分享Android开源项目AnyCat(4)

获取系统中的可应用程序的列表  ActivityPickerActivity.java

/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.example.anycut;

import java.util.ArrayList;

import java.util.Collections;
import java.util.List;

import Android.app.Activity;
import android.app.ListActivity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.google.android.photostream.UserTask;

/**
* Presents a list of activities to choose from. This list only contains activities
* that have ACTION_MAIN, since other types may require data as input.
*/
public class ActivityPickerActivity extends ListActivity {
PackageManager mPackageManager;

/**
* This class is used to wrap ResolveInfo so that it can be filtered using
* ArrayAdapter's built int filtering logic, which depends on toString().
*/
private final class ResolveInfoWrapper {
private ResolveInfo mInfo;

public ResolveInfoWrapper(ResolveInfo info) {
mInfo = info;
}

@Override
public String toString() {
return mInfo.loadLabel(mPackageManager).toString();
}

public ResolveInfo getInfo() {
return mInfo;
}
}

//设置List布局
private class ActivityAdapter extends ArrayAdapter<ResolveInfoWrapper> {
LayoutInflater mInflater;

public ActivityAdapter(Activity activity, ArrayList<ResolveInfoWrapper> activities) {
super(activity, 0, activities);
mInflater = activity.getLayoutInflater();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ResolveInfoWrapper info = getItem(position);

View view = convertView;
if (view == null) {
// Inflate the view and cache the pointer to the text view
view = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false);
view.setTag(view.findViewById(android.R.id.text1));
}

final TextView textView = (TextView) view.getTag();
textView.setText(info.getInfo().loadLabel(mPackageManager));

return view;
}
}

/**
*

* @Title: ActivityPickerActivity.java  核心块
* @Package com.example.anycut
* @ClassName: LoadingTask
* @Description：
* @author：ppwuyi@sohu.com,wujun@cqghong.com
* @date ：2010-9-13 上午11:43:45       
* 修改备注：
* @version 1.0
*/
private final class LoadingTask extends UserTask<Object, Object, ActivityAdapter> {
@Override
public void onPreExecute() {
setProgressBarIndeterminateVisibility(true); //设置精度圈圈可见
}

@Override
public ActivityAdapter doInBackground(Object... params) { //工作
// Load the activities
Intent queryIntent = new Intent(Intent.ACTION_MAIN); //地址
List<ResolveInfo> list = mPackageManager.queryIntentActivities(queryIntent, 0); //返回符合 地址要求的列表

// Sort the list
Collections.sort(list, new ResolveInfo.DisplayNameComparator(mPackageManager)); //对地址排序

// Make the wrappers
ArrayList<ResolveInfoWrapper> activities = new ArrayList<ResolveInfoWrapper>(list.size());
for(ResolveInfo item : list) {
activities.add(new ResolveInfoWrapper(item)); //加载在list
}
return new ActivityAdapter(ActivityPickerActivity.this, activities);
}

@Override
public void onPostExecute(ActivityAdapter result) {
setProgressBarIndeterminateVisibility(false); //取消圈圈
setListAdapter(result); //设置舍弃器为 result
}
}

@Override
protected void onCreate(Bundle savedState) {
super.onCreate(savedState);

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.list);

getListView().setTextFilterEnabled(true);//是否开始键盘过滤器

mPackageManager = getPackageManager();//获取包

// Start loading the data
new LoadingTask().execute((Object[]) null); //将读取列表添加到界面
}

@Override
protected void onListItemClick(ListView list, View view, int position, long id) {
ResolveInfoWrapper wrapper = (ResolveInfoWrapper) getListAdapter().getItem(position);
ResolveInfo info = wrapper.getInfo();  //获取点击对象的信息

// Build the intent for the chosen activity
Intent intent = new Intent();//准备
intent.setComponent(new ComponentName(info.activityInfo.applicationInfo.packageName,
info.activityInfo.name));  //这是核心
Intent result = new Intent();
result.putExtra(Intent.EXTRA_SHORTCUT_INTENT, intent); //---------------加载进去

// Set the name of the activity
result.putExtra(Intent.EXTRA_SHORTCUT_NAME, info.loadLabel(mPackageManager));//------------获取名字 地址路径

// Build the icon info for the activity
Drawable drawable = info.loadIcon(mPackageManager); //---------------------------读取程序图标
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bd = (BitmapDrawable) drawable;
result.putExtra(Intent.EXTRA_SHORTCUT_ICON, bd.getBitmap());//----------------加载进去
}
//        ShortcutIconResource iconResource = new ShortcutIconResource();
//        iconResource.packageName = info.activityInfo.packageName;
//        iconResource.resourceName = getResources().getResourceEntryName(info.getIconResource());
//        result.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconResource);

// Set the result
setResult(RESULT_OK, result);
finish();
}
}