为什么图标不显示，但图标的名称正在写入列表

Question

我有一个代码来显示我的设备中安装的所有应用程序...它的工作正常，但现在我只想显示阿拉伯图标应用程序，而不是显示图标，图标的名称被写入列表中。像

android.graphics.drawable.BitmapDrawable@405369f0 

怎么办？ 这是我的代码

private ArrayList<String> application_name = new ArrayList<String>(); 
private ArrayList<Drawable> application_icon = new ArrayList<Drawable>(); 
PackageInfo pInfo; 
String packageName; 
String app; 
List<ResolveInfo> list; 
TextView apple; 
String myapps_name[]= new String[application_name.size()]; 
Drawable myapps_icon[]= new Drawable[application_icon.size()]; 
ResolveInfo rInfo; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    //setContentView(R.layout.activity_main); 

    //lView = (ListView) findViewById(R.id.list); 
    PackageManager pm = this.getPackageManager(); 

    Intent intent = new Intent(Intent.ACTION_MAIN, null); 
    intent.addCategory(Intent.CATEGORY_LAUNCHER); 

    list = pm.queryIntentActivities(intent, PackageManager.PERMISSION_GRANTED); 
    for (ResolveInfo rInfo: list) 
    { 
     application_name.add((String) rInfo.activityInfo.applicationInfo.loadLabel(pm)); 
     application_icon.add(rInfo.activityInfo.applicationInfo.loadIcon(pm)); 

     Log.w("Installed Applications", rInfo.activityInfo.applicationInfo.loadLabel(pm).toString()); 
    } 
    getListView().setOnItemClickListener(this); 

    myapps_name = application_name.toArray(myapps_name); 
    myapps_icon=application_icon.toArray(myapps_icon); 

    setListAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, myapps_icon)); 
} 

@Override 
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
    // 
    final Intent intent = new Intent(Intent.ACTION_MAIN); 
    final ActivityInfo info = list.get(arg2).activityInfo; 
    intent.setClassName(info.packageName, info.name); 
    // intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); 
    startActivity(intent); 
} 

而且如果可能的话我想显示既为每个已安装的应用程序

Answer 1

的图标和应用程序名称，以达到你想要什么，你有子类，在你的情况下，ArrayAdapter并覆盖getView方法。事实上，getView负责返回您想要显示的视图。

Answer 2

以下是您需要知道的信息。检查这个out。您可以查看Android的所有默认布局。您正在访问的那个android.R.layout.simple_list_item_1包含TextView。所以显然这个图标不会被显示出来。看看source code。

所以要得到你想要的东西，你需要使用一个自定义的适配器并将它设置到你的列表中。以下是我的一个应用程序的示例。它列出了icon,application name,package name。另外，我建议你使用AsyncTask来生成列表。

row.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_margin="3dp" 
android:padding="6dip" > 

<ImageView 
    android:id="@+id/iconView" 
    android:layout_width="64dp" 
    android:layout_height="64dp" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:src="@drawable/ic_launcher" /> 

<TextView 
    android:id="@+id/appName" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignTop="@+id/iconView" 
    android:layout_toRightOf="@+id/iconView" 
    android:layout_marginLeft="3dp" 
    android:text="Application name" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<TextView 
    android:id="@+id/packageName" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignLeft="@+id/appName" 
    android:layout_below="@+id/appName" 
    android:text="Package name" 
    android:textSize="12sp" 
    android:layout_marginLeft="3dp" 
    android:textAppearance="?android:attr/textAppearanceSmall" /> 

<TextView 
    android:id="@+id/versionName" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignLeft="@+id/packageName" 
    android:layout_below="@+id/packageName" 
    android:textSize="12sp" 
    android:text="Version Name" 
    android:textAppearance="?android:attr/textAppearanceSmall" /> 
<TextView 
    android:id="@+id/versionCode" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/packageName" 
    android:layout_toRightOf="@+id/versionName" 
    android:textSize="12sp" 
    android:text="Version Code" 
    android:layout_marginLeft="3dp" 
    android:textAppearance="?android:attr/textAppearanceSmall" /> 

activity_app_list.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context=".AppList" > 

<ListView 
    android:id="@+id/listView1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" > 
</ListView> 

AppList.java

package com.torcellite.de_addiction; 

import java.util.ArrayList; 
import java.util.List; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.content.pm.ApplicationInfo; 
import android.content.pm.PackageInfo; 
import android.graphics.drawable.Drawable; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 

public class AppList extends Activity { 

private static ListView lView; 
private static String appnames[], pnames[], versionnames[]; 
private static int versionCodes[]; 
private static Drawable icons[]; 
private static AppAdapter adapter; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_app_list); 
    lView = (ListView) findViewById(R.id.listView1); 
    new loadApps().execute(); 
} 

class loadApps extends AsyncTask<Void, Void, Void> 
{ 
    private ProgressDialog pd; 
    @Override 
    protected Void doInBackground(Void... arg0) { 
     // TODO Auto-generated method stub 
     getPackages(); 
     return null; 
    } 

