Android - 相机预览 [英] Android - Camera Preview

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问题描述

我在尝试相机预览

这是我的代码,它不会引发任何错误,但屏幕仍然是黑色的。任何想法?

This is my code and it doesn't throw any error, but the screen is still black. Any ideas?

this.setContentView(R.layout.camerapreview);    
SurfaceView cameraSurface = (SurfaceView)findViewById(R.id.cpPreview);
SurfaceHolder holder = cameraSurface.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
this.camera = Camera.open();
this.camera.setPreviewDisplay(holder);
this.camera.startPreview();

camerapreview.xml

camerapreview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
    <SurfaceView
        android:id="@+id/cpPreview"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_gravity="center">

    </SurfaceView>
</LinearLayout>


推荐答案

你必须等待表面准备,然后调用 setPreviewDisplay(),你必须等待表面的大小( surfaceChanged()),然后调用 startPreview()此项目具有您所需要的。

You are calling the last three lines too early. You have to wait for the surface to be prepared before calling setPreviewDisplay() and you have to wait for the surface to be sized (surfaceChanged()) before calling startPreview(). This project has what you need.

这篇关于Android - 相机预览的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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