package com.future.driver.utils.view;
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import android.content.Context;
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import android.hardware.Camera;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import java.io.IOException;
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/**
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* Created by allens on 2017/3/15.
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*/
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public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
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private SurfaceHolder mHolder;
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private Camera mCamera;
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public CameraPreview(Context context, Camera camera) {
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super(context);
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//初始化Camera对象
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mCamera = camera;
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//得到SurfaceHolder对象
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mHolder = getHolder();
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//添加回调，得到Surface的三个声明周期方法
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mHolder.addCallback(this);
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// deprecated setting, but required on Android versions prior to 3.0
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mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
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}
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@Override
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public void surfaceCreated(SurfaceHolder holder) {
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try {
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//设置预览方向
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mCamera.setDisplayOrientation(90);
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//把这个预览效果展示在SurfaceView上面
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mCamera.setPreviewDisplay(holder);
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//开启预览效果
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mCamera.startPreview();
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} catch (IOException e) {
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// Log.d(TAG, "Error setting camera preview: " + e.getMessage());
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}
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}
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@Override
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public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
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if (holder.getSurface() == null) {
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return;
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}
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//停止预览效果
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mCamera.stopPreview();
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//重新设置预览效果
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try {
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mCamera.setPreviewDisplay(mHolder);
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} catch (IOException e) {
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e.printStackTrace();
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}
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mCamera.startPreview();
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}
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@Override
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public void surfaceDestroyed(SurfaceHolder holder) {
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}
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}
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