获得ClassCastException异常试图dyanmically插入RelativeLayout的时候? [英] Getting ClassCastException when trying to insert RelativeLayout dyanmically?
问题描述
的setContentView(R.layout.main2);
OUT =新的ArrayList< TextView的>();
llay =(RelativeLayout的)findViewById(R.id.displayPoll);
RelativeLayout.LayoutParams lparams =新RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
RelativeLayout.LayoutParams lparams1 =新RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
的LayoutParams LPAR =新的LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
Log.v(我的,rched);
out.add(新的TextView(本));
out.get(0).setLayoutParams(LPAR);
out.get(0).setId(1);
lparams1.addRule(RelativeLayout.ALIGN_BOTTOM,R.id.user_name);
llay.setLayoutParams(lparams1);
out.get(0).setText(标题+ 0 +\ñ\ñ\ñ\ñ\ñ\ N);
my_poll.this.llay.addView(out.get(0));
的for(int i = 1;我3;;我++)// mJsonArray.length();我++)
{
out.add(新的TextView(本));
out.get(我).setLayoutParams(LPAR);
out.get(ⅰ).setId第(i + 1);
Log.v(我的,哎+ out.get(I-1).getId());
lparams.addRule(RelativeLayout.BELOW,out.get第(i-1).getId());
llay.setLayoutParams(lparams);
out.get(我).setText(标题+ I +\ñ\ñ\ñ\ñ\ñ\ N);
llay.addView(out.get(ⅰ));
}
Log.v(我的,rasasched);
通过执行程序我收到此错误
04-06 20:30:49.372:E / AndroidRuntime(1093):致命异常:主要
04-06 20:30:49.372:E / AndroidRuntime(1093):java.lang.ClassCastException:android.widget.RelativeLayout $的LayoutParams
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.ScrollView.onMeasure(ScrollView.java:301)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.View.measure(View.java:8171)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.View.measure(View.java:8171)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.LinearLayout.measureVertical(LinearLayout.java:526)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.View.measure(View.java:8171)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.View.measure(View.java:8171)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.ViewRoot.performTraversals(ViewRoot.java:801)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.os.Handler.dispatchMessage(Handler.java:99)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.os.Looper.loop(Looper.java:123)
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.app.ActivityThread.main(ActivityThread.java:4627)
04-06 20:30:49.372:E / AndroidRuntime(1093):在java.lang.reflect.Method.invokeNative(本机方法)
04-06 20:30:49.372:E / AndroidRuntime(1093):在java.lang.reflect.Method.invoke(Method.java:521)
04-06 20:30:49.372:E / AndroidRuntime(1093):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
04-06 20:30:49.372:E / AndroidRuntime(1093):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-06 20:30:49.372:E / AndroidRuntime(1093):在dalvik.system.NativeStart.main(本机方法)
这是I M使用XML文件..
