标签：encoding 开发 .post 布局 重写 charles type 应该 综合
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大家好啊！好久没有见到我了吧！为什么呢！当然是因为开学啦，这学期很多课，身为部长实验室也也很多活动和一堆小师弟，同时还有蓝桥杯和华为软件开发大赛，而且最近在做一个综合性比较高的作品，没错了，就是酷云，一款仿网易云音乐的在线播放器。当然了，现在我还没有完成这个作品，而且只是刚刚开始写而已，不过也遇到了很多坑，所以写下这篇文章来记录一下这次开发中各种各样的坑，希望对各位有所帮助，文章会随着我的开发进度而不定期更新，各位有问题也可以给我发私信，我们一起讨论解决。
不知道各位有没有体验过网易云音乐APP,通过我最近的体验，发现它有着很好的用户界面，对各种操作都有着很好的响应，大家可以先去体验一下，下面给出几张网易云音乐的UI。
接下来放上酷云相对应的页面
说实话从开始接触自定义View到现在也不久，学的不多，但是比较喜欢挑战，因此便有了这个项目的开始。好了，相信大家也已经体验过网易云的用户界面了，就算没有，接下来我也会一点点为你解答。
进去网易云后，主界面如下一个最大的特点就是滑动切屏了，这个效果既方便又帅气，所以网易云音乐中大量应用了这一效果，那么我们首先便来讲解一下滑动切屏的实现。
首先构建在activity_main.xml中构建ViewPager，代码如下：
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:id="@+id/vp">
<android.support.v4.view.PagerTabStrip
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tap">
</android.support.v4.view.PagerTabStrip>
</android.support.v4.view.ViewPager>然后构建切换的子View，为了方便颜色，这里简单的设置显示不同的颜色，main_layout_1
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/view_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#76ff03"/>
</LinearLayout>然后在Activity中进行设置，MainActivity.java
package com.androxue.coolcloud.activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.androxue.coolcloud.R;
import java.util.ArrayList;
/**
* Created by JimCharles on 2017/3/11.
*/
public class MainActivity extends AppCompatActivity {
private ViewPager vp;
//声明存储ViewPager下子视图的集合
ArrayList<View> views = new ArrayList<>();
//显示效果中每个视图的标题
String[] titles={"私信", "评论", "@我", "通知"};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
vp = (ViewPager) findViewById(R.id.vp);
initView();//调用初始化视图方法
vp.setAdapter(new MyAdapter());//设置适配器
ImageView back = (ImageView) findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MessageActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
//初始化视图的方法（通过布局填充器获取用于滑动的视图并存入对应的的集合）
private void initView() {
View v1 = getLayoutInflater().inflate(R.layout.main_layout_1, null);
View v2 = getLayoutInflater().inflate(R.layout.main_layout_2, null);
View v3 = getLayoutInflater().inflate(R.layout.main_layout_3, null);
View v4 = getLayoutInflater().inflate(R.layout.main_layout_4, null);
views.add(v1);
views.add(v2);
views.add(v3);
views.add(v4);
PagerTabStrip pagerTabStrip= (PagerTabStrip)findViewById(R.id.tap);
pagerTabStrip.setDrawFullUnderline(false);//取消标题栏子View之间的分割线
pagerTabStrip.setTabIndicatorColor(Color.RED);//改变指示器颜色为红色
pagerTabStrip.setTextColor(Color.RED);//该变字体颜色为红色
}
private class MyAdapter extends PagerAdapter {
@Override
public int getCount() {
return views.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
//重写销毁滑动视图布局（将子视图移出视图存储集合（ViewGroup））
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(views.get(position));
}
//重写初始化滑动视图布局（从视图集合中取出对应视图，添加到ViewGroup）
@Override
public Object instantiateItem(ViewGroup container, int position) {
View v = views.get(position);
container.addView(v);
return v;
}
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
}
}
好了，一个滑动切屏的功能就这样完成了。
关于圆形头像的实现在之前Android自定义View之draw原理分析一文已经有讲到，这里简单的讲解一下，顺便讲解另一种实现方式，两种方式都是通过自定义View控件来实现的。
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setAntiAlias(true);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.girl);
int radius = bitmap.getWidth()/2;
BitmapShader bitmapShader = new BitmapShader(bitmap,Shader.TileMode.REPEAT,Shader.TileMode.REPEAT);
paint.setShader(bitmapShader);
canvas.translate(250,430);
canvas.drawCircle(radius, radius, radius, paint);
}package com.androxue.coolcloud.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.support.annotation.ColorInt;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.util.AttributeSet;
import com.androxue.coolcloud.R;
/**
* Created by JimCharles on 2017/3/9.
