无法访问android中的视图
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【中文标题】无法访问android中的视图【英文标题】：Unable to access views in android 【发布时间】：2014-03-19 20:16:00 【问题描述】：我正在使用 metaio sdk。我试图在按下按钮时简单地切换两个图像视图的可见性，但它不起作用。
我的布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ma_layout"
android:layout_
android:layout_
android:background="#00000000" >
-----
<ImageView
android:id="@+id/zoomIcon"
android:layout_
android:layout_
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="4dp"
android:layout_marginRight="4dp"
android:background="@drawable/zooming"
android:onClick="seeZoom" />
<ImageView
android:id="@+id/scrollerBg"
android:layout_
android:layout_
android:layout_alignParentRight="true"
android:background="@drawable/scrollerbg"
android:visibility="invisible"/>
<ImageView
android:id="@+id/scroller"
android:layout_
android:layout_
android:layout_alignParentRight="true"
android:background="@drawable/scroller"
android:visibility="invisible"/>
---
</RelativeLayout>
我的代码：
import android.view.MotionEvent;
import java.util.List;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import com.metaio.sdk.jni.IGeometry;
import com.metaio.sdk.jni.IMetaiosDKAndroid;
import com.metaio.sdk.jni.Vector3d;
import android.os.Environment;
import com.metaio.sdk.ARViewActivity;
import com.metaio.sdk.jni.EPLAYBACK_STATUS;
import com.metaio.sdk.jni.IMetaioSDKCallback;
import com.metaio.sdk.jni.MovieTextureStatus;
import com.metaio.sdk.jni.Rotation;
import com.metaio.sdk.MetaioDebug;
import com.company.abc.R;
public class MainActivity extends ARViewActivity
public RelativeLayout mGUIView;
//public ImageView imgView1;
//public ImageView imgView2;
Camera camera;
private IGeometry tdp1, tdp2, tdp3, tdp4, tdp5, tdp6, tdp7, sal1, sal2;
boolean isTorchOn=false;
Parameters camParams;
public ImageView basePng;
public ImageView zoomIcon;
ImageView scroller;
public LayoutParams scrollerParams;
ImageView scrollerBg;
public LayoutParams scrollerBgParams;
boolean afc;
int counter;
int displayWidthbyTwo;
int displayHeightbyTwo;
int scrollerW;
int scrollerH;
int scrollerBgW;
int scrollerBgH;
int ZoomValue=0;
int maxZoomLevel;
int maxZoombyfour;
boolean zoomSupported;
boolean isZoomBarVisible=false;
private MetaioSDKCallbackHandler mCallbackHandler;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
MetaioDebug.enableLogging(true);
mCallbackHandler = new MetaioSDKCallbackHandler();
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
displayWidthbyTwo=metrics.widthPixels/2;
displayHeightbyTwo=metrics.heightPixels/2;
PackageManager PM= this.getPackageManager();
afc = PM.hasSystemFeature(PackageManager.FEATURE_CAMERA_AUTOFOCUS);
setContentView(R.layout.mainactivity);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
mGUIView = (RelativeLayout) getLayoutInflater().inflate(R.layout.mainactivity, null);
zoomIcon = (ImageView) mGUIView.findViewById(R.id.zoomIcon);
scroller = (ImageView) mGUIView.findViewById(R.id.scroller);
scrollerBg = (ImageView) mGUIView.findViewById(R.id.scrollerBg);
scroller.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
scrollerW = scroller.getMeasuredWidth()/2;
scrollerH = scroller.getMeasuredHeight()/2;
scrollerParams = (LayoutParams) scroller.getLayoutParams();
scrollerParams.topMargin = displayHeightbyTwo-150-scrollerH;
scroller.setLayoutParams(scrollerParams);
scrollerBg.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
scrollerBgW = scrollerBg.getMeasuredWidth()/2;
scrollerBgH = scrollerBg.getMeasuredHeight()/2;
scrollerBgParams = (LayoutParams) scrollerBg.getLayoutParams();
scrollerBgParams.topMargin = displayHeightbyTwo-scrollerBgH;
scrollerBg.setLayoutParams(scrollerBgParams);
scroller.setOnTouchListener(new View.OnTouchListener()
@Override
public boolean onTouch(View v, MotionEvent event)
LayoutParams layoutParams = (LayoutParams) scroller.getLayoutParams();
switch(event.getAction())
case MotionEvent.ACTION_MOVE:
//Get y coord of the touch point relative to screen
int y_cord = (int) event.getRawY();
//Restrict scroller bewtween center of screen +- 150
if(y_cord>(displayHeightbyTwo+150))
y_cord = displayHeightbyTwo+150;
if(y_cord<(displayHeightbyTwo-150))
y_cord = displayHeightbyTwo-150;
//Set zoom levels at various steps
if(y_cord<=displayHeightbyTwo-90)
camParams.setZoom(0);
Log.i("Zooming:","0");
ZoomValue=0;
if(y_cord<=displayHeightbyTwo-30 && y_cord>displayHeightbyTwo-90)
camParams.setZoom(maxZoombyfour);
Log.i("Zooming:","1");
