实例介绍
【实例截图】
【核心代码】
package com.example.sph.queryapp; import android.app.Activity; import android.app.Application; import android.content.Context; import android.content.pm.ApplicationInfo; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.text.Layout; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends Activity { private Button customAppbut = null; private Button systemAppbut = null; private Button deleteAppbut = null; private ListView listView = null; private List<ApplicationInfo> customerApps = null; private List<ApplicationInfo> systemApps =null; private Myadapter myadapter = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); customAppbut = (Button) findViewById(R.id.customer); systemAppbut = (Button) findViewById(R.id.button2); deleteAppbut = (Button) findViewById(R.id.button3); listView = (ListView) findViewById(R.id.listview); //加载系统app loadApp(); myadapter = new Myadapter(this,customerApps); listView.setAdapter(myadapter); customAppbut.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { updateList(customerApps); deleteAppbut.setText("可以卸载"); } }); systemAppbut.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { updateList(systemApps); deleteAppbut.setText("不可以卸载"); } }); } /** * */ public void loadApp(){ customerApps = new ArrayList<ApplicationInfo>(); systemApps = new ArrayList<ApplicationInfo>(); PackageManager pm = this.getPackageManager(); List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA); Toast.makeText(this, "packages =" packages.size(), Toast.LENGTH_LONG).show(); for (ApplicationInfo pi: packages){ if ((pi.flags&ApplicationInfo.FLAG_SYSTEM ) != 0){ systemApps.add(pi); Log.d("yzmyzm", "====systemApps=====" systemApps.size()); } else { customerApps.add(pi); Log.d("yzmyzm", "====customerApps=====" customerApps.size()); } } } /* private boolean isCustomer(ApplicationInfo info){ if ((info.flags&ApplicationInfo.FLAG_SYSTEM ) != 0){ return true; } return false; } */ /** * * * */ public void updateList(List<ApplicationInfo> apps) { myadapter.setDatas(apps); myadapter.notifyDataSetChanged(); } static class ViewHolder{ public ImageView appicon; public TextView appname; public TextView packagename; } class Myadapter extends BaseAdapter{ private LayoutInflater mInflater = null; private List<ApplicationInfo> apps; private Myadapter(Context context ,List<ApplicationInfo> apps){ this.mInflater = LayoutInflater.from(context); this.apps = apps; } public void setDatas(List<ApplicationInfo> apps){ this.apps = apps; } @Override public int getCount() { return customerApps.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null){ holder = new ViewHolder(); convertView = mInflater.inflate(R.layout.list_line,null); holder.appicon = (ImageView) convertView.findViewById(R.id.icon); holder.appname = (TextView) convertView.findViewById(R.id.appname); holder.packagename = (TextView) convertView.findViewById(R.id.packagename); convertView.setTag(holder); }else{ holder = (ViewHolder) convertView.getTag(); } PackageManager pm = getPackageManager(); ApplicationInfo info = apps.get(position); holder.appicon.setImageDrawable(pm.getApplicationIcon(info)); holder.appname.setText(pm.getApplicationLabel(info)); holder.packagename.setText(info.packageName); return convertView; } } }
标签: 实现查询系统中所有app
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