我根据水果列表改的微博评论
来源:互联网 发布:网络电视怎么搜索电影 编辑:程序博客网 时间:2024/04/29 19:32
第一步,导入水果列表的代码。然后打开Fruit.java,添加变量:private String text;和private String time;分别的评论部分和显示时间的部分。添加Source-Generate Constructor using Fields,确定;再添加Getter、Setter方法。
第二步,这个时候系统会报错,打开MainActivity.java,修改initFruits()这个方法,Fruit apple = new Fruit("潇湘夜雨", R.drawable.p1,"今天好高兴啊!","1分钟前");下边的也类似。
第三步,打开FruitAdapter.java,修改 getView这个方法。添加TextView textView=(TextView)view.findViewById(R.id.textView);
TextView textView2=(TextView)view.findViewById(R.id.textView2);再添加textView.setText(fruit.getText());
textView2.setText(fruit.getTime());
第四步,自定义标题栏。
1.在res/value下建立mytitlebar.xml文件
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="myTitleBg">
<item name="android:background">#FF0000</item>
</style>
<style name="myTheme" parent="android:Theme">
<item name="android:windowNoTitle">false</item>
<item name="android:windowTitleSize">30dp</item>
<item name="android:windowTitleBackgroundStyle">@style/myTitleBg</item>
</style>
</resources>
2.修改AndroidManifest.xml文件
android:theme="@style/myTheme"
下边是代码:
MainActivity.java
- package com.example.ui_listview01;
- import java.util.ArrayList;
- import java.util.List;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.Menu;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.Toast;
- import android.widget.AdapterView.OnItemClickListener;
- import android.widget.ListView;
- import com.example.ui_listview01.adpater.FruitAdapter;
- import com.example.ui_listview01.model.Fruit;
- public class MainActivity extends Activity {
- private ListView lvFruits;
- //1.准备好数据源
- private List<Fruit> fruitList = new ArrayList<Fruit>();
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- //1.准备好数据源
- initFruits();
- lvFruits = (ListView) findViewById(R.id.lvFruits);
- //2.创建Adapter
- FruitAdapter adapter=new FruitAdapter(this, R.layout.fruit_item,fruitList);
- //3.绑定AdapterView和Adapter之间的关联
- lvFruits.setAdapter(adapter);
- lvFruits.setOnItemClickListener(new OnItemClickListener() {
- public void onItemClick(AdapterView<?> adapterView, View view, int position,
- long id) {
- Fruit fruit=fruitList.get(position);
- Toast.makeText(MainActivity.this, fruit.getName(), Toast.LENGTH_SHORT).show();
- }
- });
- }
- private void initFruits() {
- Fruit apple = new Fruit("潇湘夜雨", R.drawable.p1,"今天好高兴啊!","1分钟前");
- fruitList.add(apple);
- Fruit banana = new Fruit("小小", R.drawable.p2,"今天吃了好多啊!","2分钟前");
- fruitList.add(banana);
- Fruit orange = new Fruit("青春无悔", R.drawable.p3,"你今天多的怎么样啊?","3分钟前");
- fruitList.add(orange);
- Fruit watermelon = new Fruit("小丸子", R.drawable.p4,"最近如何呀?","1小时前");
- fruitList.add(watermelon);
- Fruit pear = new Fruit("米粒", R.drawable.p5,"过年好啊!","1.5小时前");
- fruitList.add(pear);
- Fruit grape = new Fruit("丽丽", R.drawable.p6,"我今天中午在学校吃了好多呀!","2小时前");
- fruitList.add(grape);
- Fruit pineapple = new Fruit(" 嘻嘻", R.drawable.p7,"你最近过的咋样啊!","6小时前");
- fruitList.add(pineapple);
- Fruit strawberry = new Fruit("晕晕", R.drawable.p8,"我今晚上吃啥呀","1天前");
- fruitList.add(strawberry);
- Fruit cherry = new Fruit("哈哈", R.drawable.p10,"再见了,各位朋友~","1周前");
- fruitList.add(cherry);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- // Inflate the menu; this adds items to the action bar if it is present.
