EasyPermissions的使用方法

从 Android 6.0（API 级别 23）开始，用户开始在应用运行时向其授予权限，而不是在应用安装时授予。

系统权限分为两类：正常权限和危险权限：
- 正常权限不会直接给用户隐私权带来风险。如果您的应用在其清单中列出了正常权限，系统将自动授予该权限。
- 危险权限会授予应用访问用户机密数据的权限。如果您的应用在其清单中列出了正常权限，系统将自动授予该权限。如果您列出了危险权限，则用户必须明确批准您的应用使用这些权限。

1.Google原始的请求权限的方法

   //正常获取权限
    private void checkPermissionForNormal() {
        //判断是否同意此权限
        if ((this,
                .CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {           
                //申请权限
                (this, new String[]{.CALL_PHONE}, 100);
            }
        } else {
            (this, "已授权 CALL_PHONE", Toast.LENGTH_LONG).show();
        }
    }

权限的回调

 @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case 100: {
                //返回的结果数组大于0说明有结果
                if ( > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    (this, "同意了权限", Toast.LENGTH_SHORT).show();
                    callPhone();
                } else {
                    (this, "拒绝了权限", Toast.LENGTH_SHORT).show();
                }
                return;
            }
        }
    }

2.封装的三方库——EasyPermissions
这个用于权限的申请，使用起来十分的简单

• 引入库

compile ':easypermissions:0.1.5'  

• 代码块

package .easypermissions_demo;

import ;
import ;
import .;
import ;
import ;
import ;
import ;
import ;
import ;

public class MainActivity extends AppCompatActivity implements View.OnClickListener,EasyPermissions.PermissionCallbacks {

    private static final String TAG = "MainActivity";

    private static final int CAMERA_REQUESTCODE = 101;
    private static final int LOCATION_CONTACTS_REQUESTCODE = 102;

    private Button button_camera;
    private Button button_location_and_contacts;

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

        button_camera = (Button) findViewById(.button_camera);
        button_location_and_contacts = (Button) findViewById(.button_location_and_contacts);
        button_camera.setOnClickListener(this);
        button_location_and_contacts.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (()) {
            case .button_camera:
                requestCamera();
                break;
            case .button_location_and_contacts:
                requestLocationAndContacts();
                break;
        }
    }

    public void requestCamera() {
        if ((this, )) {
            (this, "已授权 Camera", Toast.LENGTH_LONG).show();
        } else {
            // request for one permission
            (this, getString(.rationale_camera),
                    CAMERA_REQUESTCODE, );
        }
    }

    public void requestLocationAndContacts() {
        String[] perms = { .ACCESS_FINE_LOCATION, .READ_CONTACTS };
        if ((this, perms)) {
            (this, "已授权 联系人和 位置信息", Toast.LENGTH_LONG).show();
        } else {
            // request for both permissions
            (this, getString(.rationale_location_contacts),
                    LOCATION_CONTACTS_REQUESTCODE, perms);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        // EasyPermissions 权限处理请求结果
        (TAG,"onRequestPermissionsResult:"+ requestCode);
        (requestCode, permissions, grantResults, this);
    }

    //同意授权
    @Override
    public void onPermissionsGranted(int requestCode, List<String> perms) {
        (TAG, "onPermissionsGranted:" + requestCode + ":" + ());
    }

    //拒绝授权
    @Override
    public void onPermissionsDenied(int requestCode, List<String> perms) {
        (TAG, "onPermissionsDenied:" + requestCode + ":" + ());
    }
}