我尝试使用drawable文件夹中的图片创建自定义视图。 程序从文件夹中选择的图片取决于客户端，因此我需要使用变量来处理R文件。 在做了一项研究之后，我发现做到这一点的方法是这样的：
String uriName = ":drawable/"+thisCard.getKind()+thisCard.getNumber();
int idUri = getResources().getIdentifier(uriName , null , PACKAGE_NAME);
Drawable tmp = getResources().getDrawable(idUri , getContext().getTheme());
cardImage.setImageDrawable(tmp);
但是我得到了＆＃34;的运行时异常; android.content.res.Resources $ NotFoundException：资源ID＃0x0＆＃34;
当我搜索异常时，我得到的答案告诉我要做我在我写的段落中所做的事情。 我做错了什么？
另外，你可以在我添加的代码中看到我插入了一个Log命令进行调试。当我调试该行显示两次。当我只调用一次时，该方法调用两次是否有原因？
我添加了我的代码和堆栈跟踪。
这是该类的一部分（它扩展了View）
public void setCard(Card card){
thisCard = card;
isSet = true;
//in the Card constructor isSet is false so it does not suppose to go in the method setCardImage() yet.
invalidate();
}
private void setCardImage(){
String uriName = ":drawable/"+thisCard.getKind()+thisCard.getNumber();
try {
cardImage = (ImageView)findViewById(R.id.cardImage);
int idUri = getResources().getIdentifier(uriName , null , PACKAGE_NAME);
Drawable tmp = getResources().getDrawable(idUri , getContext().getTheme());
cardImage.setImageDrawable(tmp);
Log.d(TAG , "im here");
}catch(NullPointerException e){
e.printStackTrace();
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(isSet) {
setCardImage();
}
}
这是MainActivity：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
testView = (CardView)findViewById(R.id.testView);
Card card = new Card("club" , 2);
testView.setCard(card);
}
这就是StackTrace：
08-26 07:54:33.135 2364-2364/com.example.danac.cards E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.danac.cards, PID: 2364
android.content.res.Resources$NotFoundException: Resource ID #0x0
at android.content.res.Resources.getValue(Resources.java:1351)
at android.content.res.Resources.getDrawable(Resources.java:804)
at com.example.danac.cards.CardView.setCardImage(CardView.java:51)
at com.example.danac.cards.CardView.onDraw(CardView.java:65)
at android.view.View.draw(View.java:16178)
at android.view.View.updateDisplayListIfDirty(View.java:15174)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.draw(View.java:16181)
at android.view.View.updateDisplayListIfDirty(View.java:15174)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.updateDisplayListIfDirty(View.java:15169)
at android.view.View.draw(View.java:15948)
at android.view.ViewGroup.drawChild(ViewGroup.java:3609)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3399)
at android.view.View.draw(View.java:16181)
at com.android.internal.policy.PhoneWindow$DecorView.draw(PhoneWindow.java:2690)
at android.view.View.updateDisplayListIfDirty(View.java:15174)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2615)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2434)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2067)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
谢谢
编辑： 某个视图的xml：
<com.example.danac.cards.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/testView"/>
答案 0 :(得分：-1)
String uriName = ":drawable/"+thisCard.getKind()+thisCard.getNumber();
int idUri = getResources().getIdentifier(uriName , null , PACKAGE_NAME);
我猜你的uriName错了。你可以得到你的drawable id：
String drawableName = thisCard.getKind() + thisCard.getNumber();
int idDrawable = getResources().getIdentifier(drawableName, "drawable", PACKAGE_NAME);
您不应将＆＃34;：drawable＆＃34; 添加到您的可绘制名称中。您应该将＆＃34; drawable＆＃34; 添加到方法getIdentifier。祝你好运。