自定义view的toolbar

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本篇讲解如何简单的封装toolbar，用到了builder设计模式，使用起来也非常方便。

看看是怎么封装的吧！

首先创建一个toolbar布局文件：然后定义一个接口，用于对toolbar中组件的操作：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/match_wrap"
    android:orientation="vertical">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/ivLeftImg"
            style="@style/wrap_macth"
            android:layout_gravity="left"
            android:padding="@dimen/system_padding" />

        <TextView
            android:id="@+id/tvTitle"
            style="@style/wrap_macth"
            android:layout_gravity="center"
            android:gravity="center" />

        <ImageView
            android:id="@+id/ivRightImg"
            style="@style/wrap_macth"
            android:layout_gravity="right"
            android:padding="@dimen/system_padding" />

    </FrameLayout>

</LinearLayout>

然后定义一个接口，用于对toolbar中组件的操作：

public interface AssemblyBuilder {

    public Toolbar build();

    public AssemblyBuilder showLeftImage(int resId);

    public AssemblyBuilder hideLeftImage();

    public AssemblyBuilder showRightImage(int resId);

    public AssemblyBuilder hideRightImage();

    public AssemblyBuilder showTitle(int resId);

    public AssemblyBuilder hideTitle();

    public AssemblyBuilder onClickLeftImage(OnClickListener onClickListener);

    public AssemblyBuilder onClickRightImage(OnClickListener onClickListener);
}

接下来就是我们自定义的toolbar了，创建一个类CustomToolbar， 继承toolbar，在这个类中初始化组件：

public ImageView getmLeftImg() {
    return (ImageView) findViewById(R.id.ivLeftImg);
}

public ImageView getmRightImg() {
    return (ImageView) findViewById(R.id.ivRightImg);
}

public TextView getmTitle() {
    return (TextView) findViewById(R.id.tvTitle);
}

然后就是我们的builder类了，在CustomToolbar类中定义一个内部类Builder，实现AssemblyBuilder接口：

public static class Builder implements AssemblyBuilder {

    private WEToolbar toolbarAssembly;
    private ImageView leftView;
    private TextView appTitle;
    private ImageView rightView;

    public Builder(WEToolbar weToolbar) {
        toolbarAssembly = weToolbar;
        leftView = toolbarAssembly.getmLeftImg();
        appTitle = toolbarAssembly.getmTitle();
        rightView = toolbarAssembly.getmRightImg();
    }

    @Override
    public WEToolbar build() {
        return toolbarAssembly;
    }

    @Override
    public AssemblyBuilder showLeftImage(int leftImage) {
        if (leftView != null) {
            leftView.setImageResource(leftImage);
            leftView.setVisibility(VISIBLE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder hideLeftImage() {
        if (leftView != null) {
            leftView.setVisibility(GONE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder showRightImage(int rightImage) {
        if (rightView != null) {
            rightView.setImageResource(rightImage);
            rightView.setVisibility(VISIBLE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder hideRightImage() {
        if (rightView != null) {
            rightView.setVisibility(GONE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder showTitle(int title) {
        if (appTitle != null) {
            appTitle.setText(title);
            appTitle.setVisibility(VISIBLE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder hideTitle() {
        if (appTitle != null) {
            appTitle.setVisibility(GONE);
        }
        return this;
    }

    @Override
    public AssemblyBuilder onClickLeftImage(OnClickListener onClickListener) {
        if (leftView != null) {
            leftView.setOnClickListener(onClickListener);
        }
        return this;
    }

    @Override
    public AssemblyBuilder onClickRightImage(OnClickListener onClickListener) {
        if (rightView != null) {
            rightView.setOnClickListener(onClickListener);
        }

        return this;
    }

}

这个内部类就是简单的builder设计模式，
然后就可以在activity中使用啦 ！
在布局文件中：初始化我们的toolbar后，直接调用：

new WEToolbar.Builder(toolbar)

.showRightImage(R.mipmap.ic_launcher)
.showTitle(R.string.toolbar)
.onClickRightImage(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Toast.makeText(getApplicationContext(), "right", Toast.LENGTH_SHORT).show();
    }
})
.hideLeftImage();


当然，如果每个activity都用到toolbar的话，还可以将toolbar集成到BaseActivity里，

是不是很方便！

源码下载