美文网首页
Android Studio 上传文件实例_拍照、相机上传图片

Android Studio 上传文件实例_拍照、相机上传图片

作者: 牧区叔叔 | 来源:发表于2020-09-20 15:18 被阅读0次

这是拍照反图片以及相机反图片的简单实例

小白上路先实现效果再谈原理~

这里我就先不写思路了,直接上效果图,哪里不懂的留言即可。

效果

image.png

步骤1、权限(清单文件添加)

 <!--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"/>

步骤2、res文件夹下边创建xml文件file_paths.xml命名

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!--files-path  相当于 getFilesDir()-->
    <files-path name="my_images" path="images"/>
    <!--cache-path  相当于 getCacheDir()-->
    <cache-path name="lalala" path="cache_image"/>
    <!--external-path  相当于 Environment.getExternalStorageDirectory()-->
    <external-path name="hahaha" path="comeOn"/>
    <!--external-files-path  相当于 getExternalFilesDir("") -->
    <external-files-path name="paly" path="freeSoft"/>
    <!--external-cache-path  相当于 getExternalCacheDir() -->
    <external-cache-path  name="lei" path="."/>
</paths>

步骤3、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>
image.png

步骤4、布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/camera_bt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相机" />

    <Button
        android:id="@+id/photo_bt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相册" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:text="以下是展示相机拍照返回的图片" />

    <ImageView
        android:id="@+id/camere_iv"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginTop="6dp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:text="以下是展示相册拍照返回的图片" />

    <ImageView
        android:id="@+id/photo_iv"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginTop="6dp" />

</LinearLayout>
image.png

步骤5、MainActivity代码

package com.mooc.uploadfile4;

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);
    }
}

相关文章

网友评论

      本文标题:Android Studio 上传文件实例_拍照、相机上传图片

      本文链接:https://www.haomeiwen.com/subject/watsyktx.html