Java 非常慢的滚动、上下文菜单和按进程崩溃对话框
我对这个代码有很多问题 应用程序适配器Java 非常慢的滚动、上下文菜单和按进程崩溃对话框,java,android,xml,Java,Android,Xml,我对这个代码有很多问题 应用程序适配器 import java.util.List; import android.content.Context; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGro
import java.util.List;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ApplicationAdapter extends ArrayAdapter<ApplicationInfo> {
private List<ApplicationInfo> appsList = null;
private Context context;
private PackageManager packageManager;
public ApplicationAdapter(Context context, int textViewResourceId,
List<ApplicationInfo> appsList) {
super(context, textViewResourceId, appsList);
this.context = context;
this.appsList = appsList;
packageManager = context.getPackageManager();
}
@Override
public int getCount() {
return ((null != appsList) ? appsList.size() : 0);
}
@Override
public ApplicationInfo getItem(int position) {
return ((null != appsList) ? appsList.get(position) : null);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (null == view) {
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.snippet_list_row, null);
}
ApplicationInfo data = appsList.get(position);
if (null != data) {
TextView appName = (TextView) view.findViewById(R.id.app_name);
TextView packageName = (TextView) view.findViewById(R.id.app_paackage);
ImageView iconview = (ImageView) view.findViewById(R.id.app_icon);
appName.setText(data.loadLabel(packageManager));
packageName.setText(data.packageName);
iconview.setImageDrawable(data.loadIcon(packageManager));
}
return view;
}
};
import java.util.List;
导入android.content.Context;
导入android.content.pm.ApplicationInfo;
导入android.content.pm.PackageManager;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.ImageView;
导入android.widget.TextView;
公共类应用程序适配器扩展了ArrayAdapter{
私有列表appsList=null;
私人语境;
专用软件包管理器软件包管理器;
公共应用程序适配器(上下文,int textViewResourceId,
列表(应用列表){
超级(上下文、textViewResourceId、appsList);
this.context=上下文;
this.appsList=appsList;
packageManager=context.getPackageManager();
}
@凌驾
public int getCount(){
返回((null!=appsList)→appsList.size():0);
}
@凌驾
公共应用程序信息获取项(int位置){
return((null!=appsList)→appsList.get(position):null);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视图=转换视图;
if(null==视图){
LayoutInflater LayoutInflater=(LayoutInflater)上下文
.getSystemService(上下文布局\充气机\服务);
view=LayoutFlater.inflate(R.layout.snippet\u list\u行,空);
}
ApplicationInfo data=appsList.get(位置);
if(null!=数据){
TextView appName=(TextView)view.findViewById(R.id.app_name);
TextView packageName=(TextView)view.findViewById(R.id.app\u papackage);
ImageView图标视图=(ImageView)view.findViewById(R.id.app_图标);
appName.setText(data.loadLabel(packageManager));
packageName.setText(data.packageName);
iconview.setImageDrawable(data.loadIcon(packageManager));
}
返回视图;
}
};
主要活动
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Adapter;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.Button;
import android.widget.ListView;
public class MainActivity extends ListActivity {
private PackageManager packageManager = null;
private List<ApplicationInfo> applist = null;
private ApplicationAdapter listadaptor = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_eclair);
packageManager = getPackageManager();
new LoadApplications().execute();
Button bottone1 = (Button)findViewById(R.id.button1);
bottone1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
new LoadApplications().execute();
}
});};
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
ApplicationInfo app = applist.get(position);
/*
try {
Intent intent = packageManager
.getLaunchIntentForPackage(app.packageName);
if (null != intent) {
startActivity(intent);
