1、创建自定义的属性：
2、在自定义的布局中获取属性；
3、在mainActivity中使用 自定义控件，并使用自定义属性赋值。
1、创建自定义的属性创建
values/attr.xml 文件；
<?xml version="1.0" encoding="utf-8"?><resources><declare-styleable name="Topbar"><attr name="title" format="string"/><attr name="title_color" format="color"/><attr name="title_size" format="dimension"/><attr name="btn_height" format="dimension"/><attr name="btn_margin" format="dimension"/><attr name="btn_vertical_margin" format="dimension"/><attr name="btn_horizontal_margin" format="dimension"/><attr name="right_text" format="string"/><attr name="left_text" format="string"/><attr name="right_background" format="reference|color"/><attr name="left_background" format="reference|color"/></declare-styleable></resources>
2、在自定义的布局中获取属性；
package com.sjzs.customui.ui;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.Gravity;import android.widget.Button;import android.widget.RelativeLayout;import android.widget.TextView;import com.sjzs.customui.R;/*** Created by yy520 on -3-24.*/public class TitleBar extends RelativeLayout{private Button leftButton,rightButton;private TextView titleText;private LayoutParams leftParams,rightParams,titleParams;private String title;private int titleColor;private float titleSize;private int btnMargin,btn_v_margin,btn_h_margin;private int btn_height;private String rightText;private String leftText;private Drawable rightBackground;private Drawable leftBackground;public void setRightOnClickListener(OnClickListener onClickListener){rightButton.setOnClickListener(onClickListener);}public void setLeftOnClickListener(OnClickListener onClickListener){leftButton.setOnClickListener(onClickListener);}public TitleBar(Context context, AttributeSet attrs) {super(context, attrs);TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.Topbar);title = ta.getString(R.styleable.Topbar_title);titleColor = ta.getColor(R.styleable.Topbar_title_color,0);titleSize = ta.getDimension(R.styleable.Topbar_title_size,0);btnMargin = (int) ta.getDimension(R.styleable.Topbar_btn_margin,0);btn_v_margin = (int) ta.getDimension(R.styleable.Topbar_btn_vertical_margin,0);btn_h_margin = (int) ta.getDimension(R.styleable.Topbar_btn_horizontal_margin,0);btn_height = (int) ta.getDimension(R.styleable.Topbar_btn_height,0);rightText = ta.getString(R.styleable.Topbar_right_text);leftText = ta.getString(R.styleable.Topbar_left_text);rightBackground = ta.getDrawable(R.styleable.Topbar_right_background);leftBackground = ta.getDrawable(R.styleable.Topbar_left_background);btn_v_margin = (int) ta.getDimension(R.styleable.Topbar_btn_vertical_margin,0);btn_h_margin = (int) ta.getDimension(R.styleable.Topbar_btn_horizontal_margin,0);ta.recycle();//回收资源，防止内存泄漏leftButton = new Button(context);rightButton = new Button(context);titleText = new TextView(context);leftButton.setText(leftText);leftButton.setTextColor(titleColor);leftButton.setBackground(leftBackground);leftButton.setPadding(10,0,10,0);rightButton.setText(rightText);rightButton.setTextColor(titleColor);rightButton.setBackground(rightBackground);rightButton.setPadding(10,0,10,0);titleText.setText(title);titleText.setTextColor(titleColor);titleText.setTextSize(titleSize);titleText.setGravity(Gravity.CENTER);if(btn_v_margin == 0){btn_v_margin = btnMargin;}if(btn_h_margin == 0){btn_h_margin = btnMargin;}leftParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT,TRUE);leftParams.setMargins(btn_h_margin,btn_v_margin,0,btn_v_margin);//设置button高度，Android 默认高度太高。if(btn_height!=0)leftParams.height = btn_height;addView(leftButton,leftParams);rightParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,TRUE);rightParams.setMargins(0,btn_v_margin,btn_h_margin,btn_v_margin);if(btn_height!=0)rightParams.height = btn_height;addView(rightButton,rightParams);titleParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);titleParams.addRule(RelativeLayout.CENTER_IN_PARENT,TRUE);addView(titleText,titleParams);}}
3、在mainActivity布局中使用 自定义控件，并使用自定义属性赋值。
Activity:
public class MainActivity extends AppCompatActivity {private Context context = this;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}private void init() {TitleBar view = (TitleBar) findViewById(R.id.title_bar);view.setRightOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(context,"Right",Toast.LENGTH_LONG).show();}});view.setLeftOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(context,"Left",Toast.LENGTH_LONG).show();}});}}
Layout
<?xml version="1.0" encoding="utf-8"?><!-- xmlns:app="/apk/res-auto" 自定义属性名称空间，没有它自定义属性会报错--><android.support.constraint.ConstraintLayout xmlns:android="/apk/res/android"xmlns:app="/apk/res-auto"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.sjzs.customui.MainActivity"><com.sjzs.customui.ui.TitleBarandroid:id="@+id/title_bar"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@color/colorGreen"app:title = "标题"app:title_color = "#FFFFFF"app:title_size = "7dp"app:right_text = "返回"app:left_text = "菜单"app:btn_height = "30dp"app:btn_horizontal_margin = "15dp"app:btn_vertical_margin = "10dp"app:left_background = "@drawable/button_bg_frame"app:right_background = "@drawable/button_bg_frame"></com.sjzs.customui.ui.TitleBar></android.support.constraint.ConstraintLayout>
其他属性：
color;
<?xml version="1.0" encoding="utf-8"?><resources><color name="colorGreen">#9CCB39</color><color name="white">#FFFFFF</color></resources>
按钮背景：
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="/apk/res/android"><stroke android:width="1dp"android:color="@color/white"/><solid android:color="@color/colorGreen"></solid><corners android:radius="3dp" /></shape>
