样式和主题

2018-05-14 本文已影响0人 Summer_27d1

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主题（Theme）

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---------------效果图------------

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--------------------代码------------------
封装一个AppInfo类
package com.example.app03_allaopp;

import android.graphics.drawable.Drawable;

/**

*应用信息的封装类

*/
public class AppInfo {
private Drawable icon;//应用图标图片对象
private String appName; //应用名称
private String packageName;//包名
public Drawable getIcon() {
return icon;
}
public void setIcon(Drawable icon) {
this.icon = icon;
}
public String getAppName() {
return appName;
}
public void setAppName(String appName) {
this.appName = appName;
}
public String getPackageName() {
return packageName;
}
public void setPackageName(String packageName) {
this.packageName = packageName;
}
public AppInfo(Drawable icon, String appName, String packageName) {
super();
this.icon = icon;
this.appName = appName;
this.packageName = packageName;
}
public AppInfo() {
super();
}

}
-------------MainActivity----------------
package com.example.app03_allaopp;

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

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private ListView lv_main;//列表控件
private List<AppInfo> data;//数据的集合
private AppAdapter adpater;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

    lv_main=(ListView) findViewById(R.id.lv_main);
    data=getAllAppInfos();
    adpater=new AppAdapter();
    //显示列表
    lv_main.setAdapter(adpater);
    //给ListView设置条目的点击监听
    lv_main.setOnItemClickListener(new OnItemClickListener() {
        /**
         * Parent listView
         * view 当前行的Item视图对象
         * position 当前行下标
         * */
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            //提示当前行的应用名称
            String appName = data.get(position).getAppName();
            //提示
            Toast.makeText(MainActivity.this, appName, Toast.LENGTH_SHORT).show();
        }
    });
    //给ListView设置条目的长按监听
    lv_main.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                int position, long id) {
            /**
            //       删除当前行 数据
            //       * */
                data.remove(position);
                //更新列表
               adpater.notifyDataSetChanged();//通知适配器更新列表



            return true;//事件消费  点击监听不会吐司
        }
    });
}
/*
 * 得到手机中所有应用信息的列表
 * AppInfo
 *  Drawable icon 图片对象
 *  String appName  应用名称
 *  String packageName   包名
 */
protected List<AppInfo> getAllAppInfos() {

    List<AppInfo> list = new ArrayList<AppInfo>();
    // 得到应用的packgeManager
    PackageManager packageManager = getPackageManager();
    // 创建一个主界面的intent
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    // 得到包含应用信息的列表
    List<ResolveInfo> ResolveInfos = packageManager.queryIntentActivities(
            intent, 0);
    // 遍历
    for (ResolveInfo ri : ResolveInfos) {
        // 得到包名
        String packageName = ri.activityInfo.packageName;
        // 得到图标
        Drawable icon = ri.loadIcon(packageManager);
        // 得到应用名称
        String appName = ri.loadLabel(packageManager).toString();
        // 封装应用信息对象
        AppInfo appInfo = new AppInfo(icon, appName, packageName);
        // 添加到list
        list.add(appInfo);
    }
    return list;
}
//适配器
class AppAdapter extends BaseAdapter{

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

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

    @Override//返回带有数据当前行的Item试图对象
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder=null;

        if (convertView==null) {
            //1. 如果convertView 为null 加载布局
            convertView=View.inflate(MainActivity.this, R.layout.item_main, null);

            holder= new ViewHolder();
            //2.得到当前行需要更新的子view的对象
            holder.imageview=(ImageView) convertView.findViewById(R.id.iv_item_icon);
            holder.textview=(TextView) convertView.findViewById(R.id.tv_item_name);
            convertView.setTag(holder);
        }else{
            holder=(ViewHolder) convertView.getTag();//如果不为空就取
        }
        //3.得到当前行的对象
        AppInfo info=data.get(position);
        //4.给视图绑定数据
        holder.imageview.setImageDrawable(info.getIcon());
        holder.textview.setText(info.getAppName());
        //5.返回convertView
        return convertView;
    }
    class ViewHolder{
        ImageView imageview;
        TextView textview;

    }
}
// public void dialog(View v){
// 
// new AlertDialog.Builder(this)
// .setTitle("删除数据")
// .setMessage("要删除数据吗")
// .setPositiveButton("删除", new DialogInterface.OnClickListener() {
//  
//  @Override
//  public void onClick(DialogInterface dialog, int which) {
//      /**
//       删除当前行 数据
//       * */
//      data.remove(position);
//  //更新列表
//      adpater.notifyDataSetChanged();//通知适配器更新列表
//      Toast.makeText(MainActivity.this, "删除数据", Toast.LENGTH_SHORT).show();
//  }
//  }

//}
}
---------------GridView的应用-------------

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-------------效果图---------------------

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-----------------代码----------------
package com.example.app04_gridview;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.GridView;

public class MainActivity extends Activity {
private GridView gv_main;
private MainAdapter adapter;
String [] names=new String[]{"手机防盗","通讯卫士","软件管理","流量管理","进程管理","手机杀毒","22","33","44"};
int [] icons=new int[]{R.drawable.widget01,
R.drawable.widget02,R.drawable.widget03,
R.drawable.widget04,R.drawable.widget05,R.drawable.widget06,
R.drawable.widget07,R.drawable.widget08,R.drawable.widget09};

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

    gv_main=(GridView) findViewById(R.id.gv_main);
    adapter=new MainAdapter(MainActivity.this,names,icons);
    gv_main.setAdapter(adapter);
    
}

}
-------------自定义的封装类MainAdpater-----------
···
package com.example.app04_gridview;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MainAdapter extends BaseAdapter{
private String[] names;
private int[] icons;
private Context context;
public MainAdapter(Context context,String[] names,int[] icons) {
this.context=context;
this.names=names;
this.icons=icons;

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

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolser holder=null;
    if (convertView==null) {
        convertView=View.inflate(context, R.layout.item_main, null);
        holder=new ViewHolser();
        holder.imageView = (ImageView) convertView.findViewById(R.id.iv_id1);
        holder.textView = (TextView) convertView.findViewById(R.id.tv_id1);
        convertView.setTag(holder);
          
    }else{
        holder = (ViewHolser) convertView.getTag();
    }
    holder.imageView.setImageResource(icons[position]);
    holder.textView.setText(names[position]);
    
    return convertView;
}

class ViewHolser{
ImageView imageView;
TextView textView;
}
}

···
*************item.xml*****
···
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="80dp"
android:layout_height="80dp"
android:orientation="vertical"
android:gravity="center"
>

<ImageView
    android:id="@+id/iv_id1"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/tv_id1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="16sp"
    
    android:text="名称" />

</LinearLayout>

···
--------activity.xml-----------------
···
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gv_main"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="3"
>

</GridView>
···

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