一、为相机添加权限。在AndroidManifest.xml文件的</application>之后，添加相机使用的权限：
<uses-permission android:name="android.permission.CAMERA"/>
二、编写布局文件main.xml，代码如下：
<?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"
>
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="320px"
android:layout_height="240px"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="打开"
/>
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="关闭"
/>
</LinearLayout>
</LinearLayout>
三、编写MainActivity.java代码。
package game.test;
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements SurfaceHolder.Callback {
Camera myCamera;
SurfaceView mySurfaceView;
SurfaceHolder mySurfaceHolder;
Button btn1, btn2;
boolean isPreview = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mySurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
mySurfaceHolder = mySurfaceView.getHolder();
mySurfaceHolder.addCallback(this);
mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
initCamera();
}
});
btn2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (myCamera != null && isPreview) {
myCamera.stopPreview();
myCamera.release();
myCamera = null;
isPreview = false;
}
}
});
}
public void initCamera() {
if (!isPreview) {
myCamera = Camera.open();
}
if (myCamera != null && !isPreview) {
try {
myCamera.setPreviewDisplay(mySurfaceHolder);
myCamera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
isPreview = true;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
作者 “Android学习心得”
