Android &引用;无法将参数解析为变量";在尝试获取相机参数时
我是android新手,我正在尝试制作一个应用程序,可以通过变焦和覆盖来访问相机。为了实现缩放,我使用了以下方法: 我尝试使用以下方法初始化“params”: 在构造函数中初始化参数后,我仍然会收到错误“params无法解析为变量” 我错过什么了吗? 任何帮助都将不胜感激 MainActivity.javaAndroid &引用;无法将参数解析为变量";在尝试获取相机参数时,android,camera,zooming,params,Android,Camera,Zooming,Params,我是android新手,我正在尝试制作一个应用程序,可以通过变焦和覆盖来访问相机。为了实现缩放,我使用了以下方法: 我尝试使用以下方法初始化“params”: 在构造函数中初始化参数后,我仍然会收到错误“params无法解析为变量” 我错过什么了吗? 任何帮助都将不胜感激 MainActivity.java package com.reidbailey.droidscope; import java.io.IOException; import android.app.Activity;
package com.reidbailey.droidscope;
import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ZoomControls;
public class MainActivity extends Activity implements SurfaceHolder.Callback{
Camera camera;
int currentZoomLevel = 0, maxZoomLevel = 0;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean cameraview = false;
LayoutInflater inflater = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView = (SurfaceView)findViewById(R.id.cameraview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
inflater = LayoutInflater.from(getBaseContext());
View view = inflater.inflate(R.layout.overlay, null);
LayoutParams layoutParamsControl= new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
this.addContentView(view, layoutParamsControl);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(cameraview){
camera.stopPreview();
cameraview = false;
}
if (camera != null){
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
cameraview = true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
ZoomControls zoomControls = (ZoomControls) findViewById(R.id.CAMERA_ZOOM_CONTROLS);
params = camera.getParameters();
if(params.isZoomSupported()){
maxZoomLevel = params.getMaxZoom();
zoomControls.setIsZoomInEnabled(true);
zoomControls.setIsZoomOutEnabled(true);
zoomControls.setOnZoomInClickListener(new OnClickListener(){
public void onClick(View v){
if(currentZoomLevel < maxZoomLevel){
currentZoomLevel++;
camera.startSmoothZoom(currentZoomLevel);
}
}
});
zoomControls.setOnZoomOutClickListener(new OnClickListener(){
public void onClick(View v){
if(currentZoomLevel > 0){
currentZoomLevel--;
camera.startSmoothZoom(currentZoomLevel);
}
}
});
}
else
zoomControls.setVisibility(View.GONE);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera = null;
cameraview = false;
}
}
package com.reidbailey.droidscope;
导入java.io.IOException;
导入android.app.Activity;
导入android.content.pm.ActivityInfo;
导入android.graphics.PixelFormat;
导入android.hardware.Camera;
导入android.os.Bundle;
导入android.view.LayoutInflater;
导入android.view.SurfaceHolder;
导入android.view.SurfaceView;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.view.ViewGroup.LayoutParams;
导入android.widget.ZoomControls;
公共类MainActivity扩展活动实现SurfaceHolder.Callback{
摄像机;
int currentZoomLevel=0,maxZoomLevel=0;
表面视图表面视图;
浮雕浮雕;
布尔cameraview=false;
排气充气机=空;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN\u ORIENTATION\u横向);
getWindow().setFormat(PixelFormat.UNKNOWN);
surfaceView=(surfaceView)findViewById(R.id.cameraview);
surfaceHolder=surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(surfaceHolder.SURFACE\u TYPE\u PUSH\u缓冲区);
充气器=LayoutInflater.from(getBaseContext());
视图=充气机充气(R.layout.overlay,空);
LayoutParams LayoutParams控件=新的LayoutParams(LayoutParams.FILL\u父级,LayoutParams.FILL\u父级);
this.addContentView(视图,layoutParamsControl);
}
@凌驾
公共无效表面更改(表面文件夹持有者,整型格式,整型宽度,
整数高度){
//TODO自动生成的方法存根
如果(喀麦隆){
camera.stopPreview();
cameraview=假;
}
如果(照相机!=null){
试一试{
摄像头。设置预览显示(surfaceHolder);
camera.startPreview();
cameraview=真实;
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
ZoomControl ZoomControl=(ZoomControl)findViewById(R.id.CAMERA\u ZOOM\u控件);
params=camera.getParameters();
如果(params.isZoomSupported()){
maxZoomLevel=params.getMaxZoom();
ZoomControl.setIsZoomInEnabled(真);
ZoomControl.setIsZoomOutEnabled(真);
setOnZoomInClickListener(新的OnClickListener()){
公共void onClick(视图v){
如果(currentZoomLevel0){
当前缩放级别--;
照相机。开始平滑缩放(当前缩放级别);
}
}
});
}
其他的
ZoomControl.setVisibility(View.GONE);
}
@凌驾
已创建的公共空白表面(表面持有人){
//TODO自动生成的方法存根
camera=camera.open();
}
@凌驾
公共空间表面覆盖(表面覆盖物持有人){
//TODO自动生成的方法存根
camera.stopPreview();
相机。释放();
摄像机=零;
cameraview=假;
}
}
活动\u main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<SurfaceView
android:id="@+id/cameraview"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ZoomControls
android:id="@+id/CAMERA_ZOOM_CONTROLS"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
这是因为params
在代码中没有定义,因此编译器会抱怨。您可以在使用变量的地方声明变量,因此只需在变量名称前添加Camera.参数:
Camera.Parameters params = camera.getParameters();
或者-如果要在整个MainActivity中访问它,请将其放置在MainActivity中的摄影机声明下方:
Camera camera;
//add params
Camera.Parameters params;