Android Camera擷取方框範圍內影像

輸出解析度大的情況可以再Manifes內加入

android:largeHeap="true"

避免出現OutOfMemoryError

MyImageView Code

Layout：

<RelativeLayout 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"
    tools:context="com.cyfang.test.MainActivity" >

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true" />

    <com.cyfang.test.MyImageView
        android:id="@+id/myImageView"
        android:layout_width="320px"
        android:layout_height="480px"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="拍照" />

</RelativeLayout>

Manifes：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cyfang.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="15" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="landscape" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Activity：

package com.cyfang.test;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.List;

import android.util.DisplayMetrics;
import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.Point;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements SurfaceHolder.Callback, PictureCallback {

 /** SurfaceView */
 private SurfaceView surfaceView;

 /** Holder */
 private SurfaceHolder holder;

 /** 相機 */
 private Camera camera;

 /** 自訂ImageView */
 private MyImageView imageview;

 /** 拍照按鈕 */
 private Button buttonTake;

 /** 照片寬度 */
 private int picWidth;

 /** 照片寬度 */
 private int picHeight;

 /** 預覽寬度 */
 private int pvWidth;

 /** 預覽高度 */
 private int pvHeight;

 /** 螢幕寬 / 預覽寬 */
 private double screenWithPreviewWidthRate;

 /** 螢幕高 / 預覽高 */
 private double screenWithPreviewHeightRate;

 /** 預覽寬 / 照片高 */
 private double previewWithOutputWidthRate;

 /** 預覽高 / 照片高 */
 private double previewWithOutputHeightRate;

 /** 螢幕寬 */
 private double screenWidth;

 /** 螢幕高 */
 private double screenHeight;


 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
  setContentView(R.layout.activity_main);

  DisplayMetrics displaymetrics = new DisplayMetrics();
  getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
  screenWidth = displaymetrics.widthPixels;
  screenHeight = displaymetrics.heightPixels;

  imageview = (MyImageView) findViewById(R.id.myImageView);

  buttonTake = (Button) findViewById(R.id.button1);

  // 按鈕點擊事件
  buttonTake.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    camera.takePicture(null, null, MainActivity.this);
   }
  });

  surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
  surfaceView.setZOrderOnTop(false);
  holder = surfaceView.getHolder();
  holder.addCallback(this);
  holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
 }

 @Override
 protected void onStop() {
  if (camera != null) {
   camera.stopPreview();
   camera.release();
   camera = null;
  }
  super.onStop();
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // Handle action bar item clicks here. The action bar will
  // automatically handle clicks on the Home/Up button, so long
  // as you specify a parent activity in AndroidManifest.xml.
  int id = item.getItemId();
  if (id == R.id.action_settings) {
   return true;
  }
  return super.onOptionsItemSelected(item);
 }

 @Override
 public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
  // TODO Auto-generated method stub

 }

 @Override
 public void surfaceCreated(SurfaceHolder holder) {
  try {
   if (camera == null) {
    camera = Camera.open(CameraInfo.CAMERA_FACING_BACK);

    // 取得相機參數
    Parameters parameters = camera.getParameters();

    // 關閉閃光燈
    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);

    // 預覽尺寸清單
    List<Size> previewList = parameters.getSupportedPreviewSizes();

    // 照片尺寸清單
    List<Size> pictureList = parameters.getSupportedPictureSizes();

    picWidth = pictureList.get(0).width;
    picHeight = pictureList.get(0).height;
    // 設定最佳照片尺寸
    parameters.setPictureSize(picWidth, picHeight);

    pvWidth = previewList.get(0).width;
    pvHeight = previewList.get(0).height;

    // 設定最佳預覽尺寸
    parameters.setPreviewSize(pvWidth, pvHeight);

    // 設定相機參數
    camera.setParameters(parameters);

    // 設定顯示的Holder
    camera.setPreviewDisplay(holder);
    screenWithPreviewHeightRate = screenHeight >= previewHeight ? screenHeight / previewHeight
          : previewHeight / screenHeight;
    screenWithPreviewWidthRate = screenWidth >= previewWidth ? screenWidth / previewWidth
          : previewWidth / screenWidth;
    previewWithOutputHeightRate = previewHeight >= picHeight ? previewHeight / picHeight
          : picHeight / previewHeight;
    previewWithOutputWidthRate = previewWidth >= picWidth ? previewWidth / picWidth : picWidth / previewWidth;
    // 開始顯示
    camera.startPreview();
   }
  } catch (IOException e) {
  } catch (RuntimeException e) {
  }

 }

 @Override
 public void surfaceDestroyed(SurfaceHolder holder) {
  // TODO Auto-generated method stub

 }

 @Override
 public void onPictureTaken(byte[] data, Camera camera) {
  try {
    System.gc();
    // 取得ImageView x,y
    int[] location = new int[2];
    imageViewRect.getLocationOnScreen(location);
    Log.i("x", location[0] + "," + location[1]);
    int x = (int) (screenWithPreviewWidthRate * previewWithOutputWidthRate * (double) location[0]);
    int y = (int) (screenWithPreviewHeightRate * previewWithOutputHeightRate * (double) location[1]);
    int width = (int) (screenWithPreviewWidthRate * previewWithOutputWidthRate * (double) rectWidth);
    int height = (int) (screenWithPreviewHeightRate * previewWithOutputHeightRate * (double) rectHeight);

    Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

    // 擷取範圍
    Bitmap bitmapRect = Bitmap.createBitmap(bitmap, x, y, width, height);

    // 釋放bitmap資源
    bitmap.recycle();
    bitmap = null;
 
 
    FileOutputStream fileOutputStream = new FileOutputStream(
    new File("/sdcard/" + new Date().getTime() + ".jpg"));
    bitmapRect.compress(CompressFormat.JPEG, 90, fileOutputStream);
    bitmapRect.recycle();
    bitmapRect = null;
 
    // 寫入檔案
    fileOutputStream.flush();
    fileOutputStream.close();
    fileOutputStream = null;
 
    // 重啟相機預覽功能
    camera.startPreview();

  } catch (IOException e) {
   Log.i("Tack_IOException", e.getMessage());
  }
 }

}

擷取前：

擷取後：