Android 网格视图下的文本视图
如何在网格视图中的图像下添加文本视图? 我得到了这个代码,但当我启动应用程序时,它崩溃了Android 网格视图下的文本视图,android,gridview,crash,textview,Android,Gridview,Crash,Textview,如何在网格视图中的图像下添加文本视图? 我得到了这个代码,但当我启动应用程序时,它崩溃了 public class ImageAdapter extends BaseAdapter { private Context mContext; TextView text; private String[] mThumbTxt = { "Some text view 1", "Some text view 2", "Some text view 3", "
public class ImageAdapter extends BaseAdapter {
private Context mContext;
TextView text;
private String[] mThumbTxt = {
"Some text view 1", "Some text view 2", "Some text view 3", " Some text view 4"
};
public Integer[] mThumbIds = {
R.drawable.img1, R.drawable.img2,
R.drawable.img3, R.drawable.img4,
R.drawable.img5, R.drawable.img6,
R.drawable.img7, R.drawable.img20,
R.drawable.img8, R.drawable.img21,
R.drawable.img9, R.drawable.img22,
R.drawable.img10, R.drawable.img23,
R.drawable.img11, R.drawable.img24,
R.drawable.img12, R.drawable.img25,
R.drawable.img13, R.drawable.img26,
R.drawable.img14, R.drawable.img27,
R.drawable.img15, R.drawable.img28,
R.drawable.img16, R.drawable.img29,
R.drawable.img17, R.drawable.img30,
R.drawable.img18, R.drawable.img31,
R.drawable.img19,
};
// Constructor
public ImageAdapter(Context c){
mContext = c;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return mThumbIds[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mThumbIds[position]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new GridView.LayoutParams(270, 270));
text.setText(mThumbTxt[position]);
return imageView;
}
}
那么我需要做什么呢?在网格视图中创建文本视图?或者我可以用绳子?
用这段代码我得到了一个错误
03-04 11:53:50.188: W/dalvikvm(12926): threadid=1: thread exiting with uncaught exception (group=0x41aac8b0)
03-04 11:53:50.208: E/AndroidRuntime(12926): FATAL EXCEPTION: main
03-04 11:53:50.208: E/AndroidRuntime(12926): java.lang.NullPointerException
03-04 11:53:50.208: E/AndroidRuntime(12926): at gsoft.relaxingringtones.ImageAdapter.getView(ImageAdapter.java:64)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.AbsListView.obtainView(AbsListView.java:2181)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.GridView.onMeasure(GridView.java:1044)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.View.measure(View.java:16030)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.View.measure(View.java:16030)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.View.measure(View.java:16030)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.View.measure(View.java:16030)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.widget.FrameLayout.onMeasure(FrameLayout.java:314)
03-04 11:53:50.208: E/AndroidRuntime(12926): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2196)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.View.measure(View.java:16030)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1915)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1290)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1009)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5508)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.Choreographer.doFrame(Choreographer.java:532)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.os.Handler.handleCallback(Handler.java:730)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.os.Handler.dispatchMessage(Handler.java:92)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.os.Looper.loop(Looper.java:213)
03-04 11:53:50.208: E/AndroidRuntime(12926): at android.app.ActivityThread.main(ActivityThread.java:5225)
03-04 11:53:50.208: E/AndroidRuntime(12926): at java.lang.reflect.Method.invokeNative(Native Method)
03-04 11:53:50.208: E/AndroidRuntime(12926): at java.lang.reflect.Method.invoke(Method.java:525)
03-04 11:53:50.208: E/AndroidRuntime(12926): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
03-04 11:53:50.208: E/AndroidRuntime(12926): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
03-04 11:53:50.208: E/AndroidRuntime(12926): at dalvik.system.NativeStart.main(Native Method)
我认为您应该在使用之前在getView方法中初始化textview
text = new TextView(this);
text.setText(mThumbTxt[position]);
添加textview后,您必须返回linearlayout或RelativeLayout类型的视图以显示图像和文本。我认为您应该在使用之前在getView方法中初始化textview
text = new TextView(this);
text.setText(mThumbTxt[position]);
添加文本视图后,您必须返回linearlayout或RelativeLayout类型的视图以显示图像和文本。您需要为您的
textview
添加findViewById
或动态添加textview
text.setText(mThumbTxt[position]);
代码不知道在哪里设置该文本,您的“
文本
”在哪里您需要为您的文本视图
添加一个findViewById
,或者动态添加一个文本视图
text.setText(mThumbTxt[position]);
代码不知道在何处设置该文本,其中“文本”
“是”请从mThumbIds中的最后一个位置删除逗号“
”
改变它
public Integer[] mThumbIds = {
R.drawable.img1, R.drawable.img2,
....................................
R.drawable.img18, R.drawable.img31,
R.drawable.img19, <---- remove comma from here.
};
始终确保mThumbTxt
的大小必须与mThumbIds
相同,否则它将抛出索引自动边界错误。从mThumbIds
中的最后一个位置删除逗号,“
”
改变它
public Integer[] mThumbIds = {
R.drawable.img1, R.drawable.img2,
....................................
R.drawable.img18, R.drawable.img31,
R.drawable.img19, <---- remove comma from here.
};
始终确保
mThumbTxt
的大小必须与mThumbIds
相同,否则它将抛出IndexOutOfBounds错误。使用本教程时应单独提问:为什么要获得npe,以及如何更改布局。虽然更改布局可能会神奇地使npe消失,但这两者并不真正相关。@Sabroan请查看我的答案。使用本教程时,您应该分别提问:为什么要获得npe,以及如何更改布局。虽然改变布局可能会神奇地使npe消失,但这两者并没有真正的联系。@Sabroan看看我的答案。