而已,Observable.just(TRIGGER) 建立的是一個 Observable,之後通過 compose 將 Observable 轉化為 Observable 並返回。在 compose 中需要的引數是一個 ObservableTransformer,那麼我們接著看 ensure() 這個方法。
ensure(permissions);
public <T> ObservableTransformer<T, Boolean> ensure(final String... permissions) {
// 建立一個Transformer物件返回
return new ObservableTransformer<T, Boolean>() {
@Override
public ObservableSource<Boolean> apply(Observable<T> o) {
//request(o, permissions) 方法返回 Observable<Permission> 物件
return request(o, permissions)
// 將 Observable<Permission> 轉換為 Observable<Boolean>,在這裡會等待所有的許可權都返回了一次性發射資料。
.buffer(permissions.length)
.flatMap(new Function<List<Permission>, ObservableSource<Boolean>>() {
@Override
public ObservableSource<Boolean> apply(List<Permission> permissions) throws Exception {
// 如果permissions為空那麼直接返回Observable.empty();
if (permissions.isEmpty()) {
// Occurs during orientation change, when the subject receives onComplete.
// In that case we don`t want to propagate that empty list to the
// subscriber, only the onComplete.
return Observable.empty();
}
// Return true if all permissions are granted.
for (Permission p : permissions) {
if (!p.granted) {
return Observable.just(false);
}
}
return Observable.just(true);
}
});
}
};
}
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在 ensure 的這個方法中,最終會返回的是 ObservableTransformer<T, Boolean> 物件。接著我們看看 ObservableTransformer 的匿名實現類裡面的 apply 方法,這裡實現的就是將 Observable 轉換為 Observable 的操作。我們對 apply 這個方法裡面的程式碼進行簡化一下。
return request(o,permissions)
.buffer(permissions.length)
.flatMap(new Function<List<Permission>, ObservableSource<Boolean>>{});
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- request() 方法返回 Observable 物件
- buffer(len) 操作符將一個 Observable 變換為 Observable<List>,原來的 Observable 正常發射資料,變換產生的 Observable 發射這些資料的快取集合。buffer 將資料快取到一個集合當中,然後在適當(比如:所有請求的許可權結果都返回了)的時機一起傳送。
- flatMap() 方法將 Observable<List> 轉化為 Observable
request(o, permissions);
private Observable<Permission> request(final Observable<?> trigger, final String... permissions) {
if (permissions == null || permissions.length == 0) {
throw new IllegalArgumentException("RxPermissions.request/requestEach requires at least one input permission");
}
return oneOf(trigger, pending(permissions))
.flatMap(new Function<Object, Observable<Permission>>() {
@Override
public Observable<Permission> apply(Object o) throws Exception {
return requestImplementation(permissions);
}
});
}
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在 request 這個方法裡面,其實 oneOf() 和 pending() 方法我們可以忽略的,主要的話,我們應該關注 requestImplementation(final String… permissions) 這個方法,在這個方法裡面,主要實現了許可權的請求。
requestImplementation
@TargetApi(Build.VERSION_CODES.M)
private Observable<Permission> requestImplementation(final String... permissions) {
List<Observable<Permission>> list = new ArrayList<>(permissions.length);
List<String> unrequestedPermissions = new ArrayList<>();
// In case of multiple permissions, we create an Observable for each of them.
// At the end, the observables are combined to have a unique response.
for (String permission : permissions) {
mRxPermissionsFragment.log("Requesting permission " + permission);
if (isGranted(permission)) {
// Already granted, or not Android M
// Return a granted Permission object.
