效果圖

原理介紹

1、先繪制一個顏色（例如：粉紅）
2、設置Mode=DST_IN
3、繪制我們這個可愛的小機器人
回答我，顯示什么，是不是顯示交集，交集是什么？交集是我們的小機器人的非透明區域，也就是那張臉，除了兩個眼；
好了，那怎么變色呢？
我繪制一個顏色的時候，難道不能設置alpha么

自定義圖標控件

自定義屬性

<?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>

繪制圖標

繪制圖標有很多步驟呀，我來列一列
1、計算alpha（默認為0）
2、繪制原圖
3、在繪圖區域，繪制一個純色塊（設置了alpha），此步繪制在內存的bitmap上
4、設置mode，針對內存中的bitmap上的paint
5、繪制我們的圖標，此步繪制在內存的bitmap上
6、繪制原文本
7、繪制設置alpha和顏色后的文本
8、將內存中的bitmap繪制出來
根據上面的步驟，可以看出來，我們的圖標其實繪制了兩次，為什么要繪制原圖呢，因為我覺得比較好看。
3-5步驟，就是我們上面分析的原理
6-7步，是繪制文本，可以看到，我們的文本就是通過設置alpha實現的

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;/*** 顏色*/private int mColor = 0xFF45C01A;/*** 透明度 0.0-1.0*/private float mAlpha = 0f;/*** 圖標*/private Bitmap mIconBitmap;/*** 限制繪制icon的范圍*/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);}/*** 初始化自定義屬性值* * @param context* @param attrs*/public ChangeColorIconWithTextView(Context context, AttributeSet attrs){super(context, attrs);// 獲取設置的圖標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繪制范圍mTextPaint.getTextBounds(mText, 0, mText.length(), mTextBound);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){super.onMeasure(widthMeasureSpec, heightMeasureSpec);// 得到繪制icon的寬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;// 設置icon的繪制范圍mIconRect = new Rect(left, top, left + bitmapWidth, top + bitmapWidth);}@Overrideprotected 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";@Overrideprotected Parcelable onSaveInstanceState(){Bundle bundle = new Bundle();bundle.putParcelable(INSTANCE_STATE, super.onSaveInstanceState());bundle.putFloat(STATE_ALPHA, mAlpha);return bundle;}@Overrideprotected 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 implementsOnPageChangeListener, 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>();@Overrideprotected 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()){@Overridepublic int getCount(){return mTabs.size();}@Overridepublic Fragment getItem(int arg0){return mTabs.get(arg0);}};initTabIndicator();}SearchView searchView;@Overridepublic boolean onCreateOptionsMenu(Menu menu){getMenuInflater().inflate(R.menu.main, menu);MenuItem searchItem = menu.findItem(R.id.action_search); searchView = (SearchView) searchItem.getActionView(); return true;}@Overridepublic boolean onSearchRequested() {// TODO Auto-generated method stubToast.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);}@Overridepublic void onPageSelected(int arg0){}@Overridepublic 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);}}@Overridepublic void onPageScrollStateChanged(int state){}@Overridepublic 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);}}@Overridepublic 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里面代碼雖然沒什么注釋，但是很簡單哈，就是初始化Fragment，得到我們的適配器，然后設置給ViewPager；
initTabIndicator我們初始化我們的自定義控件，以及加上了點擊事件；
唯一一個需要指出的就是：
我們在onPageScrolled中，動態的獲取position以及positionOffset，然后拿到左右兩個View，設置positionOffset ；

兩個反射的方法，是控制Actionbar的圖標的，和點擊menu按鍵顯示的

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

源碼下載

源碼下載

參考鏈接

Android 高仿微信6.0主界面 帶你玩轉切換圖標變色 - Hongyang - 博客頻道 - CSDN.NET
http://blog.csdn.net/lmj623565791/article/details/41087219

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