硬件环境：小米4
android版本：6.0
咱们先看效果图：
我把代码贴出来：
androidmainfest.xml文件（需要新增camera权限）：
<uses-permission android:name="android.permission.camera" />
activity_main.xml文件：
我要评论
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.bihu.qdemopush.mainactivity">
<linearlayout
android:layout_width="match_parent"
android:layout_height="200dp"
android:orientation="horizontal">
<surfaceview
android:id="@+id/surfaceview1"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="fill_parent" />
<surfaceview
android:id="@+id/surfaceview2"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_marginleft="5dp"
android:layout_height="fill_parent" />
</linearlayout>
</linearlayout>
mainactivity.java文件：主要是对2个surfaceview的显示渲染
public class mainactivity extends appcompatactivity {
surfaceview surfaceview1, surfaceview2;
surfaceholder surfaceholder1, surfaceholder2;
string tag = "mainactivity";
private camera camera1 = null, camera2;
camera.parameters parameters;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
surfaceview1 = (surfaceview) findviewbyid(r.id.surfaceview1);
surfaceview2 = (surfaceview) findviewbyid(r.id.surfaceview2);
surfaceholder1 = surfaceview1.getholder();
surfaceholder1.settype(surfaceholder.surface_type_push_buffers);
surfaceholder1.addcallback(new surfaceholdercallbackback());
surfaceholder2 = surfaceview2.getholder();
surfaceholder2.settype(surfaceholder.surface_type_push_buffers);
surfaceholder2.addcallback(new surfaceholdercallbackfont());
}
@override
protected void ondestroy() {
log.e(tag, "ondestroy");
super.ondestroy();
}
/**
* 后置摄像头回调
*/
class surfaceholdercallbackback implements surfaceholder.callback {
@override
public void surfacecreated(surfaceholder holder) {
// 获取camera对象
int cameracount = camera.getnumberofcameras();
if (cameracount > 0) {
camera1 = camera.open(0);
try {
// 设置预览监听
camera1.setpreviewdisplay(holder);
camera.parameters parameters = camera1.getparameters();
if (mainactivity.this.getresources().getconfiguration().orientation != configuration.orientation_landscape) {
parameters.set("orientation", "portrait");
camera1.setdisplayorientation(90);
parameters.setrotation(90);
} else {
parameters.set("orientation", "landscape");
camera1.setdisplayorientation(0);
parameters.setrotation(0);
}
camera1.setparameters(parameters);
// 启动摄像头预览
camera1.startpreview();
system.out.println("camera.startpreview");
} catch (ioexception e) {
e.printstacktrace();
camera1.release();
system.out.println("camera.release");
}
}
}
@override
public void surfacechanged(surfaceholder holder, int format, int width, int height) {
camera1.autofocus(new camera.autofocuscallback() {
@override
public void onautofocus(boolean success, camera camera) {
if (success) {
initcamera();// 实现相机的参数初始化
camera.cancelautofocus();// 只有加上了这一句，才会自动对焦。
}
}
});
}
@override
public void surfacedestroyed(surfaceholder holder) {
}
// 相机参数的初始化设置
private void initcamera() {
parameters = camera1.getparameters();
parameters.setpictureformat(pixelformat.jpeg);
parameters.setfocusmode(camera.parameters.focus_mode_continuous_picture);// 1连续对焦
setdispaly(parameters, camera1);
camera1.setparameters(parameters);
camera1.startpreview();
camera1.cancelautofocus();// 2如果要实现连续的自动对焦，这一句必须加上
}
// 控制图像的正确显示方向
private void setdispaly(camera.parameters parameters, camera camera) {
if (integer.parseint(build.version.sdk) >= 8) {
setdisplayorientation(camera, 90);
} else {
parameters.setrotation(90);
}
}
// 实现的图像的正确显示
private void setdisplayorientation(camera camera, int i) {
method downpolymorphic;
try {
downpolymorphic = camera.getclass().getmethod("setdisplayorientation", new class[]{int.class});
if (downpolymorphic != null) {
downpolymorphic.invoke(camera, new object[]{i});
}
} catch (exception e) {
log.e("came_e", "图像出错");
}
}
}
class surfaceholdercallbackfont implements surfaceholder.callback {
@override
public void surfacecreated(surfaceholder holder) {
// 获取camera对象
int cameracount = camera.getnumberofcameras();
if (cameracount == 2) {
camera2 = camera.open(1);
}
try {
// 设置预览监听
camera2.setpreviewdisplay(holder);
camera.parameters parameters = camera2.getparameters();
if (mainactivity.this.getresources().getconfiguration().orientation != configuration.orientation_landscape) {
parameters.set("orientation", "portrait");
camera2.setdisplayorientation(90);
parameters.setrotation(90);
} else {
parameters.set("orientation", "landscape");
camera2.setdisplayorientation(0);
parameters.setrotation(0);
}
camera2.setparameters(parameters);
// 启动摄像头预览
camera2.startpreview();
system.out.println("camera.startpreview");
} catch (ioexception e) {
e.printstacktrace();
camera2.release();
system.out.println("camera.release");
}
}
@override
public void surfacechanged(surfaceholder holder, int format, int width, int height) {
camera2.autofocus(new camera.autofocuscallback() {
@override
public void onautofocus(boolean success, camera camera) {
if (success) {
parameters = camera2.getparameters();
parameters.setpictureformat(pixelformat.jpeg);
parameters.setfocusmode(camera.parameters.focus_mode_continuous_picture);// 1连续对焦
setdispaly(parameters, camera2);
camera2.setparameters(parameters);
camera2.startpreview();
camera2.cancelautofocus();// 2如果要实现连续的自动对焦，这一句必须加上
camera.cancelautofocus();// 只有加上了这一句，才会自动对焦。
}
}
});
}
@override
public void surfacedestroyed(surfaceholder holder) {
}
// 控制图像的正确显示方向
private void setdispaly(camera.parameters parameters, camera camera) {
if (integer.parseint(build.version.sdk) >= 8) {
setdisplayorientation(camera, 90);
} else {
parameters.setrotation(90);
}
}
// 实现的图像的正确显示
private void setdisplayorientation(camera camera, int i) {
method downpolymorphic;
try {
downpolymorphic = camera.getclass().getmethod("setdisplayorientation", new class[]{int.class});
if (downpolymorphic != null) {
downpolymorphic.invoke(camera, new object[]{i});
}
} catch (exception e) {
log.e("came_e", "图像出错");
}
}
}
}
可能出现的问题：
1、没有权限，需要手动打开，代码里由于追求简便，没有主动申请，只在mainfest中注册了
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