Android开发之afinal框架笔记

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.single);
 
    new Thread(postLoad).start();
 
}
     
Runnable postLoad = new Runnable(){
           
    @Override
    public void run() {  
        // TODO Auto-generated method stub  
        // 在这里执行联网操作
    }
};

Runnable postLoad = new Runnable(){
           
    @Override
    public void run() {  
        // TODO Auto-generated method stub
        // 联网获取数据 data
        TextView textShow = (TextView) findViewById(R.id.show);
        textShow.post(new Runnable() {
               
            @Override
            public void run() { // 该方法会在 ui 线程执行 
                textShow.setText(data);
            }
        });
    }
};

final ConnectivityManager mConnectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
// 检查网络连接，如果无网络可用，就不需要进行连网操作等 
NetworkInfo info = mConnectivity.getActiveNetworkInfo();    
if (info != null ) { // 若有网络
    // 判断网络连接类型
    int netType = info.getType(); 
    int netSubtype = info.getSubtype(); 
 
    if (netType == ConnectivityManager.TYPE_WIFI) { 
        // 若为 WIFI
    } else if (netType == ConnectivityManager.TYPE_MOBILE && netSubtype == TelephonyManager.NETWORK_TYPE_UMTS ) { 
        // 若为 3G
    } else { 
        // 其他网络
    }
} else { // 若无网络
 
}

public class Main extends Activity {
 
    Button page;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        page = (Button) findViewById(R.id.open);
 
        page.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View source) {
                Intent intent = new Intent(Main.this, NewPage.class);
 
                // 启动 intent 对应的 Activity ，并且等待其返回结果，其中 0 是标识码
                startActivityForResult(intent, 0);
            }
        });
     
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent){
         
        if( requestCode == 0 && resultCode == 0 ){ // 确认请求标识码和反馈结果标识码同为 0
            // 改变本页面或其他操作
        }
    }
 
}

public class NewPage extends Activity {
 
    Button cancel;
 
    Intent intent;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.newpage);
         
        // 获取到上一个页面传过来的 Intent
        intent = this.getIntent();
 
        cancel = (Button) findViewById(R.id.confirm);
        cancel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View source) {
                // 反馈结果，将 intent 传回上一个 Activity ，这时在上一页触发 onActivityResult 方法，重写该方法可以对原页面作出调整
                NewPage.this.setResult(0, intent);
                NewPage.this.finish();
            }
        });
 
    }
 
}

<TextView

android:id="@+id/tv_quit"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textColor="@drawable/list_item_color" />

list_item_color 文件

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<!-- 单击选中时字体颜色-->

<item android:state_pressed="true" android:color="#FFFFFF" />

<!-- 有焦点时的字体颜色-->

<item android:state_focused="true" android:color="#FFFFFF" />

<!-- 滚动选中时字体颜色-->
<item android:state_selected="true" android:color="#FFFFFF" />

<!-- 默认字体颜色-->

<item android:color="#000000" />

</selector>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
tools:context=".MainActivity" >

<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:text="@string/textview_fold" />

<FrameLayout 
        android:id="@+id/fl_desc" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:layout_below="@id/tv_title" 
        android:fadingEdge="horizontal" 
        android:fadingEdgeLength="5dp" > 

        <TextView 
            android:id="@+id/tv_desc_short" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:maxLines="4" 
            android:textColor="@color/black" 
            android:textSize="16sp" /> 

        <TextView 
            android:id="@+id/tv_desc_long" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:textColor="@color/black" 
            android:textSize="16sp" /> 
    </FrameLayout> 

<Button
android:id="@+id/bt_more"
android:layout_width="50dp"
android:layout_height="25dp"
android:layout_alignParentRight="true"
android:layout_below="@id/fl_desc"
android:layout_marginRight="10dp"
android:background="#1c000000"
android:gravity="center"
android:text="@string/label_more"
android:textSize="15sp"
android:visibility="gone" />

<ImageView
android:id="@+id/iv_more_line"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBaseline="@id/bt_more"
android:layout_below="@id/fl_desc"
android:layout_toLeftOf="@id/bt_more"
android:background="@drawable/more_line"
android:contentDescription="@string/app_name"
android:visibility="gone" />

</RelativeLayout>

package com.example.textviewfold;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

private Button bt_more;
private FrameLayout fl_desc;
private TextView tv_desc_short;
private TextView tv_desc_long;
private boolean isInit = false;
private boolean isShowShortText = true;
private ImageView iv_more_line;

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

findView();
initView();
setListener();
}

private void setListener() {
bt_more.setOnClickListener(this);
}

private void initView() {
String content = " 新浪科技讯 北京时间7月25日凌晨消息，在今天举行的新产品发布会上，谷歌发布Android 4.3版本，代号仍为"果冻豆 (Jelly Bean)"。今天发布的新一代Nexus 7将搭载该操作系统，Nexus系列设备今日可收到OTA推送更新。 Android 4.3操作系统新增一系列功能。首先是多用户设置功能，包括针对保护儿童的“受限文件(restricted profiles)” 特性。用户可以对应用内容进行限制，防止儿童在使用应用时看到不适宜内容，或接触不合适的应用内购买广告。这项功能与微软Windows Phone 的"儿童乐园(Microsoft's Kid's Corner)"功能类似。第二项升级是智能蓝牙(Bluetooth Smart)功 能，即"低功耗蓝牙(Bluetooth Low Energy)"。";
tv_desc_short.setText(content);
tv_desc_long.setText(content);

ViewTreeObserver vto = fl_desc.getViewTreeObserver();
vto.addOnPreDrawListener(new OnPreDrawListener() {
@Override
public boolean onPreDraw() {
if (isInit)
return true;
if (mesureDescription(tv_desc_short, tv_desc_long)) {
iv_more_line.setVisibility(View.VISIBLE);
bt_more.setVisibility(View.VISIBLE);
}
isInit = true;
return true;
}
});
}

/**
* 计算描述信息是否过长
*/
private boolean mesureDescription(TextView shortView, TextView longView) {
final int shortHeight = shortView.getHeight();
final int longHeight = longView.getHeight();
if (longHeight > shortHeight) {
shortView.setVisibility(View.VISIBLE);
longView.setVisibility(View.GONE);
return true;
}
shortView.setVisibility(View.GONE);
longView.setVisibility(View.VISIBLE);
return false;
}

private void findView() {
fl_desc = (FrameLayout) findViewById(R.id.fl_desc);
tv_desc_short = (TextView) findViewById(R.id.tv_desc_short);
tv_desc_long = (TextView) findViewById(R.id.tv_desc_long);

bt_more = (Button) findViewById(R.id.bt_more);
iv_more_line = (ImageView) findViewById(R.id.iv_more_line);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_more:
  if (isShowShortText) { 

                tv_desc_short.setVisibility(View.GONE); 
                tv_desc_long.setVisibility(View.VISIBLE); 
            } else { 
                tv_desc_short.setVisibility(View.VISIBLE); 
                tv_desc_long.setVisibility(View.GONE); 
            } 
toogleMoreButton(bt_more);
isShowShortText = !isShowShortText;
break;

default:
break;
}
}

/**
* 更改按钮【更多】的文本
*/
private void toogleMoreButton(Button btn) {

String text = (String) btn.getText();
String moreText = getString(R.string.label_more);
String lessText = getString(R.string.label_less);
if (moreText.equals(text)) {
btn.setText(lessText);
} else {
btn.setText(moreText);
}
}
}