Android调用摄像头拍照开发教程

现在很多应用中都会要求用户上传一张图片来作为头像，首先我在这接收使用相机拍照和在相册中选择图片。接下来先上效果图：

接下来看代码：

1、布局文件：

2、MainActivity.java逻辑代码：

package com.gyq.cameraalbumtest;

import android.Manifest;
import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.documentsContract;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;

public class MainActivity extends AppCompatActivity {
  public static final int TAKE_PHOTO = 1;
  public static final int CHOOSE_PHOTO = 2;
  private Button mTakePhoto, mChoosePhoto;
  private ImageView picture;
  private Uri imageUri;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTakePhoto = (Button) findViewById(R.id.btn_take_photo);
    mChoosePhoto = (Button) findViewById(R.id.choose_from_album);
    picture = (ImageView) findViewById(R.id.iv_picture);

    mTakePhoto.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 outputImage = new File(getExternalCacheDir(), "output_image.jpg");

 try {
   if (outputImage.exists()) {
     outputImage.delete();
   }
   outputImage.createNewFile();

 } catch (Exception e) {
   e.printStackTrace();
 }

 if (Build.VERSION.SDK_INT >= 24) {
   imageUri = FileProvider.getUriForFile(MainActivity.this,
"com.gyq.cameraalbumtest.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);
      }
    });

    mChoosePhoto.setonClickListener(new View.onClickListener() {
      @Override
      public void onClick(View v) {
 if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
   ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
 } else {
   openAlbum();
 }
      }
    });
  }

  //打开相册
  private void openAlbum() {
    Intent intent = new Intent("android.intent.action.GET_CONTENT");
    intent.setType("image
  @TargetApi(19)
  private void handleImageonKitKat(Intent data) {
    String imagePath = null;
    Uri uri = data.getData();
    if (documentsContract.isdocumentUri(this, uri)) {
      //如果document类型的Uri,则通过document来处理
      String docID = documentsContract.getdocumentId(uri);
      if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
 String id = docID.split(":")[1];   //解析出数字格式的id
 String selection = MediaStore.Images.Media._ID + "=" + id;

 imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
      } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
 Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/piblic_downloads"), Long.valueOf(docID));

 imagePath = getImagePath(contentUri, null);

      }

    } else if ("content".equalsIgnoreCase(uri.getScheme())) {
      //如果是content类型的uri，则使用普通方式使用
      imagePath = getImagePath(uri, null);
    } else if ("file".equalsIgnoreCase(uri.getScheme())) {
      //如果是file类型的uri，直接获取路径即可
      imagePath = uri.getPath();

    }

    displayImage(imagePath);
  }
}

3、清单文件：

4、xml文件夹中的文件

OK，完成收工。请继续关注我的博客。谢谢！

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