我有一个 gridView,如下所示:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_drag_and_drop_app"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<SlidingDrawer
android:id="@+id/bottom"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:orientation="horizontal"
android:layout_marginTop="200dp"
android:content="@+id/content"
android:handle="@+id/handle" >
<Button
android:id="@+id/handle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/arrow" />
<LinearLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#00FF00">
<!-- Editext for Search -->
<EditText android:id="@+id/inputSearch"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="@string/Search_applications"
android:inputType="textVisiblePassword"/>
<ListView
android:id="@+id/lvApps"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
</SlidingDrawer>
<Button
android:id="@+id/btnLinkToPersonalize"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:background="@null"
android:text="@string/Personalize"
android:textColor="#21dbd4"
android:textStyle="bold" />
<GridView
android:id="@+id/GRIDVIEW1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dip"
android:numColumns="auto_fit"
android:columnWidth="60dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:gravity="center"
android:stretchMode="columnWidth"
>
</GridView>
<ImageView
android:id="@+id/trash_can"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:contentDescription="@string/trashcanDescription_Delete"
android:padding="40dip"
android:src="@drawable/trashcan"
android:visibility="gone" >
</ImageView>
</RelativeLayout>
然后将我的 gridView 适配器放在一个单独的类中,如下所示:
package com.example.awesomefilebuilderwidget;
IMPORTS
public class GridView extends Activity { // implements OnItemLongClickListener, OnDragListener{
ArrayList<Integer> drawables = new ArrayList<Integer>();
private BaseAdapter adapter;
private int draggedIndex = -1;
android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.GRIDVIEW1);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drag_and_drop_app);
Log.d("GridView", "onCreate called");
drawables = new ArrayList<Integer>();
drawables.add(R.drawable.pattern1);
drawables.add(R.drawable.pattern2);
// gridView.setOnItemLongClickListener(this);
gridView.setAdapter(adapter = new BaseAdapter() {
@Override
// Get a View that displays the data at the specified position in
// the data set.
public View getView(int position, View convertView,
ViewGroup gridView) {
// try to reuse the views.
ImageView view = (ImageView) convertView;
// if convert view is null then create a new instance else reuse
// it
if (view == null) {
view = new ImageView(GridView.this);
}
/*Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("picture");
Bitmap default_b = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
view.setImageBitmap(default_b);*/
view.setImageResource(drawables.get(position));
view.setScaleType(ImageView.ScaleType.CENTER_CROP);
view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
view.setTag(String.valueOf(position));
return view;
}
@Override
// Get the row id associated with the specified position in the
// list.
public long getItemId(int position) {
return position;
}
@Override
// Get the data item associated with the specified position in the
// data set.
public Object getItem(int position) {
return drawables.get(position);
}
@Override
// How many items are in the data set represented by this Adapter.
public int getCount() {
return drawables.size();
}
});
}
/*@Override
public boolean onItemLongClick(AdapterView<?> gridView, View view,
int position, long row) {
ClipData.Item item = new ClipData.Item((String) view.getTag());
ClipData clipData = new ClipData((CharSequence) view.getTag(),
new String[] { ClipDescription.MIMETYPE_TEXT_PLAIN }, item);
view.startDrag(clipData, new View.DragShadowBuilder(view), null, 0);
View trashCan = findViewById(R.id.trash_can);
trashCan.setVisibility(View.VISIBLE);
trashCan.setOnDragListener(GridView.this);
trashCan.setOnDragListener(GridView.this);
draggedIndex = position;
return true;
}
@Override
public boolean onDrag(View view, DragEvent dragEvent) {
switch (dragEvent.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// Drag has started
// If called for trash resize the view and return true
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
return true;
} else // else check the mime type and set the view visibility
if (dragEvent.getClipDescription().hasMimeType(
ClipDescription.MIMETYPE_TEXT_PLAIN)) {
view.setVisibility(View.GONE);
return true;
} else {
return false;
}
case DragEvent.ACTION_DRAG_ENTERED:
// Drag has entered view bounds
// If called for trash can then scale it.
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.5f);
view.animate().scaleY(1.5f);
}
return true;
case DragEvent.ACTION_DRAG_EXITED:
// Drag exited view bounds
// If called for trash can then reset it.
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
}
view.invalidate();
return true;
case DragEvent.ACTION_DRAG_LOCATION:
// Ignore this event
return true;
case DragEvent.ACTION_DROP:
// Dropped inside view bounds
// If called for trash can then delete the item and reload the grid
// view
if (view.getId() == R.id.trash_can) {
drawables.remove(draggedIndex);
draggedIndex = -1;
}
adapter.notifyDataSetChanged();
case DragEvent.ACTION_DRAG_ENDED:
// Hide the trash can
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
findViewById(R.id.trash_can).setVisibility(View.GONE);
}
}, 1000l);
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
} else {
view.setVisibility(View.VISIBLE);
}
// remove drag listeners
view.setOnDragListener(null);
return true;
}
return false;
}*/
}
这个问题是我的 gridView 的 onCreate() 方法从未被调用,因此我的 gridView 根本不显示。我不知道为什么。我在 Manifest 中的所有编码都是正确的(据我所知),并且我尝试在我的 xml 文件上执行不同的高度和宽度以使我的 gridView 出现。无论我尝试了什么,我的 gridView 都不会出现。
顺便说一下,这是我的清单:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.awesomefilebuilderwidget"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name="com.example.awesomefilebuilderwidget.AFBWidget" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widget_stuff"/>
</receiver>
<activity android:name="com.example.awesomefilebuilderwidget.WidgetConfig" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
</intent-filter>
</activity>
<activity android:name="com.example.awesomefilebuilderwidget.Drag_and_Drop_App" android:label="@string/app_name" android:windowSoftInputMode="stateHidden" android:screenOrientation="portrait"></activity>
<activity android:name="com.example.awesomefilebuilderwidget.AppInfoAdapter" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Feedback" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SendMessageActivity" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Utilities" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.Personalize" android:label="@string/app_name" ></activity>
<activity android:name="com.example.awesomefilebuilderwidget.GridView" android:label="@string/app_name"></activity>
<activity android:name="com.example.awesomefilebuilderwidget.SwipeDetector" android:label="@string/app_name"></activity>
</application>
</manifest>
请帮忙!可能是什么问题?
