调用相机申请权限

 https://blog.csdn.net/Android_xue/article/details/78854885 相机申请权限

package com.example.administrator.downrainsun;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Application;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.content.ContextCompat;



public class BaseFragment extends Fragment {


    private final int mRequestCode = 1024;
    private RequestPermissionCallBack mRequestPermissionCallBack;

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

    /**
     * 权限请求结果回调
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        boolean hasAllGranted = true;
        StringBuilder permissionName = new StringBuilder();
        for (String s : permissions) {
            permissionName = permissionName.append(s + "
");
        }
        switch (requestCode) {
            case mRequestCode: {
                for (int i = 0; i < grantResults.length; ++i) {
                    if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
                        hasAllGranted = false;
                        //在用户已经拒绝授权的情况下，如果shouldShowRequestPermissionRationale返回false则
                        // 可以推断出用户选择了“不在提示”选项，在这种情况下需要引导用户至设置页手动授权
                        if (!ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), permissions[i])) {
                            new AlertDialog.Builder(getActivity()).setTitle("PermissionTest")//设置对话框标题
                                    .setMessage("【用户选择了不再提示按钮，或者系统默认不在提示（如MIUI）。" +
                                            "引导用户到应用设置页去手动授权,注意提示用户具体需要哪些权限】" +
                                            "获取相关权限失败:" + permissionName +
                                            "将导致部分功能无法正常使用，需要到设置页面手动授权")//设置显示的内容
                                    .setPositiveButton("去授权", new DialogInterface.OnClickListener() {//添加确定按钮
                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {//确定按钮的响应事件
                                            //TODO Auto-generated method stub
                                            Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                            Uri uri = Uri.fromParts("package", com.example.administrator.downrainsun.Application.getContext().getPackageName(), null);
                                            intent.setData(uri);
                                            startActivity(intent);
                                            dialog.dismiss();
                                        }
                                    }).setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加返回按钮
                                @Override
                                public void onClick(DialogInterface dialog, int which) {//响应事件
                                    // TODO Auto-generated method stub
                                    dialog.dismiss();
                                }
                            }).setOnCancelListener(new DialogInterface.OnCancelListener() {
                                @Override
                                public void onCancel(DialogInterface dialog) {
                                    mRequestPermissionCallBack.denied();
                                }
                            }).show();//在按键响应事件中显示此对话框
                        } else {
                            //用户拒绝权限请求，但未选中“不再提示”选项
                            mRequestPermissionCallBack.denied();
                        }
                        break;
                    }
                }
                if (hasAllGranted) {
                    mRequestPermissionCallBack.granted();
                }
            }
        }
    }

    /**
     * 发起权限请求
     *
     * @param context
     * @param permissions
     * @param callback
     */
    public void requestPermissions(final Context context, final String[] permissions,
                                   RequestPermissionCallBack callback) {
        this.mRequestPermissionCallBack = callback;
        StringBuilder permissionNames = new StringBuilder();
        for (String s : permissions) {
            permissionNames = permissionNames.append(s + "
");
        }
        //如果所有权限都已授权，则直接返回授权成功,只要有一项未授权，则发起权限请求
        boolean isAllGranted = true;
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_DENIED) {
                isAllGranted = false;
                if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, permission)) {
                    new AlertDialog.Builder(getActivity()).setTitle("PermissionTest")//设置对话框标题
                            .setMessage("【用户曾经拒绝过你的请求，所以这次发起请求时解释一下】" +
                                    "您好，需要如下权限：" + permissionNames +
                                    " 请允许，否则将影响部分功能的正常使用。")//设置显示的内容
                            .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加确定按钮
                                @Override
                                public void onClick(DialogInterface dialog, int which) {//确定按钮的响应事件
                                    //TODO Auto-generated method stub
                                    ActivityCompat.requestPermissions(((Activity) context), permissions, mRequestCode);
                                }
                            }).show();//在按键响应事件中显示此对话框
                } else {
                    ActivityCompat.requestPermissions(((Activity) context), permissions, mRequestCode);
                }
                break;
            }
        }
        if (isAllGranted) {
            mRequestPermissionCallBack.granted();
            return;
        }
    }

    /**
     * 权限请求结果回调接口
     */
    interface RequestPermissionCallBack {
        /**
         * 同意授权
         */
        void granted();

        /**
         * 取消授权
         */
        void denied();
    }
}

circleImageview的手动实现（）

package com.example.administrator.downrainsun;


import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

@SuppressLint("AppCompatCustomView")
public class CircleImageView extends ImageView {
    private Paint mPaint = new Paint();

    public CircleImageView(Context context) {
        super(context);
    }

    public CircleImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CircleImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    private Bitmap scaleBitmap(Bitmap bitmap) {
        float scale = (float) getWidth() / bitmap.getWidth();
        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);
        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Drawable drawable = getDrawable();
        if (drawable != null) {
            Bitmap rawBitmap = ((BitmapDrawable) drawable).getBitmap();

            Bitmap newBitmap = scaleBitmap(rawBitmap);
            Bitmap circleBitmap = getCircleBitmap(newBitmap);

            mPaint.reset();
            canvas.drawBitmap(circleBitmap, 0, 0, mPaint);
        }
    }

    private Bitmap getCircleBitmap(Bitmap bitmap) {

        Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_4444);
        Canvas canvas = new Canvas(circleBitmap);

        mPaint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        int radius = bitmap.getWidth() / 2;
        canvas.drawCircle(radius, radius, radius, mPaint);
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, 0, 0, mPaint);
        return circleBitmap;
    }
}

 https://blog.csdn.net/harvic880925/article/details/49272285  pupopwindow

https://blog.csdn.net/smile_Running/article/details/97113256  design 库