Android 自定義相機Demo 入門學習
阿新 • • 發佈：2018-12-25
Android 自定義相機Demo
本文是參考網上一些自定義相機示例，再結合自己對相機的功能需求寫的，基本上包含了很多基本功能，比如相機對焦、閃光燈，以及在手機預覽介面上繪製自己想要繪製的圖案。
話不多說，先上一張圖：
應用是在Android Studio中開發的，java程式如下：
//主程式
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import /**
* 定義一個預覽類 預覽介面設定
*/
import android.annotation.SuppressLint;
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
@SuppressLint("NewApi")
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "main";
private SurfaceHolder mHolder;
@SuppressWarnings("deprecation")
private Camera mCamera;
@SuppressWarnings("deprecation")
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// 通過SurfaceView獲得SurfaceHolder
mHolder = getHolder();
// 為SurfaceHolder指定回撥
mHolder.addCallback(this);
mCamera.setDisplayOrientation(90);
}
public void surfaceCreated(SurfaceHolder holder) {
// 當Surface被建立之後，開始Camera的預覽
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d(TAG, "預覽失敗");
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Surface發生改變的時候將被呼叫，第一次顯示到介面的時候也會被呼叫
if (mHolder.getSurface() == null){
// 如果Surface為空，不繼續操作
return;
}
// 停止Camera的預覽
try {
mCamera.stopPreview();
} catch (Exception e){
Log.d(TAG, "當Surface改變後，停止預覽出錯");
}
// 重新開始預覽
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d(TAG, "預覽Camera出錯");
}
}
}
/**
* Created by Administrator on 2018/1/24.
* 這個是在預覽介面繪製圖案部分
*/
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.View;
public class Draw extends View
{
private Canvas canvas;//宣告畫筆
private Paint paint;//宣告畫布
private Paint paint1;
private Paint paint2;
private Bitmap bitmap;//宣告點陣圖
public Draw(Context context)
{
super(context);
// TODO 自動生成的建構函式存根
//建立一個畫筆
paint = new Paint(Paint.DITHER_FLAG);
paint1 = new Paint(Paint.DITHER_FLAG);
paint2 = new Paint(Paint.DITHER_FLAG);
//設定點陣圖的寬高，採用32位ARGB點陣圖模式
bitmap = Bitmap.createBitmap(720, 1280, Bitmap.Config.ARGB_8888);
canvas = new Canvas(bitmap);
paint.setStyle(Paint.Style.STROKE);//設定非填充
paint.setStrokeWidth(2);//筆寬5畫素
paint.setColor(Color.RED);//設定為紅筆
paint.setAntiAlias(true);//鋸齒不顯示
paint.setDither(true);//設定影象抖動處理
paint.setStrokeJoin(Paint.Join.ROUND);//設定影象的結合方式
paint.setStrokeCap(Paint.Cap.ROUND);//設定畫筆為圓形樣式
paint1.setStyle(Paint.Style.FILL);//設定非填充
paint1.setStrokeWidth(33);//筆寬5畫素
paint1.setStrokeJoin(Paint.Join.ROUND);//設定影象的結合方式
paint1.setStrokeCap(Paint.Cap.ROUND);//設定畫筆為圓形樣式
paint1.setColor(Color.BLACK);//設定為黑筆
paint.setAntiAlias(true);//鋸齒不顯示
paint.setDither(true);//設定影象抖動處理
paint2.setStyle(Paint.Style.FILL);//設定填充
paint2.setStrokeWidth(12);//筆寬5畫素
paint2.setAntiAlias(true);//鋸齒不顯示
paint2.setDither(true);//設定影象抖動處理
paint2.setStrokeJoin(Paint.Join.ROUND);//設定影象的結合方式
paint2.setStrokeCap(Paint.Cap.ROUND);//設定畫筆為圓形樣式
paint2.setColor(Color.BLACK);//設定為黑筆
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas)
{
// TODO 自動生成的方法存根
super.onDraw(canvas);
canvas.drawBitmap(bitmap, 0, 0, paint);
float[] pts = {0,240,260,70};
canvas.drawLines(pts , paint); //在畫布上畫線 1
float[] pts2 = {695,522,340,1040};
canvas.drawLines(pts2, paint); //在畫布上畫線 2
Path mPath = new Path();
mPath.moveTo(260, 70);
mPath.quadTo(780, 0, 695, 522);
canvas.drawPath(mPath, paint); //塞爾塔曲線
Path path = new Path(); //定義一條路徑
path.moveTo(0,0); //移動到 座標(0,0)
path.lineTo(0,240);
path.lineTo(270,62);
path.lineTo(270,0);
path.lineTo(0,0);
canvas.drawPath(path, paint2);
Path path1 = new Path(); //定義一條路徑
path1.moveTo(260,0); //移動到 座標(260,0)
path1.lineTo(720,0);
path1.lineTo(720,60);
path1.lineTo(260,60);
path1.lineTo(260,0);
canvas.drawPath(path1, paint2);
Path path2 = new Path(); //定義一條路徑
path2.moveTo(720,60); //移動到 座標(720,60)
path2.lineTo(720,522);
path2.lineTo(715,522);
path2.lineTo(715,512);
path2.lineTo(700,60);
path2.lineTo(720,60);
canvas.drawPath(path2, paint2);
Path path3 = new Path(); //定義一條路徑
path3.moveTo(340,1040); //移動到 座標(340,1040)
path3.lineTo(720,1040);
path3.lineTo(720,522);
path3.lineTo(710,512);
path3.lineTo(340,1040);
canvas.drawPath(path3, paint2);
Path path4 = new Path(); //定義一條路徑
path4.moveTo(720,200); //移動到 座標(715,512)
path4.lineTo(500,60);
path4.lineTo(720,60);
path4.lineTo(720,200);
canvas.drawPath(path4, paint2);
float[] pts3 = {720,108,450,56};
canvas.drawLines(pts3, paint2); //在畫布上畫線 3
float[] pts4 = {715,230,630,110};
canvas.drawLines(pts4, paint1); //在畫布上畫線 4
float[] pts5 = {660,130,718,272};
canvas.drawLines(pts5, paint1); //在畫布上畫線 5
float[] pts6 = {714,522,720,440};
canvas.drawLines(pts6, paint1); //在畫布上畫線 6
}
}佈局檔案 activity_camera.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
/>
<Button
android:id="@+id/button_capture"
android:text="拍照"
android:textColor="#6633cc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
/>
</LinearLayout>應用許可權：
<uses-permission android:name="android.permission.CAMERA"/> >
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />具體的細節就不在說明，可以自己在網上搜一下相關知識，大家使用中有什麼問題可以留言哦，如果能解決儘量幫大家解決。