Android Streaming layout

Android streaming layout, often used in the history of the search box, people tags and other Android functions, for inexperienced students, to write their own flow layout is really a difficult point, or write out of the custom layout of the running efficiency is not high, here is a very good example of my own collation, take out with you to exchange learning.

1. The Java code of the Flowviewgroup class is as follows

Package Com.snippet.worklearn;

Import Android.content.Context;
Import Android.util.AttributeSet;
Import Android.util.Log;
Import Android.view.View;
Import Android.view.ViewGroup;
Import Android.widget.TextView;

public class Flowviewgroup extends ViewGroup {
Private final static String TAG = "MyViewGroup2";

Private final static int view_margin = 0;

Public Flowviewgroup (Context context) {
Super (context);
}

Public Flowviewgroup (context context, AttributeSet Attrs) {
Super (context, attrs);
}

@Override
protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {
LOG.D (TAG, "widthmeasurespec =" + Widthmeasurespec
+ "Heightmeasurespec" + heightmeasurespec);

for (int index = 0; index < Getchildcount (); index++) {
Final View child = Getchildat (index);
Measure
Child.measure (measurespec.unspecified, measurespec.unspecified);
//        }

int measurewidth = Measurewidth (Widthmeasurespec);
int measureheight = Measureheight (Heightmeasurespec);

Measurechildren (Widthmeasurespec, Heightmeasurespec);
Setmeasureddimension (Measurewidth, measureheight);

Super.onmeasure (Widthmeasurespec, Heightmeasurespec);
}

@Override
protected void OnLayout (Boolean arg0, int arg1, int arg2, int arg3, int arg4) {
Final int count = Getchildcount ();
int row = 0;
int left = Arg1;
int top = ARG2;
int right = ARG3;
int bottom = ARG4;
for (int i = 0; i < count; i++) {

Final View child = This.getchildat (i);
String Text = ((TextView) child). GetText (). toString ();

LOG.E (TAG, text+ "onlayout =" + arg0 + "left =" + Arg1 + "top =" + Arg2 + "right =" + Arg3 + "Botom =" + Arg4);

int width = child.getmeasuredwidth ();
int height = child.getmeasuredheight ();

LOG.E ("----1-----", "width=" +width+ ", height=" +height + ", measuredwidth=" + child.getmeasuredwidth () + ", paddingleft = "+child.getpaddingleft ()
+ ", paddingright=" + child.getpaddingright ());

LOG.E ("----22--before calculation---", "left=" +left+ ", right=" + Right + ", top=" +top ");
Left + + width + view_margin;
top = row * (height + view_margin) + view_margin + height + arg2;

LOG.E ("----33--after calculation---", "left=" +left+ ", right=" + Right + ", top=" +top ");

if (Left > right) {
left = width + view_margin + arg1;
row++;
top = row * (height + view_margin) + view_margin + height + arg2;
}

LOG.E ("----4444-----", "left=" + (Left-width) + ", top=" + (Top-height) + ", right=" + Left + ", bottom=" +top ";
Child.layout (Left-width-arg1, Top-height, LEFT-ARG1, top);
}

}

private int measurewidth (int pwidthmeasurespec) {
int result = 0;
int widthmode = Measurespec.getmode (PWIDTHMEASURESPEC);//Get mode
int widthsize = measurespec.getsize (PWIDTHMEASURESPEC);//Get size

Switch (widthmode) {
/**
* Mode A total of three cases, the value is measurespec.unspecified, measurespec.exactly,
* Measurespec.at_most.
*
*
* measurespec.exactly is the exact size,
* When we specify the Layout_width or Layout_height of a control as a specific value, such as Andorid
*: Layout_width= "50dip", or fill_parent Yes, is the size of the control has been determined, is the exact size.
*
*
* Measurespec.at_most is the largest size,
* When the layout_width or layout_height of a control is specified as Wrap_content
*, the size of the control generally varies with the control's subspace or content, so that the control size does not exceed the maximum size allowed by the parent control
* 。 Therefore, mode at this point is at_most,size gives the maximum size allowed by the parent control.
*
*
* Measurespec.unspecified is not a specified size, this situation is not much, is generally the parent control is Adapterview,
* The mode passed through the measure method.
*/
Case Measurespec.at_most:
Case measurespec.exactly:
result = Widthsize;
Break
}
return result;
}

private int measureheight (int pheightmeasurespec) {
int result = 0;

int heightmode = Measurespec.getmode (Pheightmeasurespec);
int heightsize = measurespec.getsize (Pheightmeasurespec);

Switch (heightmode) {
Case Measurespec.at_most:
Case measurespec.exactly:
result = Heightsize;
Break
}
return result;
}

}

2. The following methods are used in the XML file:

<?xml version= "1.0" encoding= "Utf-8"?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:orientation= "Vertical"
android:paddingleft= "20DP"
android:paddingright= "20DP" >

<com.snippet.worklearn.flowviewgroup
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:visibility= "Visible"
android:background= "#f0f" >

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
Android:gravity= "Center_vertical"
android:paddingleft= "20DP"
android:paddingright= "10DP"
android:text= "Two words"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
Android:text= "three characters"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
Android:text= "This is four words"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
android:text= "Five words exceed No"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
android:text= "Meche 345678"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
android:text= "One"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
Android:text= "Six words should be newline"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
Android:text= "Seven words must have changed"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
Android:text= "What's the result"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
android:text= "One"/>

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:background= "@drawable/aaa"
android:gravity= "Center"
android:text= "hehe"/>
</com.snippet.worklearn.MyViewGroup2>

</LinearLayout>

3. Operation:

Android Streaming layout