Android仿微信界面

效果图

原理介绍

1、先绘制一个颜色（例如：粉红）
2、设置Mode=DST_IN
3、绘制我们这个可爱的小机器人
回答我，显示什么，是不是显示交集，交集是什么？交集是我们的小机器人的非透明区域，也就是那张脸，除了两个眼；
好了，那怎么变色呢？
我绘制一个颜色的时候，难道不能设置alpha么

自定义图标控件

自定义属性

<?xml version="1.0" encoding="utf-8"?>  <resources>      <attr name="icon" format="reference" />      <attr name="color" format="color" />      <attr name="text" format="string" />      <attr name="text_size" format="dimension" />      <declare-styleable name="ChangeColorIconView">          <attr name="icon" />          <attr name="color" />          <attr name="text" />          <attr name="text_size" />      </declare-styleable>  </resources>  

绘制图标

绘制图标有很多步骤呀，我来列一列
1、计算alpha（默认为0）
2、绘制原图
3、在绘图区域，绘制一个纯色块（设置了alpha），此步绘制在内存的bitmap上
4、设置mode，针对内存中的bitmap上的paint
5、绘制我们的图标，此步绘制在内存的bitmap上
6、绘制原文本
7、绘制设置alpha和颜色后的文本
8、将内存中的bitmap绘制出来
根据上面的步骤，可以看出来，我们的图标其实绘制了两次，为什么要绘制原图呢，因为我觉得比较好看。
3-5步骤，就是我们上面分析的原理
6-7步，是绘制文本，可以看到，我们的文本就是通过设置alpha实现的

package com.zhy.weixin6.ui;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.os.Looper;import android.os.Parcelable;import android.util.AttributeSet;import android.util.Log;import android.util.TypedValue;import android.view.View;public class ChangeColorIconWithTextView extends View{    private Bitmap mBitmap;    private Canvas mCanvas;    private Paint mPaint;    /**     * 颜色     */    private int mColor = 0xFF45C01A;    /**     * 透明度 0.0-1.0     */    private float mAlpha = 0f;    /**     * 图标     */    private Bitmap mIconBitmap;    /**     * 限制绘制icon的范围     */    private Rect mIconRect;    /**     * icon底部文本     */    private String mText = "微信";    private int mTextSize = (int) TypedValue.applyDimension(            TypedValue.COMPLEX_UNIT_SP, 10, getResources().getDisplayMetrics());    private Paint mTextPaint;    private Rect mTextBound = new Rect();    public ChangeColorIconWithTextView(Context context)    {        super(context);    }    /**     * 初始化自定义属性值     *      * @param context     * @param attrs     */    public ChangeColorIconWithTextView(Context context, AttributeSet attrs)    {        super(context, attrs);        // 获取设置的图标        TypedArray a = context.obtainStyledAttributes(attrs,                R.styleable.ChangeColorIconView);        int n = a.getIndexCount();        for (int i = 0; i < n; i++)        {            int attr = a.getIndex(i);            switch (attr)            {            case R.styleable.ChangeColorIconView_icon:                BitmapDrawable drawable = (BitmapDrawable) a.getDrawable(attr);                mIconBitmap = drawable.getBitmap();                break;            case R.styleable.ChangeColorIconView_color:                mColor = a.getColor(attr, 0x45C01A);                break;            case R.styleable.ChangeColorIconView_text:                mText = a.getString(attr);                break;            case R.styleable.ChangeColorIconView_text_size:                mTextSize = (int) a.getDimension(attr, TypedValue                        .applyDimension(TypedValue.COMPLEX_UNIT_SP, 10,                                getResources().getDisplayMetrics()));                break;            }        }        a.recycle();        mTextPaint = new Paint();        mTextPaint.setTextSize(mTextSize);        mTextPaint.setColor(0xff555555);        // 得到text绘制范围        mTextPaint.getTextBounds(mText, 0, mText.length(), mTextBound);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)    {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        // 得到绘制icon的宽        int bitmapWidth = Math.min(getMeasuredWidth() - getPaddingLeft()                - getPaddingRight(), getMeasuredHeight() - getPaddingTop()                - getPaddingBottom() - mTextBound.height());        int left = getMeasuredWidth() / 2 - bitmapWidth / 2;        int top = (getMeasuredHeight() - mTextBound.height()) / 2 - bitmapWidth                / 2;        // 设置icon的绘制范围        mIconRect = new Rect(left, top, left + bitmapWidth, top + bitmapWidth);    }    @Override    protected void onDraw(Canvas canvas)    {        int alpha = (int) Math.ceil((255 * mAlpha));        canvas.drawBitmap(mIconBitmap, null, mIconRect, null);        setupTargetBitmap(alpha);        drawSourceText(canvas, alpha);        drawTargetText(canvas, alpha);        canvas.drawBitmap(mBitmap, 0, 0, null);    }    private void setupTargetBitmap(int alpha)    {        mBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),                Config.ARGB_8888);        mCanvas = new Canvas(mBitmap);        mPaint = new Paint();        mPaint.setColor(mColor);        mPaint.setAntiAlias(true);        mPaint.setDither(true);        mPaint.setAlpha(alpha);        mCanvas.drawRect(mIconRect, mPaint);        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));        mPaint.setAlpha(255);        mCanvas.drawBitmap(mIconBitmap, null, mIconRect, mPaint);    }    private void drawSourceText(Canvas canvas, int alpha)    {        mTextPaint.setTextSize(mTextSize);        mTextPaint.setColor(0xff333333);        mTextPaint.setAlpha(255 - alpha);        canvas.drawText(mText, mIconRect.left + mIconRect.width() / 2                - mTextBound.width() / 2,                mIconRect.bottom + mTextBound.height(), mTextPaint);    }    private void drawTargetText(Canvas canvas, int alpha)    {        mTextPaint.setColor(mColor);        mTextPaint.setAlpha(alpha);        canvas.drawText(mText, mIconRect.left + mIconRect.width() / 2                - mTextBound.width() / 2,                mIconRect.bottom + mTextBound.height(), mTextPaint);    }    public void setIconAlpha(float alpha)    {        this.mAlpha = alpha;        invalidateView();    }    private void invalidateView()    {        if (Looper.getMainLooper() == Looper.myLooper())        {            invalidate();        } else        {            postInvalidate();        }    }    public void setIconColor(int color)    {        mColor = color;    }    public void setIcon(int resId)    {        this.mIconBitmap = BitmapFactory.decodeResource(getResources(), resId);        if (mIconRect != null)            invalidateView();    }    public void setIcon(Bitmap iconBitmap)    {        this.mIconBitmap = iconBitmap;        if (mIconRect != null)            invalidateView();    }    private static final String INSTANCE_STATE = "instance_state";    private static final String STATE_ALPHA = "state_alpha";    @Override    protected Parcelable onSaveInstanceState()    {        Bundle bundle = new Bundle();        bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState());        bundle.putFloat(STATE_ALPHA, mAlpha);        return bundle;    }    @Override    protected void onRestoreInstanceState(Parcelable state)    {        if (state instanceof Bundle)        {            Bundle bundle = (Bundle) state;            mAlpha = bundle.getFloat(STATE_ALPHA);            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATE));        } else        {            super.onRestoreInstanceState(state);        }    }}

