Android获取手机最近任务列表

</pre><p class="p1"><span class="s1"></span></p><p class="p1"><span class="s1">因为朋友问我如何获取Android手机的最近任务 ，所以就在下面直接贴代码了，。希望能对用的上的人有帮助。主要就是2个类</span></p><p class="p1"><span class="s1"></span></p><p class="p1"><span class="s1">AppAdapter.java</span></p><p class="p1"><span class="s1"></span><pre name="code" class="java">package com.kale.appinfo;import java.util.HashMap;import java.util.List;import android.app.ActivityManager;import android.content.ActivityNotFoundException;import android.content.Context;import android.content.Intent;import android.database.DataSetObserver;import android.graphics.drawable.Drawable;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.ListAdapter;import android.widget.TextView;import android.widget.Toast;public class AppAdapter implements ListAdapter{List<HashMap<String,Object>> appInfos;Context mContext;public AppAdapter(Context mContext,List<HashMap<String,Object>> appInfos) {this.appInfos = appInfos;this.mContext = mContext;}@Overridepublic void registerDataSetObserver(DataSetObserver observer) {}@Overridepublic void unregisterDataSetObserver(DataSetObserver observer) {}@Overridepublic int getCount() {return appInfos.size();}@Overridepublic Object getItem(int position) {return appInfos.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic boolean hasStableIds() {return false;}/** * 自定义view */@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {LayoutInflater mInflater = LayoutInflater.from(mContext);View infoView = mInflater.inflate(R.layout.item, null);ImageView mImageView = (ImageView) infoView.findViewById(R.id.icon);TextView mTextView = (TextView) infoView.findViewById(R.id.title);TextView indexTv = (TextView)infoView.findViewById(R.id.index);Button clostBtn = (Button)infoView.findViewById(R.id.close);String title = (String) appInfos.get(position).get("title");Drawable icon = (Drawable) appInfos.get(position).get("icon");Intent singleIntent = (Intent) appInfos.get(position).get("tag");final String packageName = (String) appInfos.get(position).get("packageName");infoView.setTag(singleIntent);mImageView.setImageDrawable(icon);mTextView.setText(title);indexTv.setText(String.valueOf(position+1));clostBtn.setOnClickListener(new OnClickListener() {//根据包名来清除应用进程@Overridepublic void onClick(View v) {ActivityManager mAm;mAm = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); mAm.killBackgroundProcesses(packageName);Toast.makeText(mContext, "已清除进程的包名为："+packageName, 0).show();}});//绑定点击事件，用来进行应用间的跳转infoView.setOnClickListener(new SingleAppClickListener());return infoView;}@Overridepublic int getItemViewType(int position) {return 0;}@Overridepublic int getViewTypeCount() {return 1;}@Overridepublic boolean isEmpty() {return false;}@Overridepublic boolean areAllItemsEnabled() {return false;}@Overridepublic boolean isEnabled(int position) {return false;}//点击应用的图标启动应用程序class SingleAppClickListener implements View.OnClickListener{@Overridepublic void onClick(View v) {Intent intent = (Intent)v.getTag();        if (intent != null) {            intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);            try {            mContext.startActivity(intent);            }             catch (ActivityNotFoundException e) {                Log.w("Recent", "Unable to launch recent task", e);            }        }}}}

MainActivity.java

package com.kale.appinfo;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import android.app.Activity;import android.app.ActivityManager;import android.content.Context;import android.content.Intent;import android.content.pm.ActivityInfo;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.ListView;public class MainActivity extends Activity {    private ListView list;        //用来存放每一个recentApplication的信息，我们这里存放应用程序名，应用程序图标和intent。    private List<HashMap<String,Object>> appInfos = new ArrayList<HashMap<String, Object>>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);list = (ListView)findViewById(R.id.listView);//设定显示的最大的任务数为20reloadButtons(this, appInfos, 20);list.setAdapter(new AppAdapter(this, appInfos));}/** * 核心方法，加载最近启动的应用程序 注意：这里我们取出的最近任务为 MAX_RECENT_TASKS + * 1个，因为有可能最近任务中包好Launcher2。 这样可以保证我们展示出来的 最近任务 为 MAX_RECENT_TASKS 个 * 通过以下步骤，可以获得近期任务列表，并将其存放在了appInfos这个list中，接下来就是展示这个list的工作了。 */public static void reloadButtons(Activity activity,List<HashMap<String, Object>> appInfos,int appNumber) {int MAX_RECENT_TASKS = appNumber; // allow for some discardsint repeatCount = appNumber;// 保证上面两个值相等,设定存放的程序个数/* 每次加载必须清空list中的内容 */appInfos.removeAll(appInfos);// 得到包管理器和activity管理器final Context context = activity.getApplication();final PackageManager pm = context.getPackageManager();final ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);// 从ActivityManager中取出用户最近launch过的 MAX_RECENT_TASKS + 1 个，以从早到晚的时间排序，// 注意这个 0x0002,它的值在launcher中是用ActivityManager.RECENT_IGNORE_UNAVAILABLE// 但是这是一个隐藏域，因此我把它的值直接拷贝到这里final List<ActivityManager.RecentTaskInfo> recentTasks = am.getRecentTasks(MAX_RECENT_TASKS + 1, 0x0002);// 这个activity的信息是我们的launcherActivityInfo homeInfo = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME).resolveActivityInfo(pm, 0);int numTasks = recentTasks.size();for (int i = 0; i < numTasks && (i < MAX_RECENT_TASKS); i++) {HashMap<String, Object> singleAppInfo = new HashMap<String, Object>();// 当个启动过的应用程序的信息final ActivityManager.RecentTaskInfo info = recentTasks.get(i);Intent intent = new Intent(info.baseIntent);if (info.origActivity != null) {intent.setComponent(info.origActivity);}/** * 如果找到是launcher，直接continue，后面的appInfos.add操作就不会发生了 */if (homeInfo != null) {if (homeInfo.packageName.equals(intent.getComponent().getPackageName())&& homeInfo.name.equals(intent.getComponent().getClassName())) {MAX_RECENT_TASKS = MAX_RECENT_TASKS + 1;continue;}}// 设置intent的启动方式为 创建新task()【并不一定会创建】intent.setFlags((intent.getFlags() & ~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)| Intent.FLAG_ACTIVITY_NEW_TASK);// 获取指定应用程序activity的信息(按我的理解是：某一个应用程序的最后一个在前台出现过的activity。)final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);if (resolveInfo != null) {final ActivityInfo activityInfo = resolveInfo.activityInfo;final String title = activityInfo.loadLabel(pm).toString();Drawable icon = activityInfo.loadIcon(pm);if (title != null && title.length() > 0 && icon != null) {singleAppInfo.put("title", title);singleAppInfo.put("icon", icon);singleAppInfo.put("tag", intent);singleAppInfo.put("packageName", activityInfo.packageName);appInfos.add(singleAppInfo);}}}MAX_RECENT_TASKS = repeatCount;}    }