安卓高级8 SurfaceView案例二 自定义相机

效果:(由于不好录屏所以文字描述)

定一个SurfaceView 下方有几个按钮,点击确定可以拍照保存取消.

并且SurfaceView实时显示相机内容

package qianfeng.com.customcamera;

import android.hardware.Camera;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View; import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException; public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback { private SurfaceView surfaceView;
private SurfaceHolder holder;
private Camera camera;
private byte[] bitmap_byte;
private int flag = 0; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView) findViewById(R.id.camera_sv); holder = surfaceView.getHolder();
//设置 Holder 的类型 表示内容 表示内容为空由其他提供
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.addCallback(this); // 实例化Camera 参数表示 0: 后置摄像头 1:前置摄像头
camera = Camera.open(flag);
// 按照顺时针方向旋转90度
camera.setDisplayOrientation(90);
// 获取一共有多少个摄像头
// Camera.getNumberOfCameras();
} public void onClick(View view) {
switch (view.getId()) {
case R.id.take_bt:
/*
参数1: 捕捉画面回调
参数2:原声图片回调
参数3: 处理过后的图片回调
*/
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
//停止预览
camera.stopPreview();
// 记录图片数据
bitmap_byte = data;
}
});
break;
case R.id.cancel_bt:
//取消
bitmap_byte = null;
// 开启预览
camera.startPreview();
break;
case R.id.save_bt:
// 保存
saveToSd();
break;
case R.id.change_bt:
// 切换前后摄像头
//先释放
camera.stopPreview();
camera.release();
camera = null; // 切换摄像头标记 与当前的标记相反即可
if (flag == 1)
flag = 0;
else if (flag == 0)
flag = 1; // 重新开启相机
camera = Camera.open(flag);
camera.setDisplayOrientation(90);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
} // 保存图片到SD卡
private void saveToSd() {
String filPath = null;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
filPath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "xixi.png";
}
try {
FileOutputStream out = new FileOutputStream(filPath);
out.write(bitmap_byte, 0, bitmap_byte.length);
out.flush();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} @Override
public void surfaceCreated(SurfaceHolder holder) {
if (camera != null) {
try {
// 提供预览画面
camera.setPreviewDisplay(holder);
// 开启预览
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
} @Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null) {
// 销毁的时候停止预览
camera.stopPreview();
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="qianfeng.com.customcamera.MainActivity"> <SurfaceView
android:id="@+id/camera_sv"
android:layout_width="match_parent"
android:layout_height="400dp" /> <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"> <Button
android:id="@+id/take_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="拍照" /> <Button
android:id="@+id/cancel_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="取消" /> <Button
android:id="@+id/save_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="保存" /> <Button
android:id="@+id/change_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="切换" /> </LinearLayout>
</LinearLayout>
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