MainActivity

package com.zhy.weixin6.ui;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.List;import android.annotation.SuppressLint;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewConfiguration;import android.view.Window;import android.widget.SearchView;import android.widget.Toast;@SuppressLint("NewApi")public class MainActivity extends FragmentActivity implements        OnPageChangeListener, OnClickListener{    private ViewPager mViewPager;    private List<Fragment> mTabs = new ArrayList<Fragment>();    private FragmentPagerAdapter mAdapter;    private String[] mTitles = new String[] { "First Fragment!",            "Second Fragment!", "Third Fragment!", "Fourth Fragment!" };    private List<ChangeColorIconWithTextView> mTabIndicator = new ArrayList<ChangeColorIconWithTextView>();    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        setOverflowShowingAlways();        getActionBar().setDisplayShowHomeEnabled(false);        mViewPager = (ViewPager) findViewById(R.id.id_viewpager);        initDatas();        mViewPager.setAdapter(mAdapter);        mViewPager.setOnPageChangeListener(this);    }    private void initDatas()    {        for (String title : mTitles)        {            TabFragment tabFragment = new TabFragment();            Bundle args = new Bundle();            args.putString("title", title);            tabFragment.setArguments(args);            mTabs.add(tabFragment);        }        mAdapter = new FragmentPagerAdapter(getSupportFragmentManager())        {            @Override            public int getCount()            {                return mTabs.size();            }            @Override            public Fragment getItem(int arg0)            {                return mTabs.get(arg0);            }        };        initTabIndicator();    }     SearchView searchView;    @Override    public boolean onCreateOptionsMenu(Menu menu)    {        getMenuInflater().inflate(R.menu.main, menu);        MenuItem searchItem = menu.findItem(R.id.action_search);           searchView = (SearchView) searchItem.getActionView();          return true;    }    @Override    public boolean onSearchRequested() {        // TODO Auto-generated method stub        Toast.makeText(getApplicationContext(), searchView.getQuery(), 0).show();        return super.onSearchRequested();    }    private void initTabIndicator()    {        ChangeColorIconWithTextView one = (ChangeColorIconWithTextView) findViewById(R.id.id_indicator_one);        ChangeColorIconWithTextView two = (ChangeColorIconWithTextView) findViewById(R.id.id_indicator_two);        ChangeColorIconWithTextView three = (ChangeColorIconWithTextView) findViewById(R.id.id_indicator_three);        ChangeColorIconWithTextView four = (ChangeColorIconWithTextView) findViewById(R.id.id_indicator_four);        mTabIndicator.add(one);        mTabIndicator.add(two);        mTabIndicator.add(three);        mTabIndicator.add(four);        one.setOnClickListener(this);        two.setOnClickListener(this);        three.setOnClickListener(this);        four.setOnClickListener(this);        one.setIconAlpha(1.0f);    }    @Override    public void onPageSelected(int arg0)    {    }    @Override    public void onPageScrolled(int position, float positionOffset,            int positionOffsetPixels)    {        // Log.e("TAG", "position = " + position + " , positionOffset = "        // + positionOffset);        if (positionOffset > 0)        {            ChangeColorIconWithTextView left = mTabIndicator.get(position);            ChangeColorIconWithTextView right = mTabIndicator.get(position + 1);            left.setIconAlpha(1 - positionOffset);            right.setIconAlpha(positionOffset);        }    }    @Override    public void onPageScrollStateChanged(int state)    {    }    @Override    public void onClick(View v)    {        resetOtherTabs();        switch (v.getId())        {        case R.id.id_indicator_one:            mTabIndicator.get(0).setIconAlpha(1.0f);            mViewPager.setCurrentItem(0, false);            