Android调用手机摄像头的方法
本文实例为大家分享了Android调用手机摄像头的具体代码,供大家参考,具体内容如下
根据<第一行代码>进行改写:
布局文件,只有一个按钮,和一个Imageview,imageview用于显示拍下后的图片
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout 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" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/take_photo" android:text="Take Photo"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:id="@+id/picture"/> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package com.example.choosepictest; import androidx.appcompat.app.AppCompatActivity; import androidx.core.content.ContextCompat; import androidx.core.content.FileProvider; import android.Manifest; import android.app.Activity; import android.content.ContentValues; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Camera; import android.graphics.Matrix; import android.media.ExifInterface; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.view.View; import android.view.WindowManager; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; public class MainActivity extends AppCompatActivity { public static final int TAKE_PHOTO=1; private Button takePhoto; private ImageView picture; private Uri imageUri; public static File tempFile; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); takePhoto = (Button) findViewById(R.id.take_photo); picture = (ImageView) findViewById(R.id.picture); takePhoto.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { tempFile=new File(getExternalCacheDir(),"output_image.jpg"); if(tempFile.exists()) { tempFile.delete(); } try { tempFile.createNewFile(); } catch (IOException e) { e.printStackTrace(); } if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.N) { imageUri= FileProvider.getUriForFile(MainActivity.this, "com.example.choosepictest.fileprovider",tempFile); }else{ Uri.fromFile(tempFile); } Intent intent=new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri); startActivityForResult(intent,TAKE_PHOTO); } }); } protected void onActivityResult(int requestCode,int resultCode,Intent data) { super.onActivityResult(requestCode,requestCode,data); switch (requestCode) { case TAKE_PHOTO: if(resultCode==Activity.RESULT_OK) { Bitmap bitmap= null; try { bitmap = BitmapFactory.decodeStream(getContentResolver() .openInputStream(imageUri)); } catch (FileNotFoundException e) { e.printStackTrace(); } picture.setImageBitmap(rotateIfRequired(bitmap)); } break; default: break; } } private Bitmap rotateIfRequired(Bitmap bitmap) { String path=tempFile.getPath(); ExifInterface exif = null; try { exif=new ExifInterface(path); } catch (IOException e) { e.printStackTrace(); } int orientation= exif.getAttributeInt(ExifInterface.TAG_EXIF_VERSION, ExifInterface.ORIENTATION_NORMAL); switch (orientation) { case ExifInterface.ORIENTATION_ROTATE_90: bitmap=rotateBitmap(bitmap,90); break; case ExifInterface.ORIENTATION_ROTATE_180: bitmap=rotateBitmap(bitmap,180); break; case ExifInterface.ORIENTATION_ROTATE_270: bitmap=rotateBitmap(bitmap,270); break; default: break; } return bitmap; } private Bitmap rotateBitmap(Bitmap bitmap,int degree) { Matrix matrix=new Matrix(); matrix.postRotate((float)degree); Bitmap rotateBitmap=Bitmap.createBitmap(bitmap,0,0, bitmap.getWidth(),bitmap.getHeight(),matrix,true); bitmap.recycle(); return bitmap; } }
活动管理(mainfest):
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.choosepictest"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.ChoosePicTest"> <activity android:name=".MainActivity" android:exported="true"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <provider android:authorities="com.example.choosepictest.fileprovider" android:name="androidx.core.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>
用于指定路径file_paths.xml:
<?xml version="1.0" encoding="utf-8" ?> <paths xmlns:android="http://schemas.android.com/apk/res/android"> <external-path name="my_images" path="/"/> </paths>
效果图:
这是虚拟机,所以啥也看不到,真机就可以看到了。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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