实现了《android 群英传》的TopBar的小实例。效果图如下：
记录下来，方便下次查看。主要的原理是将2个Button和一个TextView组合在一个RelativeLayout之中。
代码如下。首先定义自定义属性attrs.xml,也可能是先实现一个控件，然后再抽象出一些属性。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TopBar">
<attr name="title" format="string" />
<attr name="titleTextSize" format="dimension" />
<attr name="titleTextColor" format="color" />
<attr name="leftTextColor" format="color" />
<attr name="leftBackground" format="reference|color" />
<attr name="leftText" format="string" />
<attr name="rightTextColor" format="color" />
<attr name="rightBackground" format="reference|color" />
<attr name="rightText" format="string" />
</declare-styleable>
</resources>
然后是自定一个一个TopBar，在之中组合Button和TextView，动态地设置属性值和布局。下面是自定义的按钮点击事件的接口。
package com.example.androidviewlearn;
public interface TopBarClickListener {
void leftClick();
void rightClick();
}
package com.example.androidviewlearn;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Trace;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class TopBar extends RelativeLayout {
// 获取自定义的类型数组s
private TypedArray ta;
private int mLeftTextColor;
private Drawable mLeftBackground;
private String mLeftText;
private int mRightTextColor;
private Drawable mRightBackground;
private String mRightText;
private int mTitleTextSize;
private int mTitleTextColor;
private String mTtile;
private Button mLeftButton;
private Button mRightButton;
private TextView mTitleView;
private LayoutParams mLeftLayoutParams;
private LayoutParams mRightLayoutParams;
private LayoutParams mTitleLayoutParams;
private TopBarClickListener mBarClickListener;
//三个构造函数，一般采用这些写法。
public TopBar(Context context) {
this(context, null);
// TODO Auto-generated constructor stub
}
public TopBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// TODO Auto-generated constructor stub
}
@SuppressLint("NewApi")
public TopBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// TODO Auto-generated constructor stub
//获取布局中设置的自定义属性
getStyleValue(context, attrs);
//初始化控件，并且把属性值设置进去
initView(context);
//设置各个控件的布局
setLayout();
}
/**
* 设置自定义空间的布局属性
*/
private void setLayout() {
mLeftLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
mLeftLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);
addView(mLeftButton, mLeftLayoutParams);
mRightLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
mRightLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);
addView(mRightButton, mRightLayoutParams);
mTitleLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
mTitleLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);
addView(mTitleView, mTitleLayoutParams);
}
@SuppressLint("NewApi")
/**
* 初始化控件，并且给空间赋予属性和事件
* @param context
*/
private void initView(Context context) {
mLeftButton = new Button(context);
mRightButton = new Button(context);
mTitleView = new TextView(context);
mLeftButton.setTextColor(mLeftTextColor);
mLeftButton.setText(mLeftText);
mLeftButton.setBackground(mLeftBackground);
mLeftButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View paramView) {
// TODO Auto-generated method stub
mBarClickListener.leftClick();
}
});
mRightButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View paramView) {
// TODO Auto-generated method stub
mBarClickListener.rightClick();
}
});
mRightButton.setTextColor(mRightTextColor);
mRightButton.setText(mRightText);
mRightButton.setBackground(mRightBackground);
mTitleView.setText(mTtile);
mTitleView.setTextColor(mTitleTextColor);
mTitleView.setTextSize(mTitleTextSize);
mTitleView.setGravity(Gravity.CENTER);
}
/**
* 获取自定义空间上的style
* @param context
* @param attrs
*/
private void getStyleValue(Context context, AttributeSet attrs) {
ta = context.obtainStyledAttributes(attrs, R.styleable.TopBar);
mLeftTextColor = ta.getColor(R.styleable.TopBar_leftTextColor, 0);
mLeftBackground = ta.getDrawable(R.styleable.TopBar_leftBackground);
mLeftText = ta.getString(R.styleable.TopBar_leftText);
mRightTextColor = ta.getColor(R.styleable.TopBar_rightTextColor, 0);
mRightBackground = ta.getDrawable(R.styleable.TopBar_rightBackground);
mRightText = ta.getString(R.styleable.TopBar_rightText);
mTitleTextSize = ta.getDimensionPixelSize(R.styleable.TopBar_titleTextSize, 10);
mTitleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor, 0);
mTtile = ta.getString(R.styleable.TopBar_title);
ta.recycle();
}
public TopBarClickListener getmBarClickListener() {
return mBarClickListener;
}
public void setBarClickListener(TopBarClickListener mBarClickListener) {
this.mBarClickListener = mBarClickListener;
}
/**
* id=1标识→_→，id-0标识左边
*
* @param id
* @param flag
*/
public void setButtonVisable(int id, boolean flag) {
if (flag) {
if (id == 0) {
mLeftButton.setVisibility(View.VISIBLE);
} else {
mRightButton.setVisibility(View.VISIBLE);
}
} else {
if (id == 0) {
mLeftButton.setVisibility(View.GONE);
} else {
mRightButton.setVisibility(View.GONE);
}
}
}
}
之后定义一个layout，activity_main.xml，把放入自定义布局和设置参数。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.androidviewlearn.MainActivity" >
<com.example.androidviewlearn.TopBar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:id="@+id/topBar"
android:layout_width="match_parent"
android:layout_height="40dp"
custom:leftBackground="#98F5FF"
custom:leftText="Back"
custom:leftTextColor="#FFFAFA"
custom:rightBackground="#98F5FF"
custom:rightText="More"
custom:rightTextColor="#FFFAFA"
custom:title="Fuck Day"
custom:titleTextColor="#123412"
custom:titleTextSize="16sp"
>
</com.example.androidviewlearn.TopBar>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</LinearLayout>
特别注意这一行，xmlns:custom="http://schemas.android.com/apk/res-auto"。custom就表示了设置属性时候的前缀：custom:rightBackground
最后的就是Activity的实现了。
package com.example.androidviewlearn;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends Activity {
private TopBar mTopBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTopBar = (TopBar) findViewById(R.id.topBar);
mTopBar.setBarClickListener(new TopBarClickListener() {
@Override
public void rightClick() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "right fuck button", Toast.LENGTH_LONG).show();
}
@Override
public void leftClick() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "left fuck button", Toast.LENGTH_LONG).show();
}
});
}
}
时间： 2024-08-07 04:14:37