< RelativeLayout的
机器人:ID =@ + ID / displayPoll
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:背景=@可绘制/ back_blue_grad
机器人:填充=0dp>
<的TextView
机器人:ID =@ + ID /用户名
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentTop =真
机器人:layout_centerHorizontal =真
机器人:文本=Priyank Bharad
机器人:文字颜色=#FFF
机器人:TEXTSIZE =28dp
机器人:TEXTSTYLE =黑体/>
< ImageView的
机器人:ID =@ + ID / p_image
机器人:layout_width =35dp
机器人:layout_height =35dp
机器人:layout_marginRight =10dp
机器人:SRC =@可绘制/ final_fb
机器人:layout_toLeftOf =@用户名/用户名/>
< / RelativeLayout的>
< /滚动型>
这里的错误是在子类的LayoutParams
的选择。
正确的版本的LayoutParams
的实例取决于你正在创建的视图的父的不是类型查看本身
看看在logcat的转储:
04-06 20:30:49.372:E / AndroidRuntime(1093):java.lang.ClassCastException:android.widget.RelativeLayout $的LayoutParams
04-06 20:30:49.372:E / AndroidRuntime(1093):在android.widget.ScrollView.onMeasure(ScrollView.java:301)
Android正在试图强制转换的 RelativeLayout.LayoutParams
来,我相信应该是 ScrollView.LayoutParams
实例,因为你的 RelativeLayout的
是在滚动型
。
该修补程序应该是改变你使用的 RelativeLayout的
到 ScrollView.LayoutParams
。
setContentView(R.layout.main2);
out= new ArrayList<TextView>();
llay =(RelativeLayout) findViewById(R.id.displayPoll);
RelativeLayout.LayoutParams lparams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
RelativeLayout.LayoutParams lparams1 = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
LayoutParams lpar = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
Log.v("my","rched");
out.add(new TextView(this));
out.get(0).setLayoutParams(lpar);
out.get(0).setId(1);
lparams1.addRule(RelativeLayout.ALIGN_BOTTOM,R.id.user_name);
llay.setLayoutParams(lparams1);
out.get(0).setText("Title "+0+"\n\n\n\n\n\n");
my_poll.this.llay.addView(out.get(0));
for (int i = 1; i < 3;i++)//mJsonArray.length(); i++)
{
out.add(new TextView(this));
out.get(i).setLayoutParams(lpar);
out.get(i).setId(i+1);
Log.v("my","hey : "+out.get(i-1).getId());
lparams.addRule(RelativeLayout.BELOW,out.get(i-1).getId());
llay.setLayoutParams(lparams);
out.get(i).setText("Title "+i+"\n\n\n\n\n\n");
llay.addView(out.get(i));
}
Log.v("my","rasasched");
By executing the program I am getting this error
04-06 20:30:49.372: E/AndroidRuntime(1093): FATAL EXCEPTION: main
04-06 20:30:49.372: E/AndroidRuntime(1093): java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.ScrollView.onMeasure(ScrollView.java:301)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.View.measure(View.java:8171)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.View.measure(View.java:8171)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.LinearLayout.measureVertical(LinearLayout.java:526)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.View.measure(View.java:8171)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.View.measure(View.java:8171)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.os.Looper.loop(Looper.java:123)
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-06 20:30:49.372: E/AndroidRuntime(1093): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 20:30:49.372: E/AndroidRuntime(1093): at java.lang.reflect.Method.invoke(Method.java:521)
04-06 20:30:49.372: E/AndroidRuntime(1093): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-06 20:30:49.372: E/AndroidRuntime(1093): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-06 20:30:49.372: E/AndroidRuntime(1093): at dalvik.system.NativeStart.main(Native Method)
This is the XML file i m using..
<RelativeLayout
android:id="@+id/displayPoll"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/back_blue_grad"
android:padding="0dp" >
<TextView
android:id="@+id/user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Priyank Bharad"
android:textColor="#fff"
android:textSize="28dp"
android:textStyle="bold" />
<ImageView
android:id="@+id/p_image"
android:layout_width="35dp"
android:layout_height="35dp"
android:layout_marginRight="10dp"
android:src="@drawable/final_fb"
android:layout_toLeftOf="@id/user_name"/>
</RelativeLayout>
</ScrollView>
The mistake here is in the choice of the subclass of LayoutParams
.
The correct version of LayoutParams
to instantiate depends on the parent of the view you're creating, not the type of the view itself.
Take a look at the logcat dump:
04-06 20:30:49.372: E/AndroidRuntime(1093): java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams
04-06 20:30:49.372: E/AndroidRuntime(1093): at android.widget.ScrollView.onMeasure(ScrollView.java:301)
Android is trying to typecast the instance of RelativeLayout.LayoutParams
to, what I believe should be ScrollView.LayoutParams
, because your RelativeLayout
is inside of a ScrollView
.
The fix should be to change the layout params type that you're using on the RelativeLayout
to ScrollView.LayoutParams
.
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