這段時(shí)間歹河，由于項(xiàng)目上適配android M 中的動(dòng)態(tài)權(quán)限申請(qǐng)，頻繁的寫(xiě)了一些重復(fù)的權(quán)限申請(qǐng)代碼花吟，都快想吐了秸歧，還有各種fragment中嵌套fragment的問(wèn)題，既如此何不把它封裝一下衅澈。下面直接看代碼键菱。

public class MPermission {
    private static final int PERMISSION_CODE = 0x100;
    private Object obj;
    private static Method methodOK, methodFail;
    private String[] permissions;//權(quán)限數(shù)組
    private MPermission(Object obj) {
        this.obj=obj;
        methodOK=null;
        methodFail=null;
        findMethod(obj);
    }
    private void findMethod(Object o) {
        Method[] methods = o.getClass().getDeclaredMethods();
        for (Method method : methods) {
            if (method.isAnnotationPresent(PermissionOK.class)) {
                methodOK = method;
                if(methodFail!=null){
                    break;
                }
            }else
 if(method.isAnnotationPresent(PermissionFail.class)){
                methodFail=method;
                if(methodOK!=null){
                    break;
                }
            }
        }
    }
    public static MPermission with(Object obj) {
        return new MPermission(obj);
    }
    public MPermission setPermission(String... permissions) {
        if (permissions != null && permissions.length == 0) {
            throw new RuntimeException("必須填寫(xiě)需要申請(qǐng)的權(quán)限");
        }
        this.permissions = permissions;
        return this;
    }
    public void requestPermission() {
        int index=hasPermission(permissions);
        if (index!=-1) {
            //當(dāng)檢查時(shí)發(fā)現(xiàn)系統(tǒng)不存在這個(gè)權(quán)限的時(shí)候，需要判斷當(dāng)前系統(tǒng)版本是否>=23
            if(Build.VERSION.SDK_INT>=23){
                requestPermissionApi23();
            }else{
                //此處模仿官方API中的方法 進(jìn)行回調(diào)
                //API23一下的版本直接返回失敗
                int[] grantResults = new int[permissions.length];
                for (int i = 0; i < grantResults.length; i++){
                    if(i<index){
                        grantResults[i] =PackageManager.PERMISSION_GRANTED;
                    }else {
                        grantResults[i]=PackageManager.PERMISSION_DENIED;
                    }
                }
                requestPermissionApi(grantResults);
            }
        } else {
            if(methodOK!=null) {
                try {
                    methodOK.setAccessible(true);
                    methodOK.invoke(obj, new Object[]{});
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    @TargetApi(Build.VERSION_CODES.M)
    private void requestPermissionApi23(){
        if(obj instanceof Activity){         
            ((Activity)obj).requestPermissions(permissions,PERMISSION_CODE);
        }else if(obj instanceof Fragment){
            ((Fragment)obj).requestPermissions(permissions,PERMISSION_CODE);
        }
    }
    private void requestPermissionApi(int[] grantResults){
        if(obj instanceof ActivityCompat.OnRequestPermissionsResultCallback){
            ((ActivityCompat.OnRequestPermissionsResultCallback)obj).onRequestPermissionsResult(PERMISSION_CODE,permissions,grantResults);
        }else if(obj instanceof Fragment){
            ((Fragment)obj).onRequestPermissionsResult(PERMISSION_CODE,permissions,grantResults);
        }
    }
    private int hasPermission(String[] permissions) {
        int index=-1;
        for (int i=0,j=permissions.length;i<j;i++) {
            if (ActivityCompat.checkSelfPermission(Zilla.APP.getApplicationContext(), permissions[i])
                    != PackageManager.PERMISSION_GRANTED) {
                index=i;
                break;
            }
        }
        return index;
    }
    public static void onRequestPermissionsResult(Object o,int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_CODE) {
            if (grantResults.length == permissions.length) { 
               for (int grant : grantResults) {
                    if (grant != PackageManager.PERMISSION_GRANTED) {
                        if(methodFail!=null){
                            try {
                                methodFail.invoke(o,new Object[]{});
                            } catch (IllegalAccessException e) {
                                e.printStackTrace();
                            } catch (InvocationTargetException e) {
                                e.printStackTrace();
                            }
                        }
                        return;
                    }
                }
                //權(quán)限都允許了,
                if(methodOK!=null) {
                    try {
                        methodOK.setAccessible(true);
                        methodOK.invoke(o, new Object[]{});
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    } catch (InvocationTargetException e) {
                        e.printStackTrace();
                    }
                }
            } else {
                if(methodFail!=null){
                    try {
                        methodFail.invoke(o,new Object[]{});
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    } catch (InvocationTargetException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

剩下的還有兩個(gè)是注解類(lèi)：

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface PermissionFail {}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface PermissionOK {}

以上就是所以的源碼今布，他的使用方式很簡(jiǎn)單

在Fragment個(gè)Activity中你可以這樣做

//Call it anywhere you want it to.
MPermission.with(this)
        .setPermission(Manifest.permission.READ_EXTERNAL_STORAGE
        ,Manifest.permission.WRITE_EXTERNAL_STORAGE...)
        .requestPermission();
            @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    MPermission.onRequestPermissionsResult(this,requestCode,permissions,grantResults);
}
@PermissionOK
private void valdateSuccess(){
    Log.i("權(quán)限通過(guò)");
}
@PermissionFail
public void validateFail(){
    Log.i("沒(méi)有相應(yīng)的權(quán)限");
}

如此一勞永逸纱耻，是不是很簡(jiǎn)單

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