- getMenuInflater().inflate(R.menu.main, menu);
- return true;
- }
- }
FruitAdapter.java
- package com.example.ui_listview01.adpater;
- import java.util.List;
- import android.content.Context;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.ArrayAdapter;
- import android.widget.BaseAdapter;
- import android.widget.ImageView;
- import android.widget.TextView;
- import com.example.ui_listview01.R;
- import com.example.ui_listview01.model.Fruit;
- //存在问题:在FruitAdapter的getView()方法中每次都将布局重新加载了一遍,当ListView快速滚动的时候这就会成为性能的瓶颈
- public class FruitAdapter extends ArrayAdapter<Fruit> {
- private int resourceId;
- public FruitAdapter(Context context, int textViewResourceId,
- List<Fruit> data) {
- super(context, textViewResourceId, data);
- resourceId=textViewResourceId;
- }
- // 这个方法在每个子项被滚动到屏幕内的时候会被调用
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- Fruit fruit = getItem(position);
- View view=LayoutInflater.from(getContext()).inflate(resourceId, null);
- ImageView ivFruit=(ImageView) view.findViewById(R.id.ivFruit);
- TextView tvFruit=(TextView) view.findViewById(R.id.tvFruit);
- TextView textView=(TextView)view.findViewById(R.id.textView);
- TextView textView2=(TextView)view.findViewById(R.id.textView2);
- ivFruit.setImageResource(fruit.getImageId());
- tvFruit.setText(fruit.getName());
- textView.setText(fruit.getText());
- textView2.setText(fruit.getTime());
- return view;
- }
- }
package com.example.ui_listview01.adpater;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.example.ui_listview01.R;import com.example.ui_listview01.model.Fruit;//存在问题:在FruitAdapter的getView()方法中每次都将布局重新加载了一遍,当ListView快速滚动的时候这就会成为性能的瓶颈public class FruitAdapter extends ArrayAdapter<Fruit> {private int resourceId;public FruitAdapter(Context context, int textViewResourceId,List<Fruit> data) {super(context, textViewResourceId, data);resourceId=textViewResourceId;}// 这个方法在每个子项被滚动到屏幕内的时候会被调用@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Fruit fruit = getItem(position);View view=LayoutInflater.from(getContext()).inflate(resourceId, null);ImageView ivFruit=(ImageView) view.findViewById(R.id.ivFruit);TextView tvFruit=(TextView) view.findViewById(R.id.tvFruit);TextView textView=(TextView)view.findViewById(R.id.textView);TextView textView2=(TextView)view.findViewById(R.id.textView2);ivFruit.setImageResource(fruit.getImageId());tvFruit.setText(fruit.getName());textView.setText(fruit.getText());textView2.setText(fruit.getTime());return view;}}
FruitAdapterImprove1.java
- package com.example.ui_listview01.adpater;
- import android.content.Context;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.ArrayAdapter;
- import android.widget.ImageView;
- import android.widget.TextView;
- import com.example.ui_listview01.R;
- import com.example.ui_listview01.model.Fruit;
- //存在问题:虽然现在已经不会再重复去加载布局,但是每次在getView()方法中还是会调用View的findViewById()方法来获取一次控件的实例。
- public class FruitAdapterImprove1 extends ArrayAdapter {
- private int resourceId;
- public FruitAdapterImprove1(Context context, int textViewResourceId) {
- super(context, textViewResourceId);
- resourceId = textViewResourceId;
- }
- // 这个方法在每个子项被滚动到屏幕内的时候会被调用
- //getView()方法中还有一个convertView参数,这个参数用于将之前加载好的布局进行缓存,以便之后可以进行重用
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- Fruit fruit = (Fruit) getItem(position);
- View view=null;
- if(convertView==null)
- view = LayoutInflater.from(getContext()).inflate(resourceId, null);
- else
- view=convertView;
- ImageView fruitImage = (ImageView) view.findViewById(R.id.ivFruit);
- TextView fruitName = (TextView) view.findViewById(R.id.tvFruit);
- fruitImage.setImageResource(fruit.getImageId());
- fruitName.setText(fruit.getName());
- return view;
- }
- }
