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:
<?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.gyq.cameraalbumtest.MainActivity"> <Button android:id="@+id/btn_take_photo" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="take photo"/> <Button android:id="@+id/choose_from_album" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="choose from album"/> <ImageView android:id="@+id/iv_picture" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"/> </LinearLayout>
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/*"); startActivityForResult(intent, CHOOSE_PHOTO); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case 1: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { openAlbum(); } else { Toast.makeText(this, "you denied the permission", Toast.LENGTH_SHORT).show(); } break; } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case TAKE_PHOTO: if (resultCode == RESULT_OK) { try { Bitmap bm = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri)); picture.setImageBitmap(bm); } catch (Exception e) { e.printStackTrace(); } } break; case CHOOSE_PHOTO: if (resultCode == RESULT_OK) { if (Build.VERSION.SDK_INT >= 19) { //4.4及以上的系统使用这个方法处理图片; handleImageOnKitKat(data); } else { handleImageBeforeKitKat(data); //4.4及以下的系统使用这个方法处理图片 } } default: break; } } private void handleImageBeforeKitKat(Intent data) { Uri uri = data.getData(); String imagePath = getImagePath(uri, null); displayImage(imagePath); } private String getImagePath(Uri uri, String selection) { String path = null; //通过Uri和selection来获取真实的图片路径 Cursor cursor = getContentResolver().query(uri, null, selection, null, null); if (cursor != null) { if (cursor.moveToFirst()) { path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); } cursor.close(); } return path; } private void displayImage(String imagePath) { if (imagePath != null) { Bitmap bitmap = BitmapFactory.decodeFile(imagePath); picture.setImageBitmap(bitmap); } else { Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show(); } } /** * 4.4及以上的系统使用这个方法处理图片 * * @param data */ @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:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.gyq.cameraalbumtest"> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <provider android:authorities="com.gyq.cameraalbumtest.fileprovider" android:name="android.support.v4.content.FileProvider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths"/> </provider> </application> </manifest>
4、xml文件夹中的文件
<?xml version = "1.0" encoding = "utf-8"?> <paths xmlns:android = "http://schemas.android.com/apk/res/android"> <external-path name = "my_images" path = ""></external-path> </paths>
OK,完成收工。请继续关注我的博客。谢谢!
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