Android仿微信界面

2022-07-24 12:21 107阅读 0赞

### 效果图 ###

![20141113215629968][]

### 原理介绍 ###

![Center][]

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 ###

### 源码下载 ###

[源码下载][Link 1]

### 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

[20141113215629968]: /images/20220722/8f211232614744b492001854f71755c9.png
[Center]: /images/20220722/6f02f5176ae141168f29b0afd07d3502.png
[Link 1]: http://download.csdn.net/detail/lmj623565791/8155321