编辑后添加:
这是我更新的类,因此我的适配器在它自己的类中...... GridView.java:
package com.example.awesomefilebuilderwidget;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.BaseAdapter;
public class GridView extends Activity {// implements OnItemLongClickListener, OnDragListener{
private int draggedIndex = -1;
private BaseAdapter adapter;
ArrayList<Integer> drawables = new ArrayList<Integer>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drag_and_drop_app);
Log.d("GridView", "onCreate called");
drawables.add(R.drawable.pattern1);
drawables.add(R.drawable.pattern2);
android.widget.GridView gridView = (android.widget.GridView) findViewById(R.id.GRIDVIEW1);
// Instance of Adapter Class
gridView.setAdapter(new GridViewAdapter(this));
// gridView.setOnItemLongClickListener(this);
}
/* @Override
public boolean onItemLongClick(AdapterView<?> gridView, View view,
int position, long row) {
ClipData.Item item = new ClipData.Item((String) view.getTag());
ClipData clipData = new ClipData((CharSequence) view.getTag(),
new String[] { ClipDescription.MIMETYPE_TEXT_PLAIN }, item);
view.startDrag(clipData, new View.DragShadowBuilder(view), null, 0);
View trashCan = findViewById(R.id.trash_can);
trashCan.setVisibility(View.VISIBLE);
trashCan.setOnDragListener(GridView.this);
trashCan.setOnDragListener(GridView.this);
draggedIndex = position;
return true;
}
@Override
public boolean onDrag(View view, DragEvent dragEvent) {
switch (dragEvent.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// Drag has started
// If called for trash resize the view and return true
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
return true;
} else // else check the mime type and set the view visibility
if (dragEvent.getClipDescription().hasMimeType(
ClipDescription.MIMETYPE_TEXT_PLAIN)) {
view.setVisibility(View.GONE);
return true;
} else {
return false;
}
case DragEvent.ACTION_DRAG_ENTERED:
// Drag has entered view bounds
// If called for trash can then scale it.
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.5f);
view.animate().scaleY(1.5f);
}
return true;
case DragEvent.ACTION_DRAG_EXITED:
// Drag exited view bounds
// If called for trash can then reset it.
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
}
view.invalidate();
return true;
case DragEvent.ACTION_DRAG_LOCATION:
// Ignore this event
return true;
case DragEvent.ACTION_DROP:
// Dropped inside view bounds
// If called for trash can then delete the item and reload the grid
// view
if (view.getId() == R.id.trash_can) {
drawables.remove(draggedIndex);
draggedIndex = -1;
}
adapter.notifyDataSetChanged();
case DragEvent.ACTION_DRAG_ENDED:
// Hide the trash can
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
findViewById(R.id.trash_can).setVisibility(View.GONE);
}
}, 1000l);
if (view.getId() == R.id.trash_can) {
view.animate().scaleX(1.0f);
view.animate().scaleY(1.0f);
} else {
view.setVisibility(View.VISIBLE);
}
// remove drag listeners
view.setOnDragListener(null);
return true;
}
return false;
}
*/
}
GridViewAdapter.java:
package com.example.awesomefilebuilderwidget;
import java.util.ArrayList;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class GridViewAdapter extends BaseAdapter {
private Context mContext;
// Keep all Images in array list
public ArrayList<Integer> drawables = new ArrayList<Integer>();
// Constructor
public GridViewAdapter(Context c){
mContext = c;
}
@Override
// How many items are in the data set represented by this Adapter
public int getCount() {
return drawables.size();
}
@Override
// Get the data item associated with the specified position in the
// data set
public Object getItem(int position) {
return drawables.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Try to reuse the views
ImageView view = (ImageView) convertView;
// if convert view is null then create a new instance else reuse it
if (view == null) {
view = new ImageView(mContext);
}
/*Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("picture");
Bitmap default_b = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
view.setImageBitmap(default_b);*/
view.setImageResource(drawables.get(position));
view.setScaleType(ImageView.ScaleType.CENTER_CROP);
view.setLayoutParams(new android.widget.GridView.LayoutParams(70, 70));
view.setTag(String.valueOf(position));
return view;
}
}
然后我还将这个活动添加到我的清单中:
<activity android:name="com.example.awesomefilebuilderwidget.GridView" android:label="@string/app_name" ></activity>
请注意,我的清单中没有 GridViewAdapter 作为活动