// 許可權已經被同意或者不是 Android 6.0 以上版本,建立一個 同意的 Permission 物件。
list.add(Observable.just(new Permission(permission, true, false)));
continue;
}
if (isRevoked(permission)) {
// 許可權被拒絕,返回一個 拒絕的 Permission 物件。
list.add(Observable.just(new Permission(permission, false, false)));
continue;
}
PublishSubject<Permission> subject = mRxPermissionsFragment.getSubjectByPermission(permission);
// 如果 subject 不存在,那麼建立一個 subject。
if (subject == null) {
unrequestedPermissions.add(permission);
subject = PublishSubject.create();
mRxPermissionsFragment.setSubjectForPermission(permission, subject);
}
list.add(subject);
}
// 還未提起申請的許可權進行申請
if (!unrequestedPermissions.isEmpty()) {
String[] unrequestedPermissionsArray = unrequestedPermissions.toArray(new String[unrequestedPermissions.size()]);
requestPermissionsFromFragment(unrequestedPermissionsArray);
}
// 嚴格按照順序發射資料
return Observable.concat(Observable.fromIterable(list));
}
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onRequestPermissionsResult()
@TargetApi(Build.VERSION_CODES.M)
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode != PERMISSIONS_REQUEST_CODE) return;
boolean[] shouldShowRequestPermissionRationale = new boolean[permissions.length];
for (int i = 0; i < permissions.length; i++) {
shouldShowRequestPermissionRationale[i] = shouldShowRequestPermissionRationale(permissions[i]);
}
onRequestPermissionsResult(permissions, grantResults, shouldShowRequestPermissionRationale);
}
void onRequestPermissionsResult(String permissions[], int[] grantResults, boolean[] shouldShowRequestPermissionRationale) {
for (int i = 0, size = permissions.length; i < size; i++) {
log("onRequestPermissionsResult " + permissions[i]);
// Find the corresponding subject
PublishSubject<Permission> subject = mSubjects.get(permissions[i]);
if (subject == null) {
// No subject found
Log.e(RxPermissions.TAG, "RxPermissions.onRequestPermissionsResult invoked but didn`t find the corresponding permission request.");
return;
}
// 發射許可權申請結果
mSubjects.remove(permissions[i]);
boolean granted = grantResults[i] == PackageManager.PERMISSION_GRANTED;
subject.onNext(new Permission(permissions[i], granted, shouldShowRequestPermissionRationale[i]));
subject.onComplete();
}
}
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RxJava 操作符
Observable.just()
just 操作符是將一個物件轉化為 Observable 的操作符。這個物件可以是一個數字、字串或者是陣列物件等,是 RxJava 中快速建立一個 Observable 物件的操作符。如果有 subscriber 訂閱的話,那麼會依次呼叫 onNext() 和 OnComplete() 方法。所以這裡只是建立了一個 Observable 物件,方便後續的呼叫。
compose(Transformer)操作符
compose 操作符是對 Observable 物件的整體轉化。例如:通過 Transformer,我們可以將 Observable 物件轉換成 Observable 物件了。
public static ObservableTransformer<String,Boolean> getTransformer(){
return new ObservableTransformer<String, Boolean>() {
@Override
public ObservableSource<Boolean> apply(Observable<String> upstream) {
return upstream.flatMap(new Function<String, ObservableSource<Boolean>>() {
@Override
public ObservableSource<Boolean> apply(String s) throws Exception {
return Observable.just(true);
}
});
}
};
}
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/**
* 執行緒切換
* @return
*/
public static <T> ObservableTransformer<T,T> getScheduler(){
return new ObservableTransformer<T, T>() {
@Override
public ObservableSource<T> apply(Observable<T> upstream) {
return upstream.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());
}
};
}
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buffer 操作符
buffer 操作符將一個 Observable 變換為另一個,原來的 Observable 正常發射資料,變換產生的 Observable 發射這些資料的快取集合。buffer將資料快取到一個集合當中,然後在適當的時機一起傳送。
buffer(count) 以列表(List)的形式發射非重疊的快取,每一個快取至多包含來自原始Observable的count項資料(最後發射的列表資料可能少於count項)
- 例如:快取 2 個資料之後,再傳送資料(呼叫 buffer(count) 函式)
Observable.just(1,2,3,4,5,6)
.buffer(2)
.subscribe(integers -> {
Log.i(TAG, "accept size: "+integers.size());
for (Integer integer : integers) {
Log.i(TAG, "accept: "+integer);
}
});
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- 輸出結果
2018-12-14 11:16:28.452 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept size: 2
2018-12-14 11:16:28.452 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 1
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 2
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept size: 2
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 3
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 4
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept size: 2
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 5