ZoomValue=1;
if(y_cord<=displayHeightbyTwo+30 && y_cord>displayHeightbyTwo-30)
camParams.setZoom(maxZoombyfour*2);
Log.i("Zooming:","2");
ZoomValue=2;
if(y_cord<=displayHeightbyTwo+90 && y_cord>displayHeightbyTwo+30)
camParams.setZoom(maxZoombyfour*3);
Log.i("Zooming:","3");
ZoomValue=3;
if(y_cord>displayHeightbyTwo+90)
camParams.setZoom(maxZoomLevel);
Log.i("Zooming:","4");
ZoomValue=4;
camera.setParameters(camParams);
scrollerParams.topMargin = y_cord-scrollerH;
scroller.setLayoutParams(scrollerParams);
break;
default:
break;
return true;
);
@Override
protected int getGUILayout()
// TODO: return 0 in case of no GUI overlay
return R.layout.mainactivity;
@Override
protected void onStart()
super.onStart();
// hide GUI until SDK is ready
//if (!mRendererInitialized)
//mGUIView.setVisibility(View.GONE);
// add GUI layout
addContentView(mGUIView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
@Override
protected void loadContents()
// Load desired tracking data for planar marker tracking
String Path = "storage/sdcard1/AS/tdp/";
//final String trackingConfigFile = AssetsManager.getAssetPath("Tracking.xml");
boolean result = metaioSDK.setTrackingConfiguration(Path+"Tracking.xml");
String movie1Path = Path + "movie1.3gp";
tdp1 = metaioSDK.createGeometryFromMovie(movie1Path, false) ;
tdp1.setCoordinateSystemID(1);
tdp1.setScale(new Vector3d(4.0f,4.0f,4.0f));
tdp1.startMovieTexture(true); // loop = true;
@Override
protected void onGeometryTouched(IGeometry geometry)
// TODO Auto-generated method stub
@Override
public void onConfigurationChanged(Configuration newConfig)
super.onConfigurationChanged(newConfig);
@Override
public void onSurfaceChanged(int width, int height)
//always call the super implementation first
super.onSurfaceChanged(width, height);
camera=IMetaioSDKAndroid.getCamera(this);
camParams = camera.getParameters();
if(afc)
List<String> focusModes = camParams.getSupportedFocusModes();
if(focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE))
camParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
else if (focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
camParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
camera.setParameters(camParams);
if(camParams.isZoomSupported())
this.runOnUiThread(new Runnable()
public void run()
zoomIcon.setVisibility(View.VISIBLE);
);
maxZoomLevel = camParams.getMaxZoom();
maxZoombyfour = Math.round(maxZoomLevel/4);
zoomSupported=true;
@Override
protected IMetaioSDKCallback getMetaioSDKCallbackHandler()
return mCallbackHandler;
final class MetaioSDKCallbackHandler extends IMetaioSDKCallback
public void showTorch(View v)
if(isTorchOn)
IMetaioSDKAndroid.stopTorch(this);
isTorchOn=false;
else
IMetaioSDKAndroid.startTorch(this);
isTorchOn=true;
public void seeZoom(View v)
if(isZoomBarVisible)
scroller.setVisibility(0);
//scrollerBg.setVisibility(View.INVISIBLE);
isZoomBarVisible=false;
Log.i("ss","ss");
else
scroller.setVisibility(1);
isZoomBarVisible=true;
Log.i("ss","ss");
public void seeSettings(View v)
Intent intent = new Intent(this, Settings.class);
startActivity(intent);
//finish();
public void seeCatalog(View v)
Intent intent = new Intent(this, CatalogueActivity.class);
startActivity(intent);
//finish();
我从几个小时开始就尝试了多种方式，但它们都不起作用。请告诉我如何从 xml 访问视图。此代码以前可以使用，但现在无法使用。 Android 编程看起来真的很令人沮丧。
提前致谢
【问题讨论】：
按钮在哪里。你能把整个代码贴出来吗 嗨，我添加了按钮 发布整个代码。我看不到将膨胀的 xml 添加到活动的位置 添加了你好代码..请看..谢谢 【参考方案1】：你必须使用 setContent(R.layout.your_layout);在 onCreate 里面
像这样
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
//mGUIView = (RelativeLayout) getLayoutInflater().inflate(R.layout.scan, null);
setContent(R.layout.your_layout);
scroller = (ImageView) mGUIView.findViewById(R.id.scroller);
scrollerBg = (ImageView) mGUIView.findViewById(R.id.scrollerBg);
【讨论】：
【参考方案2】：我猜错误在'R'， 您需要做的就是导入您的包。R
例子
...
import com.yourpackage.yourappname.R; //Import this
@Override
public void onCreate(Bundle savedInstanceState)
MetaioCloudPlugin.startJunaio(null, getApplicationContext());
super.onCreate(savedInstanceState);
setContentView(R.layout.mainactivity);
...
那么它应该可以正常工作：D
【讨论】：
嗨，我已经有了那个导入语句..我使用的是 metaio sdk 而不是云插件..谢谢。还有更多建议 错误到底在哪一行？你可以通过logcat看到.. :D 任何地方都没有错误。 logcat 不显示任何内容。可见性切换不起作用 哦，然后贴出 main java 的每个代码以及您要具体隐藏哪两个图像？ 抱歉回复晚了...无论如何都可以删除 mGuiView 并仅使用 findviewbyid 进行实验...【参考方案3】：我之前遇到过同样的问题。我设法通过清除缓存、数据并从设备上卸载应用程序来解决它。在我将应用程序重新发布到测试设备后它正在工作。也许你可以试试。
【讨论】：
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