常见问题参考合辑

java 读文件 /article/5709694.html

java 写文件 http://www.jb51.net/article/47062.htm

while(true) {
// Read from the InputStream
try {
if( (bytes = mmInStream.read(buffer)) > 0 )  {
resultbuffer.append(new String(buffer,0,bytes));
}

if(resultbuffer.length() == 32) {
String s = resultbuffer.toString();
LogUtil.i(TAG,s);
Message msg = new Message();
msg.obj = s;
msg.what = 2;
LinkDetectedHandler.sendMessage(msg);
break;
}

} catch (IOException e) {
// TODO Auto-generated catch block
//如果在已连接的情况下，血压计突然关闭，会导致读不到数据
e.printStackTrace();
Message msg = new Message();
msg.obj = "连接异常！正在重连...";
msg.what = 1;
LinkDetectedHandler.sendMessage(msg);
break;
}

View Code

多线程 http://blog.csdn.net/michellehsiao/article/details/7639788
字符串拼接：http://developer.51cto.com/art/201306/400370.htm

Linux学习之CentOS(十四)--初识ssh

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不能忽视的hierarchy viewer
http://www.shangxueba.com/jingyan/113092.html
Inflate的奇怪问题，在做桌面时，allapp一直显示不了，问题出在this参数上

LayoutInflater.from(context).inflate(R.layout.apps_customize_pane, this);
http://www.cnblogs.com/HighFun/p/3281674.html
权限出错解决方案：

<uses-permission android:name="android.permission.BIND_APPWIDGET" />

int appWidgetId = mAppWidgetHost.allocateAppWidgetId() ;
Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER, mAppWidgetProviderInfo.provider);
startActivityForResult(intent, REQUEST_BIND_APPWIDGET);

callback应用失败： http://www.jb51.net/article/61002.htm callback更新UI时要跑在主线程里面

Android Context 上下文 你必须知道的一切

输入流转化成字符串：

　　　　　　　 resultbuffer = new StringBuffer();
byte[] buffer = new byte[1024];
int bytes;
InputStream mmInStream = null;

try {
if( (bytes = mmInStream.read(buffer)) > 0 )  {
resultbuffer.append(new String(buffer,0,bytes));
}
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}

if视情况改成while

点击二态的标准写法：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_focused="true" android:drawable="@drawable/adduser_btn_pressed1"/>
<item android:state_pressed="true" android:drawable="@drawable/adduser_btn_pressed1"/>
<item android:drawable="@drawable/adduser_btn_nor1"/>

</selector>

另外一种写法：

selector_common_btn.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_focused="true">
<shape >
<corners android:radius="8dp"/>
<solid android:color="#ff33b5e5"/>
</shape>
</item>
<item android:state_pressed="true">

<shape >
<corners android:radius="8dp"/>
<solid android:color="#ff33b5e5"/>
</shape>
</item>
<item >
<shape >
<corners android:radius="8dp"/>
<solid android:color="#FF4ebcd3"/>
</shape>
</item>
</selector>

引用：

<Button
android:id="@+id/loadBtn"
android:textColor="#FFFFFFFF"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:padding="5dp"
android:background="@drawable/selector_common_btn"
android:text="登录" />

效果：



圆形控件：

package com.toyoung.ge.customwidge;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
* Created by yeran on 2015/5/18.
*
* 圆形ImageView控件
*/
public class CustomRoundView extends ImageView {
Paint paint;

public CustomRoundView(Context context) {
super(context);
}

public CustomRoundView(Context paramContext, AttributeSet paramAttributeSet) {
super(paramContext, paramAttributeSet);
}

public CustomRoundView(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {
super(paramContext, paramAttributeSet, paramInt);
}

protected void onDraw(Canvas canvas){
Drawable drawable = getDrawable();
if(drawable==null)
return;
if(getWidth()==0||getHeight()==0)
return;
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
Bitmap bitmap1 = bitmap.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(),h=getHeight();
RoundConnerBitmap rb = new RoundConnerBitmap();
canvas.drawBitmap(rb.toRoundBitmap(bitmap1,w), 0, 0, null);
}

}