2018-12-14 11:16:28.453 28126-28126/com.luwei.lwbaselib I/LwBaseActivity: accept: 6
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- 例如:快取 3 個資料,再傳送資料,每次移動 1 步
Observable.just(1,2,3,4)
.buffer(3,1)
.subscribe(integers -> {
Log.i(TAG, "accept size: "+integers.size());
for (Integer integer : integers) {
Log.i(TAG, "accept: "+integer);
}
});
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- 輸出結果
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept size: 3
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 1
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 2
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 3
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept size: 3
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 2
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 3
2018-12-14 11:24:31.455 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 4
2018-12-14 11:24:31.456 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept size: 2
2018-12-14 11:24:31.456 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 3
2018-12-14 11:24:31.456 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 4
2018-12-14 11:24:31.456 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept size: 1
2018-12-14 11:24:31.456 29164-29164/com.luwei.lwbaselib I/LwBaseActivity: accept: 4
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concat 操作符
是接收若干個Observables,發射資料是有序的,不會交叉。
Subject
- 作為 Observable 和 Observer 之間的橋樑
- 可以當做 Observable
- 可以當做 Observer
PublishSubject
繼承至 Subject,它的 Observer 只會接收到 PublishSubject 被訂閱之後傳送的資料。示例程式碼如下;我們只會接收到 publishSubject3 和 publishSubject4;
PublishSubject<String> publishSubject = PublishSubject.create();
publishSubject.onNext("publishSubject1");
publishSubject.onNext("publishSubject2");
publishSubject.subscribe(new Consumer<String>() {
@Override
public void accept(String s) throws Exception {
Log.i(TAG, "accept: "+s);
}
});
publishSubject.onNext("publishSubject3");
publishSubject.onNext("publishSubject4");
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- 執行結果
2018-12-14 11:33:18.168 29916-29916/com.luwei.lwbaselib I/LwBaseActivity: accept: publishSubject3
2018-12-14 11:33:18.168 29916-29916/com.luwei.lwbaselib I/LwBaseActivity: accept: publishSubject4
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舉一反三
可以看到,在 RxPermissions 這個獲取許可權的開源框架中,往 Activity 中新增了一個空的 Fragment,這個 fragment 才是用來發起申請許可權和處理許可權的請求,最後再將結果返回,這樣子就避免了我們傳送請求之後,還需要在 onRequestPermissionsResult 中進行處理,並判斷 requestCode 等繁瑣操作。想到這裡,我們平時使用 startActivityForResult 時,我們也可以同樣採用這樣的思路來簡化我們的請求。
同樣的,我們採用新增空白的 fragment,來做 startActivityForResult 請求,主要的實現類有 SimpleForResult 和 SimpleOnResultFragment,ActivityResultInfo 是請求 model,接下我們先看程式碼。
SimpleForResult
/**
* @Author: chenjianrun
* @Time: 2018/12/7
* @Description: 避免呼叫 startActivity 時,需要 onActivityResult 處理的類
*/
public class SimpleForResult {
private static final String TAG = "SimpleForResult";
private SimpleOnResultFragment mSimpleOnResultFragment;
public SimpleForResult(AppCompatActivity activity) {
mSimpleOnResultFragment = getOnResultFragment(activity.getSupportFragmentManager());
}
public SimpleForResult(Fragment fragment){
mSimpleOnResultFragment = getOnResultFragment(fragment.getChildFragmentManager());
}
private SimpleOnResultFragment getOnResultFragment(FragmentManager fragmentManager) {
SimpleOnResultFragment simpleOnResultFragment = findSimpleOnResultFragment(fragmentManager);
if (simpleOnResultFragment == null) {
simpleOnResultFragment = new SimpleOnResultFragment();
fragmentManager
.beginTransaction()
.add(simpleOnResultFragment, TAG)
.commitAllowingStateLoss();
fragmentManager.executePendingTransactions();
}
return simpleOnResultFragment;
}
private SimpleOnResultFragment findSimpleOnResultFragment(FragmentManager fragmentManager) {
return (SimpleOnResultFragment) fragmentManager.findFragmentByTag(TAG);
}
public Observable<ActivityResultInfo> startForResult(Intent intent) {
return mSimpleOnResultFragment.startForResult(intent);
}
public Observable<ActivityResultInfo> startForResult(Class<?> clazz) {
Intent intent = new Intent(mSimpleOnResultFragment.getActivity(), clazz);
return startForResult(intent);
}
public void startForResult(Intent intent, Callback callback) {
mSimpleOnResultFragment.startForResult(intent, callback);
}
public void startForResult(Class<?> clazz, Callback callback) {
Intent intent = new Intent(mSimpleOnResultFragment.getActivity(), clazz);
