01-11 01:13 阅读 261

Android实现调用摄像头拍照并存储照片

本文主要介绍了如何利用Android调用摄像头拍照，并显示拍照后的图片到ImageView中，文中的示例代码讲解详细，感兴趣的可以动手试一试

1、前期准备

需要在Manifest中添加相关权限

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<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />

<uses-feature android:name="android.hardware.camera.autofocus" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

1 2	`Intent intent =` `new` `Intent(MediaStore.ACTION_IMAGE_CAPTURE);//调用Camera` `startActivityForResult(intent, Activity.RESULT_OK);//如果正常，则返回 Activity.RESULT_OK 本质为 int类型的1`

Environment.MEDIA_MOUNTED sd卡在手机上正常使用状态

Environment.MEDIA_UNMOUNTED 用户手工到手机设置中卸载sd卡之后的状态

Environment.MEDIA_REMOVED 用户手动卸载，然后将sd卡从手机取出之后的状态

Environment.MEDIA_BAD_REMOVAL 用户未到手机设置中手动卸载sd卡，直接拨出之后的状态

Environment.MEDIA_SHARED 手机直接连接到电脑作为u盘使用之后的状态

Environment.MEDIA_CHECKINGS 手机正在扫描sd卡过程中的状态

在代码中的判断

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String sdStatus = Environment.getExternalStorageState();

if(!sdStatus.equals(Environment.MEDIA_MOUNTED)){

                System.out.println(" ------------- sd card is not avaiable ---------------");

                return;

}

String name = "photo.jpg";//定义图片名称

Bundle bundle = data.getExtras();//data为onActivityResult中的intent类型的参数

Bitmap bitmap = (Bitmap) bundle.get("data");//bitmap

//            File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/");

//            file.mkdirs(); //创建文件夹

//            String fileName = Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+name;

String fileName = "sdcard"+"/"+name;//初始化文件路径

FileOutputStream fos =null;//初始化文件输出流

try {

    // System.out.println(fileName);    // 测试用，查看文件路径

    fos=new FileOutputStream(fileName); // 输出文件到外部存储

    //今天第一次正视这个bitmap.compress()方法，它用来压缩图片大小。

/*

        这个方法有三个参数：

        Bitmap.CompressFormat format 图像的压缩格式；

        int quality 图像压缩率，0-100。 0 压缩100%，100意味着不压缩；

        OutputStream stream 写入压缩数据的输出流；

        public boolean compress(CompressFormat format, int quality, OutputStream stream) {}

        返回值boolean类型

        如果成功地把压缩数据写入输出流，则返回true。

*/

    bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos);    

} catch (FileNotFoundException e) {

    e.printStackTrace();

}finally {

    try {

        fos.flush();    //释放输出流

        fos.close();

    } catch (IOException e) {

        e.printStackTrace();

}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_take_photo"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="take photo"

        android:id="@+id/takephoto"

/>

    <ImageView

        android:layout_below="@+id/takephoto"

        android:layout_width="400dp"

        android:layout_height="400dp"

        android:id="@+id/picture"

/>

</RelativeLayout>

package icu.whatsblog.CameraCrop;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.os.Environment;

import android.provider.MediaStore;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import androidx.appcompat.app.AppCompatActivity;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import lee.suk.cameracrop.R;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ((Button) findViewById(R.id.takephoto)).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                startActivityForResult(intent, 1);

}

});

}

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == Activity.RESULT_OK){

            String sdStatus = Environment.getExternalStorageState();

            if(!sdStatus.equals(Environment.MEDIA_MOUNTED)){

                System.out.println(" ------------- sd card is not avaiable ---------------");

                return;

}

            String name = "photo.jpg";

            Bundle bundle = data.getExtras();

            Bitmap bitmap = (Bitmap) bundle.get("data");

//            File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/");

//            file.mkdirs(); //创建文件夹

//            String fileName = Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+name;

            String fileName = "sdcard"+"/"+name;

            FileOutputStream fos =null;

            try {

                System.out.println(fileName);

                fos=new FileOutputStream(fileName);

                bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos);

            } catch (FileNotFoundException e) {

                e.printStackTrace();

            }finally {

                try {

                    fos.flush();

                    fos.close();

                } catch (IOException e) {

                    e.printStackTrace();

}

}

            ((ImageView) findViewById(R.id.picture)).setImageBitmap(bitmap);

}

}

}

到此这篇关于Android实现调用摄像头拍照并存储照片的文章就介绍到这了

原文链接：https://blog.csdn.net/w_Eternal/article/details/122425400