package com.example.ui_listview01.adpater;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import com.example.ui_listview01.R;import com.example.ui_listview01.model.Fruit;//存在问题:虽然现在已经不会再重复去加载布局,但是每次在getView()方法中还是会调用View的findViewById()方法来获取一次控件的实例。public class FruitAdapterImprove1 extends ArrayAdapter {private int resourceId;public FruitAdapterImprove1(Context context, int textViewResourceId) {super(context, textViewResourceId);resourceId = textViewResourceId;}// 这个方法在每个子项被滚动到屏幕内的时候会被调用//getView()方法中还有一个convertView参数,这个参数用于将之前加载好的布局进行缓存,以便之后可以进行重用@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Fruit fruit = (Fruit) getItem(position);View view=null;if(convertView==null) view = LayoutInflater.from(getContext()).inflate(resourceId, null);else view=convertView;ImageView fruitImage = (ImageView) view.findViewById(R.id.ivFruit);TextView fruitName = (TextView) view.findViewById(R.id.tvFruit);fruitImage.setImageResource(fruit.getImageId());fruitName.setText(fruit.getName());return view;}}
FruitAdapterImprove2.doc
- package com.example.ui_listview01.adpater;
- import android.content.Context;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.ArrayAdapter;
- import android.widget.ImageView;
- import android.widget.TextView;
- import com.example.ui_listview01.R;
- import com.example.ui_listview01.model.Fruit;
- //我们新增了一个内部类ViewHolder,用于对控件的实例进行缓存。
- //当convertView为空的时候,创建一个ViewHolder对象,并将控件的实例都存放在ViewHolder里,然后调用View的setTag()方法,将ViewHolder对象存储在View中。
- //当convertView不为空的时候则调用View的getTag()方法,把ViewHolder重新取出。
- //这样所有控件的实例都缓存在了ViewHolder里,就没有必要每次都通过findViewById()方法来获取控件实例了。
- public class FruitAdapterImprove2 extends ArrayAdapter {
- private int resourceId;
- public FruitAdapterImprove2(Context context, int textViewResourceId) {
- super(context, textViewResourceId);
- resourceId = textViewResourceId;
- }
- // 这个方法在每个子项被滚动到屏幕内的时候会被调用
- // getView()方法中还有一个convertView参数,这个参数用于将之前加载好的布局进行缓存,以便之后可以进行重用
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- Fruit fruit = (Fruit) getItem(position);
- View view = null;
- ViewHolder viewHolder;
- if (convertView == null) {
- view = LayoutInflater.from(getContext()).inflate(resourceId, null);
- viewHolder = new ViewHolder();
- viewHolder.ivFruit = (ImageView) view.findViewById(R.id.ivFruit);
- viewHolder.tvFruit = (TextView) view.findViewById(R.id.tvFruit);
- view.setTag(viewHolder);
- } else {
- view = convertView;
- viewHolder = (ViewHolder) convertView.getTag();
- }
- viewHolder.ivFruit.setImageResource(fruit.getImageId());
- viewHolder.tvFruit.setText(fruit.getName());
- return view;
- }
- class ViewHolder {
- ImageView ivFruit;
- TextView tvFruit;
- }
- }
package com.example.ui_listview01.adpater;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import com.example.ui_listview01.R;import com.example.ui_listview01.model.Fruit;//我们新增了一个内部类ViewHolder,用于对控件的实例进行缓存。//当convertView为空的时候,创建一个ViewHolder对象,并将控件的实例都存放在ViewHolder里,然后调用View的setTag()方法,将ViewHolder对象存储在View中。//当convertView不为空的时候则调用View的getTag()方法,把ViewHolder重新取出。//这样所有控件的实例都缓存在了ViewHolder里,就没有必要每次都通过findViewById()方法来获取控件实例了。public class FruitAdapterImprove2 extends ArrayAdapter {private int resourceId;public FruitAdapterImprove2(Context context, int textViewResourceId) {super(context, textViewResourceId);resourceId = textViewResourceId;}// 这个方法在每个子项被滚动到屏幕内的时候会被调用// getView()方法中还有一个convertView参数,这个参数用于将之前加载好的布局进行缓存,以便之后可以进行重用@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Fruit fruit = (Fruit) getItem(position);View view = null;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.ivFruit = (ImageView) view.findViewById(R.id.ivFruit);viewHolder.tvFruit = (TextView) view.findViewById(R.id.tvFruit);view.setTag(viewHolder);} else {view = convertView;viewHolder = (ViewHolder) convertView.getTag();}viewHolder.ivFruit.setImageResource(fruit.getImageId());viewHolder.tvFruit.setText(fruit.getName());return view;}class ViewHolder {ImageView ivFruit;TextView tvFruit;}}
