一个简单的自定义TopBar

在看《Android群英传》看到自定义view复合控件，就照着书敲了下。

attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyTopBar">        <attr name="mtitle" format="string"/>        <attr name="mtitleTextSize" format="dimension"/>        <attr name="mtitleTextColor" 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>

MyTopBar.java

public class MyTopBar extends RelativeLayout {    private TypedArray typedArray;    private int titleTextColor;    private int leftTextColor;    private int rightTextColor;    private Drawable leftBackground;    private Drawable rightBackground;    private String rightText;    private String leftText;    private String title;    private float titleTextSize;    private Button mLeftButton;    private Button mRightButton;    private TextView mTitleView;    private LayoutParams mLeftParams;    private LayoutParams mRightParams;    private LayoutParams mTitlepParams;    topbarClickListener listener;    public MyTopBar(Context context, AttributeSet attrs) {        super(context, attrs);        //获取属性        typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyTopBar);        titleTextColor = typedArray.getColor(R.styleable.MyTopBar_mtitleTextColor, 0);        leftTextColor = typedArray.getColor(R.styleable.MyTopBar_leftTextColor, 0);        rightTextColor = typedArray.getColor(R.styleable.MyTopBar_rightTextColor, 0);        leftBackground = typedArray.getDrawable(R.styleable.MyTopBar_leftBackground);        rightBackground = typedArray.getDrawable(R.styleable.MyTopBar_rightBackground);        leftText = typedArray.getString(R.styleable.MyTopBar_leftText);        rightText = typedArray.getString(R.styleable.MyTopBar_rightText);        title = typedArray.getString(R.styleable.MyTopBar_mtitle);        titleTextSize = typedArray.getDimension(R.styleable.MyTopBar_mtitleTextSize, 10);        typedArray.recycle();        mLeftButton = new Button(context);        mRightButton = new Button(context);        mTitleView = new TextView(context);        mLeftButton.setText(leftText);        mLeftButton.setTextColor(leftTextColor);        mLeftButton.setBackground(leftBackground);        mRightButton.setText(rightText);        mRightButton.setTextColor(rightTextColor);        mRightButton.setBackground(rightBackground);        mTitleView.setText(title);        mTitleView.setTextColor(titleTextColor);        mTitleView.setTextSize(titleTextSize);        mTitleView.setGravity(Gravity.CENTER);        mLeftParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);        mLeftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);        addView(mLeftButton, mLeftParams);        mRightParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);        mRightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);        addView(mRightButton, mRightParams);        mTitlepParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);        mTitlepParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);        addView(mTitleView, mTitlepParams);        mLeftButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                listener.leftClick();            }        });        mRightButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                listener.rightClick();            }        });    }    public void setOnTopBarClickListener(topbarClickListener listener) {        this.listener = listener;    }    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);            }        }    }    public interface topbarClickListener {        void leftClick();        void rightClick();    }}

使用activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:custom="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <com.example.lklknbnhh.mytopbar.MyTopBar        android:background="@color/colorPrimaryDark"        android:id="@+id/topbar"        android:layout_width="match_parent"        android:layout_height="50dp"        custom:leftText="返回"        custom:leftTextColor="#ffffff"        custom:rightText="更多"        custom:rightTextColor="#ffffff"        custom:rightBackground="@mipmap/ic_launcher"        custom:mtitle="我是标题"        custom:mtitleTextColor="#ffffff"        custom:mtitleTextSize="10sp"        /></RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {    private MyTopBar topBar;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        topBar = (MyTopBar)findViewById(R.id.topbar);        topBar.setOnTopBarClickListener(new MyTopBar.topbarClickListener() {            @Override            public void leftClick() {                Toast.makeText(getApplicationContext(),"左侧按钮被点击",Toast.LENGTH_SHORT).show();                topBar.setButtonVisable(0, false);                topBar.setButtonVisable(1,true);            }            @Override            public void rightClick() {                Toast.makeText(getApplicationContext(),"右侧按钮被点击",Toast.LENGTH_SHORT).show();                topBar.setButtonVisable(1,false);                topBar.setButtonVisable(0,true);            }        });    }}