团队博客

拍照与相册上传。

权限添加：

<!--拍照-->
<uses-permission android:name="android.permission.CAMERA" />
<!--读写-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.PERMISSIONS_STORAGE"/>

配置清单文件：

<provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.mooc.uploadfile4.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true"
            tools:ignore="MissingClass">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
</provider>

函数：

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.FileProvider;

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

public class MainActivity extends AppCompatActivity {

    private Button cameraBt;
    private Button photoBt;
    private ImageView camereIv;
    private ImageView photoIv;
    private String TAG = "tag";
    //需要的权限数组 读/写/相机
    private static String[] PERMISSIONS_STORAGE = {Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.CAMERA};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //跳转相机动态权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
            StrictMode.setVmPolicy(builder.build());
        }
        initView();
    }


    private Uri ImageUri;
    public static final int TAKE_PHOTO = 101;
    public static final int TAKE_CAMARA = 100;

    private void initView() {
        cameraBt = (Button) findViewById(R.id.camera_bt);
        photoBt = (Button) findViewById(R.id.photo_bt);
        camereIv = (ImageView) findViewById(R.id.camere_iv);
        photoIv = (ImageView) findViewById(R.id.photo_iv);

        cameraBt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //检查是否已经获得相机的权限
                if (verifyPermissions(MainActivity.this, PERMISSIONS_STORAGE[2]) == 0) {
                    Log.i(TAG, "提示是否要授权");
                    ActivityCompat.requestPermissions(MainActivity.this, PERMISSIONS_STORAGE, 3);
                } else {
                    //已经有权限
                    toCamera();  //打开相机
                }
            }
        });
        photoBt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                toPicture();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case TAKE_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        //将拍摄的照片显示出来
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(ImageUri));
                        camereIv.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            case TAKE_CAMARA:
                if (resultCode == RESULT_OK) {
                    try {
                        //将相册的照片显示出来
                        Uri uri_photo = data.getData();
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri_photo));
                        photoIv.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            default:
                break;
        }
    }


    /**
     * 检查是否有对应权限
     *
     * @param activity   上下文
     * @param permission 要检查的权限
     * @return 结果标识
     */
    public int verifyPermissions(Activity activity, java.lang.String permission) {
        int Permission = ActivityCompat.checkSelfPermission(activity, permission);
        if (Permission == PackageManager.PERMISSION_GRANTED) {
            Log.i(TAG, "已经同意权限");
            return 1;
        } else {
            Log.i(TAG, "没有同意权限");
            return 0;
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (grantResults != null && grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Log.i(TAG, "用户授权");
            toCamera();
        } else {
            Log.i(TAG, "用户未授权");
        }
    }

    //跳转相册
    private void toPicture() {
        Intent intent = new Intent(Intent.ACTION_PICK);  //跳转到 ACTION_IMAGE_CAPTURE
        intent.setType("image/*");
        startActivityForResult(intent, TAKE_CAMARA);
        Log.i(TAG, "跳转相册成功");
    }

    //跳转相机
    private void toCamera() {
        //创建File对象，用于存储拍照后的图片
//        File outputImage = new File(getExternalCacheDir(), "outputImage.jpg");
        File outputImage = new File(getExternalCacheDir(), System.currentTimeMillis() + ".jpg");
        if (outputImage.exists()) {
            outputImage.delete();
        } else {
            try {
                outputImage.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //判断SDK版本高低，ImageUri方法不同
        if (Build.VERSION.SDK_INT >= 24) {
            ImageUri = FileProvider.getUriForFile(MainActivity.this, "com.mooc.uploadfile4.fileprovider", outputImage);
        } else {
            ImageUri = Uri.fromFile(outputImage);
        }

        //启动相机程序
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, ImageUri);
        startActivityForResult(intent, TAKE_PHOTO);
    }
}

参考了些博客，目前可以获取照片但不能多选。