android自定义组件实现方法

<?xml version="1.0" encoding="utf-8"?><resources>  <declare-styleable name="TopBar">    <attr name="titleText" format="string"/>    <attr name="titleTextSize" format="dimension"/>    <attr name="titleTextColor" format="color"/>    <attr name="leftText" format="string"/>    <attr name="leftBackground" format="reference|color"/>    <attr name="leftTextColor" format="color"/>    <attr name="rightText" format="string"/>    <attr name="rightBackground" format="reference|color"/>    <attr name="rightTextColor" format="color"/>  </declare-styleable></resources>

package com.cd.administrator.mytopbar;import android.annotation.TargetApi;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.os.Build;import android.util.AttributeSet;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.Toast;/** * Created by Administrator on 2015/1/8. */public class TopBar extends RelativeLayout{  private Button leftButton,rightButton;  private TextView tvTitle;  private int leftTextColor;  private Drawable leftBackground;  private String leftText;  private int rightTextColor;  private Drawable rightBackground;  private String rightText;  private int titleTextColor;  private String titleText;  private float titleTextSize;  private LayoutParams leftParams,rightParams,titleParams;  private topBarClickListener listener;  public interface topBarClickListener{    public void leftClick();    public void rightClick();  }  public void setOnTopBarClickListener(topBarClickListener listener){    this.listener = listener;  }  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)  public TopBar(final Context context, AttributeSet attrs) {    super(context, attrs);    TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.TopBar);    leftTextColor = ta.getColor(R.styleable.TopBar_leftTextColor,0);    leftBackground = ta.getDrawable(R.styleable.TopBar_leftBackground);    leftText = ta.getString(R.styleable.TopBar_leftText);    rightTextColor = ta.getColor(R.styleable.TopBar_rightTextColor,0);    rightBackground = ta.getDrawable(R.styleable.TopBar_rightBackground);    rightText = ta.getString(R.styleable.TopBar_rightText);    titleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor,0);    titleTextSize = ta.getDimension(R.styleable.TopBar_titleTextSize,0);    titleText = ta.getString(R.styleable.TopBar_titleText);    ta.recycle();    leftButton = new Button(context);    rightButton = new Button(context);    tvTitle = new TextView(context);    leftButton.setTextColor(leftTextColor);    leftButton.setBackground(leftBackground);    leftButton.setText(leftText);    rightButton.setTextColor(rightTextColor);    rightButton.setBackground(rightBackground);    rightButton.setText(rightText);    tvTitle.setTextColor(titleTextColor);    tvTitle.setTextSize(titleTextSize);    tvTitle.setText(titleText);    tvTitle.setGravity(Gravity.CENTER);    setBackgroundColor(0xf59563);    leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);    leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT,TRUE);    addView(leftButton,leftParams);    rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);    rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,TRUE);    addView(rightButton,rightParams);    titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);    titleParams.addRule(RelativeLayout.CENTER_IN_PARENT,TRUE);    addView(tvTitle,titleParams);    leftButton.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        listener.leftClick();      }    });    rightButton.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        listener.rightClick();      }    });  }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:custom="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">  <com.cd.administrator.mytopbar.TopBar    android:id="@+id/topBar"    android:layout_width="match_parent"    android:layout_height="40dp"    custom:leftBackground="@drawable/blue"    custom:leftText="Back"    custom:leftTextColor="#ffffff"    custom:rightBackground="@drawable/blue"    custom:rightText="More"    custom:rightTextColor="#ffffff"    custom:titleTextColor="#121212"    custom:titleTextSize="15sp"    custom:titleText="自定义标题">  </com.cd.administrator.mytopbar.TopBar></RelativeLayout>

package com.cd.administrator.mytopbar;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.Toast;public class MainActivity extends ActionBarActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    TopBar topBar = (TopBar) findViewById(R.id.topBar);    topBar.setOnTopBarClickListener(new TopBar.topBarClickListener() {      @Override      public void leftClick() {        Toast.makeText(MainActivity.this, "cd--left", Toast.LENGTH_SHORT).show();      }      @Override      public void rightClick() {        Toast.makeText(MainActivity.this,"cd--right",Toast.LENGTH_SHORT).show();      }    });  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.menu_main, menu);    return true;  }  @Override  public boolean onOptionsItemSelected(MenuItem item) {    // Handle action bar item clicks here. The action bar will    // automatically handle clicks on the Home/Up button, so long    // as you specify a parent activity in AndroidManifest.xml.    int id = item.getItemId();    //noinspection SimplifiableIfStatement    if (id == R.id.action_settings) {      return true;    }    return super.onOptionsItemSelected(item);  }}