*/
public class CircleImageView extends android.support.v7.widget.AppCompatImageView {
private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;
private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
private static final int COLORDRAWABLE_DIMENSION = 2;
private static final int DEFAULT_BORDER_WIDTH = 0;
private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
private static final int DEFAULT_FILL_COLOR = Color.TRANSPARENT;
private static final boolean DEFAULT_BORDER_OVERLAY = false;
private final RectF mDrawableRect = new RectF();
private final RectF mBorderRect = new RectF();
private final Matrix mShaderMatrix = new Matrix();
private final Paint mBitmapPaint = new Paint();
private final Paint mBorderPaint = new Paint();
private final Paint mFillPaint = new Paint();
private int mBorderColor = DEFAULT_BORDER_COLOR;
private int mBorderWidth = DEFAULT_BORDER_WIDTH;
private int mFillColor = DEFAULT_FILL_COLOR;
private Bitmap mBitmap;
private BitmapShader mBitmapShader;
private int mBitmapWidth;
private int mBitmapHeight;
private float mDrawableRadius;
private float mBorderRadius;
private ColorFilter mColorFilter;
private boolean mReady;
private boolean mSetupPending;
private boolean mBorderOverlay;
private boolean mDisableCircularTransformation;
public CircleImageView(Context context) {
super(context);
init();
}
public CircleImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);
mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);
mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);
mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);
a.recycle();
init();
}
private void init() {
super.setScaleType(SCALE_TYPE);
mReady = true;
if (mSetupPending) {
setup();
mSetupPending = false;
}
}
@Override
public ScaleType getScaleType() {
return SCALE_TYPE;
}
@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType != SCALE_TYPE) {
throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
}
}
@Override
public void setAdjustViewBounds(boolean adjustViewBounds) {
if (adjustViewBounds) {
throw new IllegalArgumentException("adjustViewBounds not supported.");
}
}
@Override
protected void onDraw(Canvas canvas) {
if (mDisableCircularTransformation) {
super.onDraw(canvas);
return;
}
if (mBitmap == null) {
return;
}
if (mFillColor != Color.TRANSPARENT) {
canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mFillPaint);
}
canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);
if (mBorderWidth > 0) {
canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
setup();
}
@Override
public void setPadding(int left, int top, int right, int bottom) {
super.setPadding(left, top, right, bottom);
setup();
}
@Override
public void setPaddingRelative(int start, int top, int end, int bottom) {
super.setPaddingRelative(start, top, end, bottom);
setup();
}
public int getBorderColor() {
return mBorderColor;
}
public void setBorderColor(@ColorInt int borderColor) {
if (borderColor == mBorderColor) {
return;
}
mBorderColor = borderColor;
mBorderPaint.setColor(mBorderColor);
invalidate();
}
/**
* @deprecated Use {@link #setBorderColor(int)} instead
*/
@Deprecated
public void setBorderColorResource(@ColorRes int borderColorRes) {
setBorderColor(getContext().getResources().getColor(borderColorRes));
}
/**
* Return the color drawn behind the circle-shaped drawable.
*
* @return The color drawn behind the drawable
*
* @deprecated Fill color support is going to be removed in the future
*/
@Deprecated
public int getFillColor() {
return mFillColor;
}
/**
* Set a color to be drawn behind the circle-shaped drawable. Note that
* this has no effect if the drawable is opaque or no drawable is set.
*
* @param fillColor The color to be drawn behind the drawable
*
* @deprecated Fill color support is going to be removed in the future
*/
@Deprecated
public void setFillColor(@ColorInt int fillColor) {
if (fillColor == mFillColor) {
return;
}
mFillColor = fillColor;
mFillPaint.setColor(fillColor);
invalidate();
}
/**
* Set a color to be drawn behind the circle-shaped drawable. Note that
* this has no effect if the drawable is opaque or no drawable is set.
