调用摄像头拍照 camera

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package com.gao.choosepictest;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;/** * 调用摄像头 拍照 * 点击完成，就会回到我们程序的界面。同时，裁剪后的照片当然也会显示出来了 */public class MainActivity extends AppCompatActivity {    public static final int TAKE_PHOTO = 1;    public static final int CROP_PHOTO = 2;    private Button takePhoto; //拍照    private ImageView picture; //显示拍摄图片    private Button chooseFromAlbum;// 从相机中选取    private Uri imageUri;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        takePhoto = (Button) findViewById(R.id.take_photo);        chooseFromAlbum = (Button) findViewById(R.id.choose_from_album);        picture = (ImageView) findViewById(R.id.picture);        //从相册选取        chooseFromAlbum.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //  创建File 用于存储选择的照片                File file = new File(Environment.getExternalStorageDirectory(), "img.png");                if (file.exists()) {                    file.delete();                }                try {                    file.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }                imageUri = Uri.fromFile(file);                Intent intent = new Intent("android.intent.action.GET_CONTENT");                intent.setType("image/*");                intent.putExtra("crop", true); //裁减                intent.putExtra("scale", true); //缩放                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, CROP_PHOTO);            }        });        //相机拍照        takePhoto.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                // 创建File对象，用于存储拍照后的图片                File file = new File(Environment.getExternalStorageDirectory(), "tempImg.jpg");                if (file.exists()) {                    file.delete();                }                try {                    file.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }                //将 File 对象转换成 Uri 对象                imageUri = Uri.fromFile(file);                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, TAKE_PHOTO); // 启动相机程序            }        });    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        switch (requestCode) {            case TAKE_PHOTO:                if (resultCode == RESULT_OK) {                    Intent intent = new Intent("com.android.camera.action.CROP");                    intent.setDataAndType(imageUri, "image/*");                    intent.putExtra("scale", true);                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                    startActivityForResult(intent, CROP_PHOTO); // 启动裁剪程序                }                break;            case CROP_PHOTO:                if (resultCode == RESULT_OK) {                    try {                        //将 output_image.jpg 这张照片解析成 Bitmap 对象                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        picture.setImageBitmap(bitmap); // 将裁剪后的照片显示出来                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }            default:                break;        }        super.onActivityResult(requestCode, resultCode, data);    }}

布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.gao.choosepictest.MainActivity">    <Button        android:id="@+id/choose_from_album"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="从相册中选取" />    <Button        android:text="打开摄像头拍照"        android:id="@+id/take_photo"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>    <ImageView        android:id="@+id/picture"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal" /></LinearLayout>

需要加入的权限

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

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