Android记录8--简单自定义Launcher实现

Android记录8--简单自定义Launcher实现

实现Launcher还是比较容易，我想做手机桌面的这个点应该用得比较多，最近看到一个自定义launcher的效果不会实现，是一种圆弧形的，我还要去想想怎么布局还有用什么控件去实现，这里我就简单实现一个launcher。

界面效果如图：

点击菜单键就好出现launcher的发送方式，如果设置为默认，每次启动都是右边的界面了。

下面看具体是实现：

先在AndroidMenifest.xml增加两行

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.wwj.launcher"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.wwj.launcher.HeyWwj"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />                <!-- 增加以下两行 -->                <category android:name="android.intent.category.HOME"/>                <category android:name="android.intent.category.DEFAULT"/>                            </intent-filter>        </activity>    </application></manifest>

/LanchuerTest/src/com/wwj/launcher/HeyWwj.java

Activity

package com.wwj.launcher;import java.util.List;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;public class HeyWwj extends Activity {private GridView mGridView;private List<ResolveInfo> mApps;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);loadApps();mGridView = (GridView) findViewById(R.id.gridView1);mGridView.setAdapter(new AppAdapter(this, mApps));mGridView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {ResolveInfo info = mApps.get(position);// 应用的包名String pkg = info.activityInfo.packageName;// 应用的主ActivityString cls = info.activityInfo.name;ComponentName componentName = new ComponentName(pkg, cls);Intent intent = new Intent();intent.setComponent(componentName);startActivity(intent);}});}/** * 加载app */private void loadApps() {Intent intent = new Intent(Intent.ACTION_MAIN, null);intent.addCategory(Intent.CATEGORY_LAUNCHER);mApps = getPackageManager().queryIntentActivities(intent, 0);}}

自定义适配器

/LanchuerTest/src/com/wwj/launcher/AppAdapter.java

package com.wwj.launcher;import java.util.List;import android.content.Context;import android.content.pm.ResolveInfo;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.ImageView.ScaleType;public class AppAdapter extends BaseAdapter {List<ResolveInfo> mApps;Context context;public AppAdapter(Context context, List<ResolveInfo> apps) {super();this.context = context;this.mApps = apps;}@Overridepublic int getCount() {return mApps.size();}@Overridepublic Object getItem(int position) {return mApps.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ImageView iv;if (convertView == null) {iv = new ImageView(context);iv.setScaleType(ScaleType.FIT_CENTER);iv.setLayoutParams(new GridView.LayoutParams(50,50));} else {iv = (ImageView) convertView;}ResolveInfo info = mApps.get(position);iv.setImageDrawable(info.activityInfo.loadIcon(context.getPackageManager()));return iv;}}

以上就大功告成了，是不是比较简单。不过一般涉及到复杂的需求，也就是比较复杂的界面效果就没那么容易了，这就要靠你们自己的聪明才智了，做出炫丽酷的效果，小巫在这方面就显得力不从心。