Android custom layout and android Layout

Android custom layout and android Layout
1. Create an attribute File

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="topbar">        <attr name="title" format="string"/>        <attr name="titleTextSize" format="dimension" />        <attr name="titleTextColor" format="color" />                <attr name="leftText" format="string"/>        <attr name="leftTextBackgroud"  format="reference|color" />        <attr name="leftTextColor" format="color" />                 <attr name="rightText" format="string"/>        <attr name="rightTextBackgroud"  format="reference|color" />        <attr name="rightTextColor" format="color" />    </declare-styleable></resources>

2. Create a custom Layout class

Public class TopBar extends RelativeLayout {// custom control private Button leftButton, rightButton; private TextView tvTitle; // custom attribute private int leftTextColor; private Drawable leftBackGround; private String leftText; private int rightTextColor; private Drawable rightBackGround; private String rightText; private String titleText; private float titleTextSize; private int titleTextColor; private topBarListener tListener; public void listener (topBarListener tListener) {this. tListener = tListener;} public interface topBarListener {public void clickLeft (); public void clickRight ();} private LayoutParams leftParams, rightParams, titleParams; @ SuppressLint ("NewApi ") public TopBar (Context context, AttributeSet attrs) {super (context, attrs); // TODO Auto-generated constructor stub // get the attribute value TypedArray ta = context. obtainStyledAttributes (attrs, R. styleable. topbar); leftTextColor = ta. getColor (R. styleable. topbar_leftTextColor, 0); leftBackGround = ta. getDrawable (R. styleable. topbar_leftTextBackgroud); leftText = ta. getString (R. styleable. topbar_leftText); rightTextColor = ta. getColor (R. styleable. topbar_rightTextColor, 0); rightBackGround = ta. getDrawable (R. styleable. topbar_rightTextBackgroud); rightText = ta. getString (R. styleable. topbar_rightText); titleText = ta. getString (R. styleable. topbar_title); titleTextSize = ta. getDimension (R. styleable. topbar_titleTextSize, 0); titleTextColor = ta. getColor (R. styleable. topbar_titleTextColor, 0); ta. recycle (); // initialization control leftButton = new Button (context); rightButton = new Button (context); tvTitle = new TextView (context); leftButton. setText (leftText); leftButton. setBackground (leftBackGround); leftButton. setTextColor (leftTextColor); rightButton. setText (rightText); rightButton. setTextColor (rightTextColor); rightButton. setBackground (rightBackGround); tvTitle. setText (titleText); tvTitle. setTextSize (titleTextSize); tvTitle. setTextColor (titleTextColor); tvTitle. setGravity (Gravity. CENTER); setBackgroundColor (0xfff5346); leftParams = new LayoutParams (ViewGroup. layoutParams. WRAP_CONTENT, LayoutParams. WRAP_CONTENT); leftParams. addRule (RelativeLayout. ALIGN_PARENT_LEFT, TRUE); addView (leftButton, leftParams); rightParams = new LayoutParams (ViewGroup. layoutParams. WRAP_CONTENT, LayoutParams. WRAP_CONTENT); rightParams. addRule (RelativeLayout. ALIGN_PARENT_RIGHT, TRUE); addView (rightButton, rightParams); titleParams = new LayoutParams (ViewGroup. layoutParams. WRAP_CONTENT, LayoutParams. MATCH_PARENT); titleParams. addRule (RelativeLayout. CENTER_IN_PARENT, TRUE); addView (tvTitle, titleParams); leftButton. setOnClickListener (new View. onClickListener () {@ Overridepublic void onClick (View arg0) {// TODO Auto-generated method stubtListener. clickLeft () ;}}); rightButton. setOnClickListener (new View. onClickListener () {@ Overridepublic void onClick (View arg0) {// TODO Auto-generated method stubtListener. clickRight ();}});}}

3. Create a listener event and use

public class MainActivity extends Activity {TopBar top  ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);top = (TopBar)findViewById(R.id.myTop);top.settListener(new topBarListener() {@Overridepublic void clickRight() {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "clicked the right Button!", 1000).show();}@Overridepublic void clickLeft() {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "clicked the left Button!", 1000).show();}});}@Overridepublic 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;}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"       xmlns:custom="http://schemas.android.com/apk/res/com.example.topbardemo"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    >    <com.example.topbardemo.TopBar         android:id="@+id/myTop"    android:layout_width="match_parent"    android:layout_height="40dp"    custom:leftText="left"    custom:leftTextColor="#003300"    custom:leftTextBackgroud="#00BFFF"    custom:title="title"    custom:titleTextColor="#000000"    custom:titleTextSize="14sp"    custom:rightText="right"    custom:rightTextColor="#000000"     custom:rightTextBackgroud="#00BFFF">    </com.example.topbardemo.TopBar></RelativeLayout>

Several points of attention: 1, in use need of custom reference value, xmlns: custom = "http://schemas.android.com/apk/res/xxx" xxx is the project package name 2, the use of TypedArray needs to release resources ta. recycle ();
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