startForResult(intent, callback);
}
public interface Callback {
void onActivityResult(int requestCode, int resultCode, Intent data);
}
}
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SimpleOnResultFragment
/**
* @Author: chenjianrun
* @Time: 2018/12/7
* @Description: 真正呼叫 startActivity 和處理 onActivityResult 的類。
*/
public class SimpleOnResultFragment extends Fragment {
private static Map<Integer, PublishSubject<ActivityResultInfo>> mSubjects = new HashMap<>();
private static Map<Integer, SimpleForResult.Callback> mCallbacks = new HashMap<>();
public SimpleOnResultFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
public Observable<ActivityResultInfo> startForResult(final Intent intent) {
int requestCode = generateRequestCode();
PublishSubject<ActivityResultInfo> subject = PublishSubject.create();
mSubjects.put(requestCode, subject);
startActivityForResult(intent, requestCode);
return subject;
}
public void startForResult(Intent intent, SimpleForResult.Callback callback) {
int requestCode = generateRequestCode();
mCallbacks.put(requestCode, callback);
startActivityForResult(intent, requestCode);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//rxjava方式的處理
PublishSubject<ActivityResultInfo> subject = mSubjects.remove(requestCode);
if (subject != null) {
subject.onNext(new ActivityResultInfo(requestCode, resultCode, data));
subject.onComplete();
}
//callback方式的處理
SimpleForResult.Callback callback = mCallbacks.remove(requestCode);
if (callback != null) {
callback.onActivityResult(requestCode, resultCode, data);
}
}
private int generateRequestCode(){
Random random = new Random();
for (;;){
int code = random.nextInt(65536);
if (!mSubjects.containsKey(code) && !mCallbacks.containsKey(code)){
return code;
}
}
}
}
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ActivityResultInfo
package com.luwei.util.forresult;
import android.content.Intent;
/**
* @Author: chenjianrun
* @Time: 2018/12/7
* @Description:
*/
public class ActivityResultInfo {
private int requestCode;
private int resultCode;
private Intent data;
public ActivityResultInfo(int requestCode, int resultCode, Intent data) {
this.requestCode = requestCode;
this.resultCode = resultCode;
this.data = data;
}
public int getRequestCode() {
return requestCode;
}
public void setRequestCode(int requestCode) {
this.requestCode = requestCode;
}
public ActivityResultInfo(int resultCode, Intent data) {
this.resultCode = resultCode;
this.data = data;
}
public int getResultCode() {
return resultCode;
}
public void setResultCode(int resultCode) {
this.resultCode = resultCode;
}
public Intent getData() {
return data;
}
public void setData(Intent data) {
this.data = data;
}
}
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簡單使用示例
- 簡單的 Activity 呼叫
// 簡化呼叫 startActivityForResult 及避免在 onActivityResult 中處理繁瑣的結果
SimpleForResult simpleForResult = new SimpleForResult(this);
simpleForResult.startForResult(ToastActivity.class)
.subscribe((resultInfo) -> {
if (resultInfo.getData() != null) {
ToastUtils.showLong(resultInfo.getData().getStringExtra("result"));
}
});
複製程式碼
- 呼叫攝像頭
/**
* 開啟攝像頭
*/
private void openCamera() {
try {
mTmpFile = FileUtils.createTmpFile(this);
} catch (IOException e) {
e.printStackTrace();
}
simpleForResult.startForResult(getOpenCameraIntent(this, mTmpFile))
.subscribe((resultInfo -> {
if (resultInfo.getResultCode() == RESULT_OK) {
mHeadUrl = mTmpFile.getAbsolutePath();
ImageLoaderUtils.loadCircleImage(this, ivHeader, mHeadUrl);
// 裁剪(如果沒有要求可裁剪,也可以不要)
startPictureZoom(mTmpFile);
}
}));
}
/**
* 獲取開啟照相機的 intent,適配 Android 7.0
* @param activity
* @param mTmpFile
* @return
*/
public static Intent getOpenCameraIntent(Activity activity,File mTmpFile){
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intent.resolveActivity(activity.getPackageManager()) != null) {
if (mTmpFile != null && mTmpFile.exists()) {
if (Build.VERSION.SDK_INT >= 24) {
// 適配 Android 7.0
intent.putExtra(MediaStore.EXTRA_OUTPUT,
FileProvider.getUriForFile(activity, activity.getPackageName()+".provider",mTmpFile));
} else {
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mTmpFile));
}
} else {
Toast.makeText(activity, me.nereo.image_selector.R.string.error_image_not_exist, Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(activity, me.nereo.image_selector.R.string.msg_no_camera, Toast.LENGTH_SHORT).show();
}
return intent;
}
複製程式碼