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所有人。这是来自youtube api演示的代码。我只是想自定义列表视图，而不是显示一个文本，我想在文本之前为listview中的每个项目添加一个特定的图像。澄清，出现“显示我的频道”...“我的播放列表1”....它应该出现在这些文本之前点击它。ImageView，更改DemoArrayAdapter以显示图像
我知道我应该修改DemoArrayAdapter上的getview（）。但是如何？我是新手。这就是为什么我会把DemoArrayAdapter.Java的代码下面
IntentDemoActivity.Java
package com.examples.youtubeapidemo;
import com.google.android.youtube.player.YouTubeIntents;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import com.examples.youtubeapidemo.adapter.DemoArrayAdapter;
import com.examples.youtubeapidemo.adapter.DemoListViewItem;
import java.util.ArrayList;
import java.util.List;
/**
* A sample activity which shows how to use the {@link YouTubeIntents} static methods to create
* Intents that navigate the user to Activities within the main YouTube application.
*/
public final class IntentsDemoActivity extends Activity implements OnItemClickListener {
// This is the value of Intent.EXTRA_LOCAL_ONLY for API level 11 and above.
private static final String EXTRA_LOCAL_ONLY = "android.intent.extra.LOCAL_ONLY";
private static final String VIDEO_ID = "tKIISemrwJ8";
private static final String PLAYLIST_ID = "PL75F25C99BA786497";
private static final String PLAYLIST_ID2 = "PL75F25C99BA786497";
private static final String USER_ID = "felipeneto";
private static final int SELECT_VIDEO_REQUEST = 1000;
private List<DemoListViewItem> intentItems;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.intents_demo);
intentItems = new ArrayList<DemoListViewItem>();
intentItems.add(new IntentItem("Show My Channel", IntentType.OPEN_USER));
intentItems.add(new IntentItem("My Playlist 1", IntentType.OPEN_PLAYLIST));
intentItems.add(new IntentItem("My Playlist 2", IntentType.OPEN_PLAYLIST2));
intentItems.add(new IntentItem("Featured", IntentType.PLAY_VIDEO));
intentItems.add(new IntentItem("Search", IntentType.OPEN_SEARCH));
ListView listView = (ListView) findViewById(R.id.intent_list);
DemoArrayAdapter adapter =
new DemoArrayAdapter(this, R.layout.list_item, intentItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
TextView youTubeVersionText = (TextView) findViewById(R.id.youtube_version_text);
String version = YouTubeIntents.getInstalledYouTubeVersionName(this);
if (version != null) {
String text = String.format(getString(R.string.youtube_currently_installed), version);
youTubeVersionText.setText(text);
} else {
youTubeVersionText.setText(getString(R.string.youtube_not_installed));
}
}
public boolean isIntentTypeEnabled(IntentType type) {
switch (type) {
case PLAY_VIDEO:
return YouTubeIntents.canResolvePlayVideoIntent(this);
case OPEN_PLAYLIST:
return YouTubeIntents.canResolveOpenPlaylistIntent(this);
case OPEN_PLAYLIST2:
return YouTubeIntents.canResolveOpenPlaylistIntent(this);
case PLAY_PLAYLIST:
return YouTubeIntents.canResolvePlayPlaylistIntent(this);
case OPEN_SEARCH:
return YouTubeIntents.canResolveSearchIntent(this);
case OPEN_USER:
return YouTubeIntents.canResolveUserIntent(this);
}
return false;
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
IntentItem clickedIntentItem = (IntentItem) intentItems.get(position);
Intent intent;
switch (clickedIntentItem.type) {
case PLAY_VIDEO:
intent = YouTubeIntents.createPlayVideoIntentWithOptions(this, VIDEO_ID, true, false);
startActivity(intent);
break;
case OPEN_PLAYLIST:
intent = YouTubeIntents.createOpenPlaylistIntent(this, PLAYLIST_ID);
startActivity(intent);
break;
case OPEN_PLAYLIST2:
intent = YouTubeIntents.createOpenPlaylistIntent(this, PLAYLIST_ID2);
startActivity(intent);
break;
case PLAY_PLAYLIST:
intent = YouTubeIntents.createPlayPlaylistIntent(this, PLAYLIST_ID);
startActivity(intent);
break;
case OPEN_SEARCH:
intent = YouTubeIntents.createSearchIntent(this, USER_ID);
startActivity(intent);
break;
case OPEN_USER:
intent = YouTubeIntents.createUserIntent(this, USER_ID);
startActivity(intent);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent returnedIntent) {
if (resultCode == RESULT_OK) {
switch (requestCode) {
case SELECT_VIDEO_REQUEST:
Intent intent = YouTubeIntents.createUploadIntent(this, returnedIntent.getData());
startActivity(intent);
break;
}
}
super.onActivityResult(requestCode, resultCode, returnedIntent);
}
private enum IntentType {
PLAY_VIDEO,
OPEN_PLAYLIST,
OPEN_PLAYLIST2,
PLAY_PLAYLIST,
OPEN_USER,
OPEN_SEARCH,
}
private final class IntentItem implements DemoListViewItem {
public final String title;
public final IntentType type;
public IntentItem(String title, IntentType type) {
this.title = title;
this.type = type;
}
public String getTitle() {
return title;
}
public boolean isEnabled() {
return isIntentTypeEnabled(type);
}
public String getDisabledText() {
return getString(R.string.intent_disabled);
}
}
}
DemoArrayAdapter.java。举一个例子，我应该修改或放到我想要的位置（每个项目的图像不同）。
package com.examples.youtubeapidemo.adapter;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.examples.youtubeapidemo.R;
import java.util.List;
/**
* A convenience class to make ListViews easier to use in the demo activities.
*/
public final class DemoArrayAdapter extends ArrayAdapter<DemoListViewItem> {
private final LayoutInflater inflater;
public DemoArrayAdapter(Context context, int textViewResourceId, List<DemoListViewItem> objects) {
super(context, textViewResourceId, objects);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null) {
view = inflater.inflate(R.layout.list_item, null);
}
TextView textView = (TextView) view.findViewById(R.id.list_item_text);
textView.setText(getItem(position).getTitle());
TextView disabledText = (TextView) view.findViewById(R.id.list_item_disabled_text);
disabledText.setText(getItem(position).getDisabledText());
if (isEnabled(position)) {
disabledText.setVisibility(View.INVISIBLE);
textView.setTextColor(Color.WHITE);
} else {
disabledText.setVisibility(View.VISIBLE);
textView.setTextColor(Color.GRAY);
}
return view;
}
@Override
public boolean areAllItemsEnabled() {
// have to return true here otherwise disabled items won't show a divider in the list.
return true;
}
@Override
public boolean isEnabled(int position) {
return getItem(position).isEnabled();
}
public boolean anyDisabled() {
for (int i = 0; i < getCount(); i++) {
if (!isEnabled(i)) {
return true;
}
}
return false;
}
}