完美解决修改ToolBar高度的问题

来源：互联网发布：钣金下料软件编辑：程序博客网时间：2024/05/16 19:10

android系统中ToolBar的高度是默认的，貌似google不希望我们能修改这个控件的高度，我们可以在xml中修改ToolBar的高度，可是这样的结果我们可以看出来，天啊！ToolBar布局里边的控件全部都乱套了，布局混乱了。这显然是我们不能接受的，其实我们在开发过程中是不用修改这个控件的，但是我们知道一般公司的设计师只会出一套设计图，而且还是IOS的，IOS默认的ToolBar高度是44dp，而android<dimen name="abc_action_bar_default_height_material">56dp</dimen>。可以看出是56dp。给人感觉是要高的多。所以我们强迫症出来了，要修改这个控件，那么今天就给大家一个自定义的完美解决高度的ToolBar控件。直接上代码：

package com.hdceping.www.feirunning.view.custom;import android.content.Context;import android.graphics.drawable.Drawable;import android.support.annotation.ColorInt;import android.support.annotation.Nullable;import android.support.v4.media.RatingCompat;import android.support.v7.app.ActionBar;import android.support.v7.widget.TintTypedArray;import android.support.v7.widget.Toolbar;import android.text.TextUtils;import android.util.AttributeSet;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.hdceping.www.feirunning.R;import java.lang.reflect.Field;/** * Created by 晁东洋 on 2016/10/28. */public class MyToolbar extends Toolbar {    private TextView mTitleTextView;    private CharSequence mTitleText;    private int mTitleTextColor;    private int mTitleTextAppearance;    public MyToolbar(Context context) {        super(context);        resolveAttribute(context, null, R.attr.toolbarStyle);    }    public MyToolbar(Context context,@Nullable AttributeSet attrs) {        super(context,attrs);        resolveAttribute(context,attrs,R.attr.toolbarStyle);    }    public MyToolbar(Context context,@Nullable AttributeSet attrs, int defStyleAttr) {        super(context,attrs,defStyleAttr);        resolveAttribute(context,attrs,defStyleAttr);    }    private void resolveAttribute(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {// Need to use getContext() here so that we use the themed context        context = getContext();        final TintTypedArray a = TintTypedArray.obtainStyledAttributes(context,attrs,                R.styleable.Toolbar,defStyleAttr,0);        final int titleTextAppearance = a.getResourceId(R.styleable.Toolbar_titleTextAppearance,0);        if(titleTextAppearance !=0) {            setTitleTextAppearance(context,titleTextAppearance);        }        if(mTitleTextColor!=0) {            setTitleTextColor(mTitleTextColor);        }        a.recycle();        post(new Runnable() {            @Override            public void run() {                if(getLayoutParams()instanceof LayoutParams) {                    ((LayoutParams) getLayoutParams()).gravity= Gravity.CENTER;                }            }        });    }    @Override    public CharSequence getTitle() {        return mTitleText;    }    @Override    public void setTitle(CharSequence title) {        if(!TextUtils.isEmpty(title)) {            if(mTitleTextView==null) {                final Context context = getContext();                mTitleTextView=new TextView(context);                mTitleTextView.setSingleLine();                mTitleTextView.setEllipsize(TextUtils.TruncateAt.END);                if(mTitleTextAppearance!=0) {                    mTitleTextView.setTextAppearance(context,mTitleTextAppearance);                }                if(mTitleTextColor!=0) {                    mTitleTextView.setTextColor(mTitleTextColor);                }            }            if(mTitleTextView.getParent() !=this) {                addCenterView(mTitleTextView);            }        }else if(mTitleTextView!=null&&mTitleTextView.getParent() ==this) {// 当title为空时，remove            removeView(mTitleTextView);        }        if(mTitleTextView!=null) {            mTitleTextView.setText(title);        }        mTitleText= title;    }    private void addCenterView(View v) {        final ViewGroup.LayoutParams vlp = v.getLayoutParams();        final LayoutParams lp;        if(vlp ==null) {            lp = generateDefaultLayoutParams();        }else if(!checkLayoutParams(vlp)) {            lp = generateLayoutParams(vlp);        }else{            lp = (LayoutParams) vlp;        }        addView(v,lp);    }    @Override    public LayoutParams generateLayoutParams(AttributeSet attrs) {        LayoutParams lp =new LayoutParams(getContext(),attrs);        lp.gravity= Gravity.CENTER;        return lp;    }    @Override    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {        LayoutParams lp;        if(p instanceof LayoutParams) {            lp =new LayoutParams((LayoutParams) p);        }else if(p instanceof ActionBar.LayoutParams) {            lp =new LayoutParams((ActionBar.LayoutParams) p);        }else if(p instanceof MarginLayoutParams) {            lp =new LayoutParams((MarginLayoutParams) p);        }else{            lp =new LayoutParams(p);        }        lp.gravity= Gravity.CENTER;        return lp;    }    @Override    protected LayoutParams generateDefaultLayoutParams() {        LayoutParams lp =new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);        lp.gravity= Gravity.CENTER;        return lp;    }    @Override    public void setTitleTextAppearance(Context context, @RatingCompat.Style int resId) {        mTitleTextAppearance= resId;        if(mTitleTextView!=null) {            mTitleTextView.setTextAppearance(context,resId);        }    }    @Override    public void setTitleTextColor(@ColorInt int color) {        mTitleTextColor= color;        if(mTitleTextView!=null) {            mTitleTextView.setTextColor(color);        }    }    @Override    public void setNavigationIcon(@Nullable Drawable icon) {        super.setNavigationIcon(icon);        setGravityCenter();    }    public void setGravityCenter() {        post(new Runnable() {            @Override            public void run() {                setCenter("mNavButtonView");                setCenter("mMenuView");            }        });    }    private void setCenter(String fieldName) {        try{            Field field = getClass().getSuperclass().getDeclaredField(fieldName);//反射得到父类Field            field.setAccessible(true);            Object obj = field.get(this);//拿到对应的Object            if(obj ==null)return;            if(obj instanceof View) {                View view = (View) obj;                ViewGroup.LayoutParams lp = view.getLayoutParams();//拿到LayoutParams                if(lp instanceof ActionBar.LayoutParams) {                    ActionBar.LayoutParams params = (ActionBar.LayoutParams) lp;                    params.gravity= Gravity.CENTER;//设置居中                    view.setLayoutParams(lp);                }            }        }catch(NoSuchFieldException e) {            e.printStackTrace();        }catch(IllegalAccessException e) {            e.printStackTrace();        }    }}

由于其中的细节问题还未搞明白，大家可以一起探讨一下。原文地址：http://www.jianshu.com/p/621225a55561

喜欢就关注我的微信公众号吧，更多干货分享

1 0