Fruit.java
- package com.example.ui_listview01.model;
- public class Fruit {
- private String name;
- private int imageId;
- private String text;
- private String time;
- public Fruit(String name, int imageId, String text, String time) {
- super();
- this.name = name;
- this.imageId = imageId;
- this.text = text;
- this.time = time;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public int getImageId() {
- return imageId;
- }
- public void setImageId(int imageId) {
- this.imageId = imageId;
- }
- public String getText() {
- return text;
- }
- public void setText(String text) {
- this.text = text;
- }
- public String getTime() {
- return time;
- }
- public void setTime(String time) {
- this.time = time;
- }
- }
package com.example.ui_listview01.model;public class Fruit {private String name;private int imageId;private String text;private String time;public Fruit(String name, int imageId, String text, String time) {super();this.name = name;this.imageId = imageId;this.text = text;this.time = time;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getImageId() {return imageId;}public void setImageId(int imageId) {this.imageId = imageId;}public String getText() {return text;}public void setText(String text) {this.text = text;}public String getTime() {return time;}public void setTime(String time) {this.time = time;}}
fruit_item.xml
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:orientation="horizontal" >
- <ImageView
- android:id="@+id/ivFruit"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/p1" />
- <TextView
- android:id="@+id/tvFruit"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="10dp"
- android:layout_marginLeft="27dp"
- android:layout_toRightOf="@+id/ivFruit"
- android:text="Apple" />
- <TextView
- android:id="@+id/textView"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignLeft="@+id/tvFruit"
- android:layout_below="@+id/tvFruit"
- android:layout_marginLeft="21dp"
- android:text="今天真高兴" />
- <TextView
- android:id="@+id/textView2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignBaseline="@+id/tvFruit"
- android:layout_alignBottom="@+id/tvFruit"
- android:layout_alignParentRight="true"
- android:layout_marginRight="16dp"
- android:text="TextView" />
- </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:id="@+id/ivFruit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/p1" /> <TextView android:id="@+id/tvFruit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:layout_marginLeft="27dp" android:layout_toRightOf="@+id/ivFruit" android:text="Apple" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/tvFruit" android:layout_below="@+id/tvFruit" android:layout_marginLeft="21dp" android:text="今天真高兴" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/tvFruit" android:layout_alignBottom="@+id/tvFruit" android:layout_alignParentRight="true" android:layout_marginRight="16dp" android:text="TextView" /></RelativeLayout>
activity_main.xml
- <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" >
- <ListView
- android:id="@+id/lvFruits"
- android:layout_width="match_parent"
- android:layout_height="wrap_content" >
- </ListView>
- </LinearLayout>
<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" > <ListView android:id="@+id/lvFruits" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView></LinearLayout>
AndroidManifest.xml
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="com.example.ui_listview01"
- 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/myTheme" >
- <activity
- android:name="com.example.ui_listview01.MainActivity"
- android:label="@string/app_name" >
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- </application>
- </manifest>
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