自定義拍照會用到SurfaceView控件顯示照片的預覽區域，以下是布局文件：
兩個TextView是用來顯示提示信息和倒計時的秒數的
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<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" android:background="#266194" android:orientation="vertical" tools:context=".TestActivity" > <SurfaceView android:id="@+id/surfaceView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_centerInParent="true" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="請調整位置到此區域" android:textColor="#ff0000" android:textSize="32sp" /> <TextView android:id="@+id/tv_time" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingTop="10dp" android:gravity="center_horizontal" android:textColor="#266194" android:textSize="32sp" /> </LinearLayout></RelativeLayout> |
接下來是mainActivity中的具體實現以及詳細注釋：
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package com.dhsr.pujiejia.ui;import java.io.File;import java.io.FileOutputStream;import java.text.SimpleDateFormat;import java.util.Date;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.res.Configuration;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.PixelFormat;import android.hardware.Camera;import android.hardware.Camera.CameraInfo;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.Window;import android.view.WindowManager;import android.widget.TextView;import com.example.pujiejiaapp.R;@SuppressLint({ "NewApi", "SdCardPath" })public class CameraActivity extends Activity implements Runnable { // 預覽圖片范圍 private SurfaceView surfaceView; private TextView tv_time; // 倒計時拍攝 private int cameratime = 4; private Camera camera; private boolean preview = false; // 文件名字 private String filename; // 文件名字的帶的時間戳 private String timeString; // 格式化時間 private SimpleDateFormat dateFormat; // 日期對象 private Date date; // 控制線程 boolean stopThread = false; private File file; String photo; private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { int what = msg.what; switch (what) { case 222: tv_time.setText("" + cameratime); if ("0".equals(tv_time.getText().toString())) { tv_time.setText("拍攝成功！"); takePhoto(); } break; } }; }; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); CameraActivity.this.setFinishOnTouchOutside(false); // 初始化數據 findView(); surfaceView.getHolder().addCallback(new SufaceListener()); /* 下面設置Surface不維護自己的緩沖區，而是等待屏幕的渲染引擎將內容推送到用戶面前 */ surfaceView.getHolder() .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceView.getHolder().setFixedSize(200, 200); // 設置分辨率 } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); // 開啟線程 new Thread(this).start(); } private final class SufaceListener implements SurfaceHolder.Callback { /** * surface改變 */ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } /** * surface創建 */ @Override public void surfaceCreated(SurfaceHolder holder) { try { for (int i = 0; i < Camera.getNumberOfCameras(); i++) { CameraInfo info = new CameraInfo(); Camera.getCameraInfo(i, info); // 調用系統的前置攝像頭 if (info.facing == CameraInfo.CAMERA_FACING_FRONT) { camera = Camera.open(i); } } Camera.Parameters parameters = camera.getParameters(); /* 每秒從攝像頭捕獲5幀畫面， */ parameters.setPreviewFrameRate(5); /* 設置照片的輸出格式:jpg */ parameters.setPictureFormat(PixelFormat.JPEG); /* 照片質量 */ parameters.set("jpeg-quality", 85); WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); camera.setParameters(parameters); camera.setPreviewDisplay(surfaceView.getHolder());// 通過SurfaceView顯示取景畫面 camera.startPreview(); preview = true; } catch (Exception e) { } } /** * surface銷毀 */ @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { if (preview) camera.stopPreview(); camera.release(); camera = null; } } } /** * 拍攝照片 */ private void takePhoto() { // 執行拍照效果 camera.takePicture(null, null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); timeString = formatDate(); //保存到data/data目錄自定義文件夾下 filename = "/data/data/com.example.pujiejiaapp/images/" + timeString + ".jpg"; File file = new File(filename); boolean createNewFile = file.createNewFile() System.out.println("創建文件夾成功沒有" + createNewFile); System.out.println(file); FileOutputStream outStream = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 60, outStream); outStream.flush(); outStream.close(); // 重新瀏覽 camera.stopPreview(); camera.startPreview(); preview = true; } catch (Exception e) { e.printStackTrace(); } finally { } } }); } @Override public void run() { while (!stopThread) { try { //按秒數倒計時 Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } cameratime--; mHandler.sendEmptyMessage(222); if (cameratime <= 0) { break; } } } // 初始化數據 private void findView() { surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView); tv_time = (TextView) findViewById(R.id.tv_time); } // 格式化系統的時間 public String formatDate() { date = new Date(System.currentTimeMillis()); // 日期格式 dateFormat = new SimpleDateFormat("'IMG'_yyyyMMddHHmmss"); return dateFormat.format(date); } @Override protected void onDestroy() { // TODO Auto-generated method stub // 線程已關閉 super.onDestroy(); stopThread = true; }} |
核心代碼詳解：
1.創建SurfaceView時，surfaceCreated()方法中
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for (int i = 0; i < Camera.getNumberOfCameras(); i++) { CameraInfo info = new CameraInfo(); Camera.getCameraInfo(i, info); // 調用系統的前置攝像頭 if (info.facing == CameraInfo.CAMERA_FACING_FRONT) { camera = Camera.open(i); } } |
此部分代碼為打開相機時默認打開前置攝像頭CameraInfo.CAMERA_FACING_BACK為默認打開后置攝像頭，CameraInfo.CAMERA_FACING_FRONT前置攝像頭
2.照片拍攝takePhoto()方法中：
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Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); timeString = formatDate(); filename = "/data/data/com.example.pujiejiaapp/images/" + timeString + ".jpg"; photo = timeString + ".jpg"; File file = new File(filename); boolean createNewFile = file.createNewFile(); FileOutputStream outStream = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 60, outStream); |
此部分代碼為將拍攝到的圖片保存為以bitmap格式保存在指定的目錄下
3.開子線程用于倒計時拍攝
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public void run() { while (!stopThread) { try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } cameratime--; mHandler.sendEmptyMessage(222); if (cameratime <= 0) { break; } } } |
希望大家理解核心代碼的詳細注釋，歡迎提供意見，希望能給大家帶來幫助，謝謝！