}
} catch (ActivityNotFoundException e) {
Toast.makeText(Activity_Eclair.this, e.getMessage(),
Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(Activity_Eclair.this, e.getMessage(),
Toast.LENGTH_LONG).show();
}
*/
Uri packageUri = Uri.parse("package:"+app.packageName);
Intent uninstallIntent =
new Intent(Intent.ACTION_DELETE, packageUri);
startActivity(uninstallIntent);
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
for (ApplicationInfo info : list) {
try {
if (null != packageManager.getLaunchIntentForPackage(info.packageName)) {
applist.add(info);
}
} catch (Exception e) {
e.printStackTrace();
}
}
return applist;
}
private class LoadApplications extends AsyncTask<Void, Void, Void> {
public ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listadaptor = new ApplicationAdapter(Activity_Eclair.this,
R.layout.snippet_list_row, applist);
return null;
}
@Override
protected void onCancelled() {
super.onCancelled();
}
protected void onDestroy() {
if(progress!=null)
if(progress.isShowing()){
progress.dismiss();
}
}
@Override
protected void onPostExecute(Void result) {
setListAdapter(listadaptor);
progress.dismiss();
super.onPostExecute(result);
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(Activity_Eclair.this, null,
"Caricamento applicazioni in corso...");
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
}
import java.util.ArrayList;
导入java.util.List;
导入android.app.ListActivity;
导入android.app.ProgressDialog;
导入android.content.Intent;
导入android.content.pm.ApplicationInfo;
导入android.content.pm.PackageManager;
导入android.net.Uri;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.Adapter;
导入android.widget.AdapterView.AdapterContextMenuInfo;
导入android.widget.Button;
导入android.widget.ListView;
公共类MainActivity扩展了ListActivity{
私有PackageManager PackageManager=null;
私有列表applist=null;
私有应用程序适配器ListAdapter=null;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u eclair);
packageManager=getPackageManager();
新建LoadApplications().execute();
按钮bottone1=(按钮)findViewById(R.id.button1);
bottone1.setOnClickListener(新视图.OnClickListener(){
公共void onClick(视图v){
新建LoadApplications().execute();
}
});};
@凌驾
受保护的void onListItemClick(列表视图l、视图v、整数位置、长id){
super.onListItemClick(左、右、位置、id);
ApplicationInfo-app=applist.get(位置);
/*
试一试{
Intent=packageManager
.getLaunchIntentForPackage(app.packageName);
if(null!=intent){
星触觉(意向);
}
}捕获(ActivityNotFounde异常){
Toast.makeText(Activity_Eclair.this,e.getMessage(),
Toast.LENGTH_LONG).show();
}捕获(例外e){
Toast.makeText(Activity_Eclair.this,e.getMessage(),
Toast.LENGTH_LONG).show();
}
*/
Uri packageUri=Uri.parse(“包:“+app.packageName”);
意图卸载意图=
新意图(Intent.ACTION\u DELETE,packageUri);
星触觉(目的);
}
私人列表checkForLaunchIntent(列表列表){
ArrayList applist=新的ArrayList();
用于(应用程序信息:列表){
试一试{
if(null!=packageManager.getLaunchIntentForPackage(info.packageName)){
添加(信息);
}
}捕获(例外e){
e、 printStackTrace();
}
}
返回应用程序列表;
}
私有类LoadApplications扩展异步任务{
public ProgressDialog progress=null;
@凌驾
受保护的Void doInBackground(Void…参数){
applist=checkForLaunchIntent(packageManager.getInstalledApplications(packageManager.GET_META_DATA));
ListAdapter=新应用程序适配器(Activity\u Eclair.this,
R.layout.snippet\u list\u行,applist);
返回null;
}
@凌驾
受保护的void onCancelled(){
super.onCancelled();
}
受保护的空onDestroy(){
如果(进度!=null)
if(progress.isShowing()){
进步。解散();
}
}
@凌驾
受保护的void onPostExecute(void结果){
setListAdapter(ListAdapter);
进步。解散();
super.onPostExecute(结果);
}
@凌驾
受保护的void onPreExecute(){
progress=ProgressDialog.show(Activity\u Eclair.this,null,
“加共体在科索的应用……”;
super.onPreExecute();
}
@凌驾
受保护的void onProgressUpdate(void…值){
super.onProgressUpdate(值)