camera预览

最新推荐文章于 2024-08-27 16:51:05 发布

oJiuYue1234567890

最新推荐文章于 2024-08-27 16:51:05 发布

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本文链接：https://blog.youkuaiyun.com/oJiuYue1234567890/article/details/86596882

几个接口api 实现camera预览，初学者达到很好的认识也不复杂。关键点是使用surfaceview 和 surfaceholder这个接口，它的作用就像一个关于Surface的监听器。它通过三个回调方法，让我们能够感知到Surface的创建、销毁或者改变。
package com.example.camerapreviewactivity;

import java.io.IOException;

import android.support.v7.app.ActionBarActivity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MainActivity extends ActionBarActivity {

Camera camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	SurfaceView surfaceview  = (android.view.SurfaceView) findViewById(R.id.camera);
	SurfaceHolder holder = surfaceview.getHolder(); //获取SurfaceHolder
	holder.addCallback(new Callback());
}
public class Callback implements SurfaceHolder.Callback {

	@Override
	public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
			int arg3) {
		// TODO Auto-generated method stub
		camera.startPreview();
		
	}

	@Override
	public void surfaceCreated(SurfaceHolder arg0) {
		// TODO Auto-generated method stub
		camera = Camera.open();
		camera.setDisplayOrientation(90);
		try {
			camera.setPreviewDisplay(arg0);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder arg0) {
		// TODO Auto-generated method stub
		
	}

}

}