*
* @param fillColorRes The color resource to be resolved to a color and
* drawn behind the drawable
*
* @deprecated Fill color support is going to be removed in the future
*/
@Deprecated
public void setFillColorResource(@ColorRes int fillColorRes) {
setFillColor(getContext().getResources().getColor(fillColorRes));
}
public int getBorderWidth() {
return mBorderWidth;
}
public void setBorderWidth(int borderWidth) {
if (borderWidth == mBorderWidth) {
return;
}
mBorderWidth = borderWidth;
setup();
}
public boolean isBorderOverlay() {
return mBorderOverlay;
}
public void setBorderOverlay(boolean borderOverlay) {
if (borderOverlay == mBorderOverlay) {
return;
}
mBorderOverlay = borderOverlay;
setup();
}
public boolean isDisableCircularTransformation() {
return mDisableCircularTransformation;
}
public void setDisableCircularTransformation(boolean disableCircularTransformation) {
if (mDisableCircularTransformation == disableCircularTransformation) {
return;
}
mDisableCircularTransformation = disableCircularTransformation;
initializeBitmap();
}
@Override
public void setImageBitmap(Bitmap bm) {
super.setImageBitmap(bm);
initializeBitmap();
}
@Override
public void setImageDrawable(Drawable drawable) {
super.setImageDrawable(drawable);
initializeBitmap();
}
@Override
public void setImageResource(@DrawableRes int resId) {
super.setImageResource(resId);
initializeBitmap();
}
@Override
public void setImageURI(Uri uri) {
super.setImageURI(uri);
initializeBitmap();
}
@Override
public void setColorFilter(ColorFilter cf) {
if (cf == mColorFilter) {
return;
}
mColorFilter = cf;
applyColorFilter();
invalidate();
}
@Override
public ColorFilter getColorFilter() {
return mColorFilter;
}
private void applyColorFilter() {
if (mBitmapPaint != null) {
mBitmapPaint.setColorFilter(mColorFilter);
}
}
private Bitmap getBitmapFromDrawable(Drawable drawable) {
if (drawable == null) {
return null;
}
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
try {
Bitmap bitmap;
if (drawable instanceof ColorDrawable) {
bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
} else {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private void initializeBitmap() {
if (mDisableCircularTransformation) {
mBitmap = null;
} else {
mBitmap = getBitmapFromDrawable(getDrawable());
}
setup();
}
private void setup() {
if (!mReady) {
mSetupPending = true;
return;
}
if (getWidth() == 0 && getHeight() == 0) {
return;
}
if (mBitmap == null) {
invalidate();
return;
}
mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setShader(mBitmapShader);
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(mBorderColor);
mBorderPaint.setStrokeWidth(mBorderWidth);
mFillPaint.setStyle(Paint.Style.FILL);
mFillPaint.setAntiAlias(true);
mFillPaint.setColor(mFillColor);
mBitmapHeight = mBitmap.getHeight();
mBitmapWidth = mBitmap.getWidth();
mBorderRect.set(calculateBounds());
mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);
mDrawableRect.set(mBorderRect);
if (!mBorderOverlay && mBorderWidth > 0) {
mDrawableRect.inset(mBorderWidth - 1.0f, mBorderWidth - 1.0f);
}
mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);
applyColorFilter();
updateShaderMatrix();
invalidate();
}
private RectF calculateBounds() {
int availableWidth = getWidth() - getPaddingLeft() - getPaddingRight();
int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();
int sideLength = Math.min(availableWidth, availableHeight);
float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;
float top = getPaddingTop() + (availableHeight - sideLength) / 2f;
return new RectF(left, top, left + sideLength, top + sideLength);
}
private void updateShaderMatrix() {
float scale;
float dx = 0;
float dy = 0;
mShaderMatrix.set(null);
if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
scale = mDrawableRect.height() / (float) mBitmapHeight;
dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
} else {
scale = mDrawableRect.width() / (float) mBitmapWidth;
dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
}
mShaderMatrix.setScale(scale, scale);
mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);
mBitmapShader.setLocalMatrix(mShaderMatrix);
}
}
关于夜间模式的实现是在我开发过程中遇到的一个比较大坑，但我们都知道夜间模式是一款APP应该具备的，通过我最近的了解，总结出了两种实现方式。一是定义两套主题，对每一个需要实现夜间模式的控件都另外定义一套夜间主题，但这样子工程量大，我是一个人开发的，所以并没有采用这种方式；二是调用开源框架。
标签：encoding 开发 .post 布局 重写 charles type 应该 综合
原文地址：http://blog.csdn.net/jim__charles/article/details/61429714
