Android---launcher学习

      今天看到http://www.bangchui.org/read.php?tid=11761介绍有关launcher的内容，就想模仿的做一下，结果发现，就这有图标，没应用的名字怪怪的，于是做了改进。。

布局文件两个一个是main.xml,几乎没改动。。。

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><GridViewandroid:layout_width="fill_parent"android:layout_height="fill_parent"android:numColumns="4"android:id="@+id/apps_list"></GridView></LinearLayout>

自己写了个item的布局，定义gridView每个条目的样式。。。

<?xml version="1.0" encoding="utf-8"?>  <RelativeLayout            xmlns:android="http://schemas.android.com/apk/res/android"            android:layout_height="wrap_content"            android:paddingBottom="4dip" android:layout_width="fill_parent">           <ImageView                  android:layout_height="50dip"                  android:id="@+id/ItemImage"                  android:layout_width="50dip"                  android:layout_centerHorizontal="true">            </ImageView>           <TextView                  android:layout_width="wrap_content"                  android:layout_below="@+id/ItemImage"                  android:layout_height="wrap_content"                  android:layout_centerHorizontal="true"                  android:id="@+id/ItemText">           </TextView>  </RelativeLayout>

最后整个Activity的代码如下：

package com.wufen;import java.util.List;import android.app.Activity;import android.content.Intent;import android.content.pm.PackageInfo;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.TextView;public class MyLauncher extends Activity {private List<ResolveInfo> mApps;GridView myGrid;private List<String> name;private LayoutInflater mInflater;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// setContentView(R.layout.main);loadApps();setContentView(R.layout.main);myGrid = (GridView) findViewById(R.id.apps_list);myGrid.setAdapter(new AppsAdater());}public void loadApps() {Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);mApps = getPackageManager().queryIntentActivities(mainIntent, 0);Log.i("wufen", "" + mApps);}public class AppsAdater extends BaseAdapter {public AppsAdater() {mInflater = LayoutInflater.from(MyLauncher.this);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn mApps.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn mApps.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;if (convertView == null) {convertView = mInflater.inflate(R.layout.item, null);holder = new ViewHolder();holder.image = (ImageView) convertView.findViewById(R.id.ItemImage);holder.name = (TextView) convertView.findViewById(R.id.ItemText);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}ResolveInfo info = mApps.get(position);holder.image.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));holder.name.setText(info.activityInfo.loadLabel(getPackageManager()));return convertView;}class ViewHolder {public TextView name;public ImageView image;}}}

效果图：

修改前                                                                                                     修改后