package com.example.myapp.activity;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.myapp.R;

import java.io.FileNotFoundException;
import java.io.IOException;

public class TakePhotoActivity extends AppCompatActivity {
    private Button btn_photo;
    private TextView tv;
    private ImageView img;
    private Toolbar toolbar;
    Intent intent = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_take_photo);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        btn_photo = findViewById(R.id.btn_photo);
        img = findViewById(R.id.img);

        /**
         * 解决android7调用照相机后直接奔溃问题
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
            StrictMode.setVmPolicy(builder.build());
            builder.detectFileUriExposure();
        }
        checkPermission();
        initListener();
    }

    /**
     * 检查拍照权限,防止权限拒绝
     */
    private void checkPermission() {
        if (ContextCompat.checkSelfPermission(TakePhotoActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            // 执行到这里表示没有访问权限
            if (ActivityCompat.shouldShowRequestPermissionRationale(TakePhotoActivity.this, Manifest.permission.CAMERA)) {
                Toast.makeText(TakePhotoActivity.this,"禁止访问",Toast.LENGTH_LONG).show();
            } else {
                ActivityCompat.requestPermissions(TakePhotoActivity.this, new String[]{Manifest.permission.CAMERA}, 200);
            }
        } else {
            takePhoto();
        }
    }

    private void initListener() {
        // 顶部返回
        toolbar.setNavigationIcon(R.mipmap.top_bar_left_back);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });
        // 按钮点击事件,单击弹出AlertDialog对话框
        btn_photo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new AlertDialog.Builder(TakePhotoActivity.this)
                        .setIcon(R.mipmap.picture)
                        .setMessage("插入图片")
                        .setPositiveButton("拍照", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                takePhoto();
                            }
                        }).setNegativeButton("相册", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        chooseFromAlbum();
                    }
                }).create().show();
            }
        });
    }

    /**
     * 获取图片
     */
    public void takePhoto() {
        intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // 调用系统相机
        intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, 200);   //有数据的返回
    }

    /**
     * 选择相册
     */
    public void chooseFromAlbum() {
        intent = new Intent();
        intent.