1.前言

(1).由於MIUI等部分國產定制系統也有權限管理，沒有相關api，故無法判斷用戶是否允許獲取聯系人等隱私。在Android 6.0之後，新增權限管理可以通過官方api判斷用戶的運行狀態；

(2).我們指定targetSdkVersion為23或者之後我們還需要在運行時請求這些所需的權限。這很重要，因為已經出現了很多開發者把targetSdkVersion飙到了最新，然後發現自己的app瘋狂的崩潰，這是由於他們沒有實現執行運行時權限請求的代碼。當你已經把一個targeting API 為23或者之後的app發布到了Google Play上，這更是一個問題，你無法立即把那個apk的targeting API替換成更早的版本。

2.權限分析

從Android6.0開始，權限分為普通權限和許可權限。許可權限分類歸組，一個權限授權之後，該組下的權限均可使用。

(1)普通權限

只需要在xml申請即可，使用方法和之前6.0以前的一樣。在應用安裝應用時，會默認獲得許可。

(2)許可權限

可執行 $adb shell pm list permissions -d -g

Permission Group Permissions android.permission-group.CALENDAR

• android.permission.READ_CALENDAR
• android.permission.WRITE_CALENDAR

android.permission-group.CAMERA

• android.permission.CAMERA

android.permission-group.CONTACTS

• android.permission.READ_CONTACTS
• android.permission.WRITE_CONTACTS
• android.permission.GET_ACCOUNTS

android.permission-group.LOCATION

• android.permission.ACCESS_FINE_LOCATION
• android.permission.ACCESS_COARSE_LOCATION

android.permission-group.MICROPHONE

• android.permission.RECORD_AUDIO

android.permission-group.PHONE

• android.permission.READ_PHONE_STATE
• android.permission.CALL_PHONE
• android.permission.READ_CALL_LOG
• android.permission.WRITE_CALL_LOG
• com.android.voicemail.permission.ADD_VOICEMAIL
• android.permission.USE_SIP
• android.permission.PROCESS_OUTGOING_CALLS

android.permission-group.SENSORS

• android.permission.BODY_SENSORS

android.permission-group.SMS

• android.permission.SEND_SMS
• android.permission.RECEIVE_SMS
• android.permission.READ_SMS
• android.permission.RECEIVE_WAP_PUSH
• android.permission.RECEIVE_MMS
• android.permission.READ_CELL_BROADCASTS

android.permission-group.STORAGE

• android.permission.READ_EXTERNAL_STORAGE
• android.permission.WRITE_EXTERNAL_STORAGE

同一組的任何一個權限被授權了，其他權限也自動被授權。例如，一旦WRITE_CONTACTS被授權了，app也有READ_CONTACTS和GET_ACCOUNTS了。
源碼中被用來檢查和請求權限的方法分別是Activity的checkSelfPermission和requestPermissions，這些方法api23引入。

3.相關方法

(1).ContextCompat.checkSelfPermission()

檢查應用是否擁有該權限，被授權返回值為PERMISSION_GRANTED，否則返回PERMISSION_DENIED

(2).ActivityCompat.requestPermissions()

將彈出請求授權對話框，這個方法在M之前版本調用，OnRequestPermissionsResultCallback 直接被調用，帶著正確的 PERMISSION_GRANTED或者 PERMISSION_DENIED 。

(3).AppCompatActivity.onRequestPermissionsResult()

該方法類似於Activity的OnActivityResult()的回調方法，主要接收請求授權的返回值

//版本判斷
if (Build.VERSION.SDK_INT >= 23) {
    //減少是否擁有權限
    int checkCallPhonePermission = ContextCompat.checkSelfPermission(getApplicationContext(), permission);
    if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
        //彈出對話框接收權限
        ActivityCompat.requestPermissions(BaseActivity.this, new String[]{permission}, id);
        return;
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        //TODO:已授權
    } else {
       //TODO:用戶拒絕
    }
}

4.封裝

public class BaseActivity extends AppCompatActivity {
    private Map allowablePermissionRunnables = new HashMap<>();
    private Map disallowablePermissionRunnables = new HashMap<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    /**
     * 請求權限
     * @param id 請求授權的id 唯一標識即可
     * @param permission 請求的權限
     * @param allowableRunnable 同意授權後的操作
     * @param disallowableRunnable 禁止權限後的操作
     */
    protected void requestPermission(int id, String permission, Runnable allowableRunnable, Runnable disallowableRunnable) {
        if (allowableRunnable == null) {
            throw new IllegalArgumentException("allowableRunnable == null");
        }

        allowablePermissionRunnables.put(id, allowableRunnable);
        if (disallowableRunnable != null) {
            disallowablePermissionRunnables.put(id, disallowableRunnable);
        }

        //版本判斷
        if (Build.VERSION.SDK_INT >= 23) {
            //減少是否擁有權限
            int checkCallPhonePermission = ContextCompat.checkSelfPermission(getApplicationContext(), permission);
            if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
                //彈出對話框接收權限
                ActivityCompat.requestPermissions(BaseActivity.this, new String[]{permission}, id);
                return;
            } else {
                allowableRunnable.run();
            }
        } else {
            allowableRunnable.run();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Runnable allowRun = allowablePermissionRunnables.get(requestCode);
            allowRun.run();
        } else {
            Runnable disallowRun = disallowablePermissionRunnables.get(requestCode);
            disallowRun.run();
        }
    }
}

public class MainActivity extends BaseActivity implements View.OnClickListener{
    private Button btCallPhone;
    private Button btContact;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btCallPhone = (Button) findViewById(R.id.call_phone);
        btContact = (Button) findViewById(R.id.contact);

        btCallPhone.setOnClickListener(this);
        btContact.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v == btCallPhone){
            //撥打電話
            requestPermission(1, Manifest.permission.CALL_PHONE, new Runnable() {
                @Override
                public void run() {
                    callPhone();
                }
            }, new Runnable() {
                @Override
                public void run() {
                    callPhoneDenied();
                }
            });
        }else if(v == btContact){
            //讀取聯系人信息
            requestPermission(2, Manifest.permission.WRITE_CONTACTS, new Runnable() {
                @Override
                public void run() {
                    readContact();
                }
            }, new Runnable() {
                @Override
                public void run() {
                    readContactDenied();
                }
            });
        }
    }

    private void callPhone() {
        Toast.makeText(MainActivity.this, "CALL_PHONE OK", Toast.LENGTH_SHORT)
                .show();
    }

    private void callPhoneDenied() {
        Toast.makeText(MainActivity.this, "CALL_PHONE Denied", Toast.LENGTH_SHORT)
                .show();
    }

    private void readContact() {
        ContentResolver cr = getContentResolver();
        String str[] = {ContactsContract.CommonDataKinds.Phone.CONTACT_ID, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER,
                ContactsContract.CommonDataKinds.Phone.PHOTO_ID};
        Cursor cur = cr.query(
                ContactsContract.CommonDataKinds.Phone.CONTENT_URI, str, null,
                null, null);
        int count = cur.getCount();
        cur.close();

        Toast.makeText(MainActivity.this, String.format("發現%s條", count), Toast.LENGTH_SHORT)
                .show();
    }

    private void readContactDenied() {
        Toast.makeText(MainActivity.this, "Contact Denied", Toast.LENGTH_SHORT)
                .show();
    }
}