break;        case R.id.id_indicator_two:            mTabIndicator.get(1).setIconAlpha(1.0f);            mViewPager.setCurrentItem(1, false);            break;        case R.id.id_indicator_three:            mTabIndicator.get(2).setIconAlpha(1.0f);            mViewPager.setCurrentItem(2, false);            break;        case R.id.id_indicator_four:            mTabIndicator.get(3).setIconAlpha(1.0f);            mViewPager.setCurrentItem(3, false);            break;        }    }    /**     * 重置其他的Tab     */    private void resetOtherTabs()    {        for (int i = 0; i < mTabIndicator.size(); i++)        {            mTabIndicator.get(i).setIconAlpha(0);        }    }    @Override    public boolean onMenuOpened(int featureId, Menu menu)    {        if (featureId == Window.FEATURE_ACTION_BAR && menu != null)        {            if (menu.getClass().getSimpleName().equals("MenuBuilder"))            {                try                {                    Method m = menu.getClass().getDeclaredMethod(                            "setOptionalIconsVisible", Boolean.TYPE);                    m.setAccessible(true);                    m.invoke(menu, true);                } catch (Exception e)                {                }            }        }        return super.onMenuOpened(featureId, menu);    }    private void setOverflowShowingAlways()    {        try        {            // true if a permanent menu key is present, false otherwise.            ViewConfiguration config = ViewConfiguration.get(this);            Field menuKeyField = ViewConfiguration.class                    .getDeclaredField("sHasPermanentMenuKey");            menuKeyField.setAccessible(true);            menuKeyField.setBoolean(config, false);        } catch (Exception e)        {            e.printStackTrace();        }    }}

Activity里面代码虽然没什么注释，但是很简单哈，就是初始化Fragment，得到我们的适配器，然后设置给ViewPager；
initTabIndicator我们初始化我们的自定义控件，以及加上了点击事件；
唯一一个需要指出的就是：
我们在onPageScrolled中，动态的获取position以及positionOffset，然后拿到左右两个View，设置positionOffset ；

两个反射的方法，是控制Actionbar的图标的，和点击menu按键显示的

TabFragment

package com.zhy.weixin6.ui;  import android.graphics.Color;  import android.os.Bundle;  import android.support.v4.app.Fragment;  import android.view.Gravity;  import android.view.LayoutInflater;  import android.view.View;  import android.view.ViewGroup;  import android.widget.TextView;  public class TabFragment extends Fragment  {      private String mTitle = "Default";      public TabFragment()      {      }      @Override      public View onCreateView(LayoutInflater inflater, ViewGroup container,              Bundle savedInstanceState)      {          if (getArguments() != null)          {              mTitle = getArguments().getString("title");          }          TextView textView = new TextView(getActivity());          textView.setTextSize(20);          textView.setBackgroundColor(Color.parseColor("#ffffffff"));          textView.setGravity(Gravity.CENTER);          textView.setText(mTitle);          return textView;      }  }  

menu.xml文件

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:id="@+id/action_search"        android:actionViewClass="android.widget.SearchView"        android:icon="@drawable/actionbar_search_icon"        android:showAsAction="ifRoom|collapseActionView"        android:title="@string/action_search"/>    <item        android:id="@+id/action_group_chat"        android:icon="@drawable/ofm_group_chat_icon"        android:title="@string/action_group_chat"/>    <item        android:id="@+id/action_add_friend"        android:icon="@drawable/ofm_add_icon"        android:title="@string/action_add_friend"/>    <item        android:id="@+id/action_scan"        android:icon="@drawable/ofm_qrcode_icon"        android:title="@string/action_scan"/>    <item        android:id="@+id/action_feed"        android:icon="@drawable/ofm_feedback_icon"        android:title="@string/action_feed"/></menu>

源码下载

源码下载

参考链接

Android 高仿微信6.0主界面 带你玩转切换图标变色 - Hongyang - 博客频道 - CSDN.NET
http://blog.csdn.net/lmj623565791/article/details/41087219