    @Override 
    protected void onPreExecute() 
    { 
     pd = new ProgressDialog(AppList.this); 
     pd.setIndeterminate(true); 
     pd.setCancelable(false); 
     pd.setMessage("Loading applications.."); 
     pd.show(); 
    } 

    @Override 
    protected void onPostExecute(Void result) 
    { 
     pd.dismiss(); 
     lView.setAdapter(adapter); 
    } 
} 
class PInfo { 
    private String appname = ""; 
    private String pname = ""; 
    private String versionName = ""; 
    private int versionCode = 0; 
    private Drawable icon; 
    private void addToList(int i) { 
     appnames[i]=appname; 
     pnames[i]=pname; 
     versionnames[i]=versionName; 
     versionCodes[i]=versionCode; 
     icons[i]=icon; 
    } 
} 

private ArrayList<PInfo> getPackages() { 
    ArrayList<PInfo> apps = getInstalledApps(false); /* false = no system packages */ 
    final int max = apps.size(); 
    appnames = new String[max]; 
    pnames = new String[max]; 
    versionnames = new String[max]; 
    versionCodes = new int[max]; 
    icons = new Drawable[max]; 
    for (int i=0; i<max; i++) { 
     apps.get(i).addToList(i); 
    } 
    adapter=new AppAdapter(AppList.this, R.layout.row, appnames, pnames, versionnames, versionCodes, icons); 
    return apps; 
} 

private ArrayList<PInfo> getInstalledApps(boolean getSysPackages) { 
    ArrayList<PInfo> res = new ArrayList<PInfo>();   
    List<PackageInfo> packs = getPackageManager().getInstalledPackages(0); 
    List<ApplicationInfo> appli = getPackageManager().getInstalledApplications(0); 
    for(int i=0;i<packs.size();i++) { 
     PackageInfo p = packs.get(i); 
     if ((appli.get(i).flags & ApplicationInfo.FLAG_SYSTEM)!=0&&(!getSysPackages) || (p.versionName == null)) { 
      continue ; 
     } 
     PInfo newInfo = new PInfo(); 
     newInfo.appname = p.applicationInfo.loadLabel(getPackageManager()).toString(); 
     newInfo.pname = p.packageName; 
     newInfo.versionName = p.versionName; 
     newInfo.versionCode = p.versionCode; 
     newInfo.icon = p.applicationInfo.loadIcon(getPackageManager()); 
     res.add(newInfo); 
    } 
    return res; 
} 
public static class AppAdapter extends BaseAdapter { 
    private static LayoutInflater mInflater; 
    // Keep all Images in array 
    private static Drawable[] mThumbIds; 
    private static String appnames[], Pnames[], versionnames[]; 
    private static int versionCodes[]; 
    private static int mViewResourceId; 
    private static ImageView pic; 
    private static TextView tv1, tv2, tv3, tv4; 
    // Constructor 
    public AppAdapter(Context ctx, int viewResourceId,String[] names, String[] pnames, String[] vnames, int[] vcodes, Drawable[] icons) { 
     mInflater = (LayoutInflater) ctx 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     mThumbIds = icons; 
     appnames = names; 
     Pnames = pnames; 
     versionnames = vnames; 
     versionCodes = vcodes; 
     mViewResourceId = viewResourceId; 
    } 

    @Override 
    public int getCount() { 
     return mThumbIds.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     return mThumbIds[position]; 
    } 

    @Override 
    public long getItemId(int position) { 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     convertView = mInflater.inflate(mViewResourceId, lView, false); 
     pic = (ImageView) convertView.findViewById(R.id.iconView); 
     tv1 = (TextView) convertView.findViewById(R.id.appName); 
     tv2 = (TextView) convertView.findViewById(R.id.packageName); 
     tv3 = (TextView) convertView.findViewById(R.id.versionName); 
     tv4 = (TextView) convertView.findViewById(R.id.versionCode); 
     //Drawable background = new BitmapDrawable(mThumbIds[position]); 
     pic.setImageDrawable(mThumbIds[position]); 
     pic.invalidate(); 
     tv1.setText(appnames[position]); 
     tv2.setText(Pnames[position]); 
     tv3.setText(versionnames[position]); 
     tv4.setText(versionCodes[position]+"");   
     return convertView; 
    } 
} 

}