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android 实现home键启动并半透明程序背景效果显示全部应用程序

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. android 实现home键启动并半透明程序背景效果显示全部应用程序

android 实现home键启动并半透明程序背景效果显示全部应用程序

 

 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapp"
    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="@android:style/Theme.Translucent"  >
        <activity
            android:name="com.example.myapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.HOME" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

app_item.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:id="@+id/relaGrid"
  android:gravity="center_horizontal"
  android:layout_width="80dp"
  android:paddingTop="5dp"
  android:layout_height="100dp">
  <ImageView
    android:id="@+id/ivAppIcon"
    android:scaleType="fitCenter"
    android:layout_gravity="center_horizontal|top"
    android:layout_width="48dp"
    android:layout_height="48dp" />
  <TextView
    android:id="@+id/tvAppName"
    android:layout_width="74dp"
    android:ellipsize="marquee"
    android:textColor="#FFFF"
    android:layout_height="50dp"
    android:gravity="center_horizontal|center_vertical" />
</LinearLayout>

 

MainActivity

package com.example.myapp;

import java.util.List;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
    private List<ResolveInfo> mApps;
    GridView mGrid;

    private OnItemClickListener listener = new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
            ResolveInfo info = mApps.get(position);

            //该应用的包名
            String pkg = info.activityInfo.packageName;
            //应用的主activity类
            String cls = info.activityInfo.name;

            ComponentName componet = new ComponentName(pkg, cls);

            Intent i = new Intent();
            i.setComponent(componet);
            startActivity(i);
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        loadApps();
        setContentView(R.layout.activity_main);
        mGrid = (GridView)findViewById(R.id.apps_list);
        mGrid.setBackgroundColor(0xcc00cc00);
        mGrid.setAdapter(new ImageAdapter(this));
        mGrid.setOnItemClickListener(listener);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);

        return true;
    }

    private void loadApps(){
        Intent mainIntent = new Intent(Intent.ACTION_MAIN,null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        mApps = getPackageManager().queryIntentActivities(mainIntent,0);    
    }

    private class ImageAdapter extends BaseAdapter {  
        private LayoutInflater mInflater;  

        public ImageAdapter(Context context) {  
            this.mInflater = LayoutInflater.from(context);
        }  
        /** 
         * 获取当前Adapter的Items数目 
         */  
        public int getCount() {  
            return mApps.size();  
        }  
        /** 
         * 获取相应position的Item 
         */  
        public Object getItem(int position) {  
            return mApps.get(position); 
        }  
        /** 
         * 获取相应position的Item在List中的row id 
         */  
        public long getItemId(int position) {  
            return position;  
        }  
        /** 
         *  position就是位置从0开始 
         *  convertView是GridView每一项要显示的内容,也就是  R.layout.app_item中所定义的布局 
         *  parent就是父窗体GridView  
         */  

        public View getView(int position, View convertView, ViewGroup parent) {  
            System.out.println("==Pos:"+position);
            ViewHolder holder;  
            if (convertView == null) {  

                convertView = mInflater.inflate(R.layout.app_item, null);  
                holder = new ViewHolder();                
                holder.text = (TextView) convertView.findViewById(R.id.tvAppName);  
                holder.icon = (ImageView) convertView.findViewById(R.id.ivAppIcon);  
                convertView.setTag(holder);  
            } else {  
                holder = (ViewHolder) convertView.getTag();  
            }  
            ResolveInfo info = mApps.get(position);
            //holder.text.setTextColor(android.graphics.Color.BLUE);
            holder.text.setText(info.activityInfo.loadLabel(getPackageManager()));  
            holder.icon.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));  
            return convertView;  
        }  
        class ViewHolder {  
            TextView text;  
            ImageView icon;  
        }  
    } 

    public class AppsAdapter extends BaseAdapter {
        public AppsAdapter() {
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView i;

            if (convertView == null) {
                i = new ImageView(MainActivity.this);
                i.setScaleType(ImageView.ScaleType.FIT_CENTER);
                i.setLayoutParams(new GridView.LayoutParams(50, 50));
            } else {
                i = (ImageView) convertView;
            }

            ResolveInfo info = mApps.get(position);
            i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));

            return i;
        }

        public final int getCount() {
            return mApps.size();
        }

        public final Object getItem(int position) {
            return mApps.get(position);
        }

        public final long getItemId(int position) {
            return position;
        }
    }

}

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android 实现home键启动并半透明程序背景效果显示全部应用程序


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