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Android学习之GroupActivity

article 2025/6/27 8:45:14

实现菜单功能,其中定一个Gridview和一个LineaLayout 两个组建，其中同时用到了Dialog

其中，最重要的地方有Adapter 和切换图片对于Activity 需要继承为 ActivityGroup，才有获取getLocalActivityManager（）的方法

ContentActivity布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/LinearLayout1"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity" ><ImageViewandroid:id="@+id/img"android:layout_width="266dp"android:layout_height="382dp"android:src="@drawable/meinv" /></LinearLayout>

MainActivity布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/LinearLayout1"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity" ><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent" ><!-- 包含的内容 --><LinearLayoutandroid:id="@+id/content"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ></LinearLayout><!--定义整体的布局文件  定义工具栏定义GridView android:layout_alignParentBottom 设定在底部对齐android:fadingEdgeLength  标签褪色--><GridViewandroid:id="@+id/gridViewBar"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:fadingEdge="vertical"android:fadingEdgeLength="5sp" ></GridView></RelativeLayout></LinearLayout>

MainActivity代码

package com.example.day09_09_activitygroup01;import android.app.ActivityGroup;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;public class MainActivity extends ActivityGroup {private GridView gridBar;private LinearLayout content;private MenuIMageAdapter adapter;// 定义数据private int[] img_data = new int[] { R.drawable.menu_main,R.drawable.menu_news, R.drawable.menu_contact,R.drawable.menu_more, R.drawable.menu_exit };private int width;private int height;private Intent intent;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 取消标题显示super.requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);// 获取屏幕的高宽width = super.getWindowManager().getDefaultDisplay().getWidth()/ this.img_data.length;// 高度用于显示GridViewheight = super.getWindowManager().getDefaultDisplay().getHeight() / 8;// 获取控件gridBar = (GridView) super.findViewById(R.id.gridViewBar);content = (LinearLayout) super.findViewById(R.id.content);// 设定GridView的每一列显示的个数gridBar.setNumColumns(img_data.length);// 设定为透明色gridBar.setSelector(new ColorDrawable(Color.TRANSPARENT));gridBar.setGravity(Gravity.CENTER);gridBar.setVerticalSpacing(0);// 设定Adapteradapter = new MenuIMageAdapter(MainActivity.this, img_data, width,height, 4);gridBar.setAdapter(adapter);// 跳转ActivitygridBar.setOnItemClickListener(new ShowSub());}private class ShowSub implements OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {// TODO Auto-generated method stubMainActivity.this.switchActivity(position);}}private void switchActivity(int position) {adapter.setFocus(position);// 删除所有的Activitythis.content.removeAllViews();// 跳转Activityswitch (position) {case 0:intent = new Intent(MainActivity.this, SecondActivity.class);break;case 1:intent = new Intent(MainActivity.this, SecondActivity.class);break;case 2:intent = new Intent(MainActivity.this, SecondActivity.class);break;case 3:intent = new Intent(MainActivity.this, SecondActivity.class);break;case 4:MainActivity.this.showExitDialog();return;}// 转到一个Activty中intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);// 创建windowWindow second = super.getLocalActivityManager().startActivity("second",intent);// 建立Window 顶端显示this.content.addView(second.getDecorView(), LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);}public void showExitDialog() {Dialog dialog = new AlertDialog.Builder(MainActivity.this).setTitle("退出").setMessage("确认退出").setIcon(R.drawable.ic_launcher).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubdialog.dismiss();}}).setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub// 退出MainActivity.this.finish();}}).create();dialog.show();}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif (keyCode == KeyEvent.KEYCODE_BACK) {MainActivity.this.showExitDialog();}return super.onKeyDown(keyCode, event);}}

CotentActivity代码

package com.example.day09_09_activitygroup01;import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;public class SecondActivity extends Activity {//读取第二哥Activity@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);}
}

GridBarImageAdapter 最重要的

package com.example.day09_09_activitygroup01;import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;public class MenuIMageAdapter extends BaseAdapter {private ImageView [] imageViews = null;private Context context;private int  selected;/** Context用于接受上下文* ImageView 用于接受传递过来的ImageView* width 和height 用于计算Menu的显示高度* selected 用于设定当Menu选中的时候，设定背景*/public MenuIMageAdapter(Context context,int [] imgs,int width,int height ,int selected) {super();this.context = context;this.selected = selected;//开辟ImageView的空间this.imageViews = new ImageView[imgs.length];for(int i=0;i<imgs.length;i++){this.imageViews[i] = new ImageView(context);//设定显示风格this.imageViews[i].setLayoutParams(new GridView.LayoutParams(width,height));//设定调整边距显示this.imageViews[i].setAdjustViewBounds(false);//设定边距this.imageViews[i].setPadding(3, 3, 3, 3);//设定图片this.imageViews[i].setImageResource(imgs[i]);}}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn imageViews.length;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn imageViews[position];}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {//图片显示//convertView 判断是否存在视图ImageView newImage = null;if(convertView == newImage){newImage = this.imageViews[position];}else{//当存在视图，直接转换为ImageViewnewImage = (ImageView) convertView;}return newImage;}//设定选中显示public void setFocus(int selectedID){//当没有背景的时候，设定为 0 为Nullfor(int i=0;i<imageViews.length;i++){if(i != selectedID){this.imageViews[i].setBackgroundResource(0);}}//设定选中的北京this.imageViews[selectedID].setBackgroundResource(R.drawable.menu_background);}
}

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