在我的应用中，我有一个ListView用于列出一些文本视图和按钮，顶部还有ImageView，我在此之间添加了视差scrollview，现在我想添加一些textviews和按钮动态地在ListView中。我有这个代码;但它不起作用。我是初学者，所以我找不到实际的问题。任何人都可以帮助我，请原谅我的语言问题？
MainActivity.java
public class MainActivity extends Activity {
private int lastTop = 0;
//ImageView image;
ListView listView;
private static int RESULT_LOAD_IMAGE = 1;
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
ArrayAdapter adapter;
ArrayList<String> items = new ArrayList<>();
public void parallax(final View v) {
final Rect r = new Rect();
v.getLocalVisibleRect(r);
if (lastTop != r.top) {
lastTop = r.top;
v.post(new Runnable() {
@Override
public void run() {
v.setY((float) (r.top / 2.0));
}
});
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
//Dynamic textvieww
final LinearLayout lm = (LinearLayout) findViewById(R.id.linear);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
AbsListView.LayoutParams.WRAP_CONTENT, AbsListView.LayoutParams.WRAP_CONTENT);
//Create four
for(int j=0;j<=4;j++)
{
// Create LinearLayout
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.HORIZONTAL);
// Create TextView
TextView product = new TextView(this);
product.setText(" Product"+j+" ");
ll.addView(product);
// Create TextView
TextView price = new TextView(this);
price.setText(" $"+j+" ");
ll.addView(price);
// Create Button
final Button btn = new Button(this);
// Give button an ID
btn.setId(j+1);
btn.setText("Add To Cart");
// set the layoutParams on the button
btn.setLayoutParams(params);
final int index = j;
// Set click listener for button
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("TAG", "index :" + index);
Toast.makeText(getApplicationContext(),
"Clicked Button Index :" + index,
Toast.LENGTH_LONG).show();
}
});
//Add button to LinearLayout
ll.addView(btn);
//Add button to LinearLayout defined in XML
lm.addView(ll);
}
//EOF Dynamic
View view = getLayoutInflater().inflate(R.layout.header, null, false);
//Image view block
Button buttonLoadImage = (Button) view.findViewById(R.id.buttonLoadPicture);
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
this.imageView = (ImageView)view.findViewById(R.id.imgView);
Button photoButton = (Button) view.findViewById(R.id.button2);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
//imageview block end
// image = (ImageView) view.findViewById(R.id.image);
listView.addHeaderView(view);
adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, items);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
listView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
parallax(imageView);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
parallax(imageView);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
}
}
}
activity_main.xml中
<FrameLayout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="in.zoid.parallaxtutorial.MainActivity">
<LinearLayout
android:id="@+id/linear"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ListView
android:id="@+id/listView"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
</LinearLayout>
</FrameLayout>
header.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linear"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:id="@+id/imgView"
android:layout_width="wrap_content"
android:layout_height="200dip"
android:scaleType="centerCrop" ></ImageView>
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/black" >
<Button android:id="@+id/buttonLoadPicture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="Load Picture"
android:layout_gravity="center"></Button>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Take Picture"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</LinearLayout>