自定义控件（二）

定义自定义控件时所用到的资源文件attrs此处不再示例怎么定义，若要查看请看《自定义控件（一）》

此自定义控件使用性也较高，可以被其他activity很容易的反复调用，下面来看一下实现代码：

调用时的xml代码：

<span style="font-size:14px;">xmlns:myapp="http://schemas.android.com/apk/res-auto"</span>

<span style="font-size:14px;"><costomview.MyOwnView        android:id="@+id/my_title_view"        android:layout_width="match_parent"        android:layout_height="wrap_content"        myapp:text_first="左一"        myapp:text_two="中间"        myapp:text_three="右一"        /></span>

<span style="font-size:14px;"></span>

<pre name="code" class="java"><span style="font-size:14px;"></span>

<span style="font-size:14px;">/** 自定义控件实现及监听* */public class MyOwnView extends RelativeLayout implements View.OnClickListener{    private LayoutInflater mInflater;    private OnClickListener mClickListener;    private String firstTxt,twoTxt,threeTxt;    public void setMyViewOnClickListener(OnClickListener l){   //activity中注册所调用的方法，接口采用系统定义接口（也可自定义一个接口）        mClickListener = l;    }    public MyOwnView(Context context) {        super(context);    }    public MyOwnView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context,attrs);    }    public MyOwnView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context,attrs);    }   public void init(Context context, AttributeSet attrs){       mInflater = LayoutInflater.from(context);       View v = mInflater.inflate(R.layout.own_view_layout,this,true);    //联系上下文解析原始布局       TypedArray a = null;       try {           a = context.getTheme().obtainStyledAttributes(attrs,R.styleable.MyOwnView,0,0);           //获取新布局中引用自定义控件设置的值           firstTxt = a.getString(R.styleable.MyOwnView_text_first);          twoTxt = a.getString(R.styleable.MyOwnView_text_two);          threeTxt = a.getString(R.styleable.MyOwnView_text_three);       }finally {           a.recycle();   //回收       }       if (firstTxt != null){           TextView first = (TextView) v.findViewById(R.id.own_first_txt);   //设置值在原始布局中           first.setText(firstTxt);           first.setOnClickListener(this);     //此处采用系统接口注册       }       if (twoTxt != null){           TextView two = (TextView) v.findViewById(R.id.own_two_txt);           two.setText(twoTxt);       }       if (threeTxt != null){           TextView three = (TextView) v.findViewById(R.id.own_three_txt);           three.setText(threeTxt);           three.setOnClickListener(this);       }   }    @Override    public void onClick(View v) {        if (mClickListener != null){            mClickListener.onClick(v);        }    }}</span>

<span style="font-size:14px;">activity中实现：</span>

<pre name="code" class="html"><span style="font-size:14px;">public class MyViewTestActivity extends Activity {    private MyOwnView myOwnView ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.myview_layout);        myOwnView = (MyOwnView) findViewById(R.id.my_title_view);        myOwnView.setMyViewOnClickListener(new View.OnClickListener() {   //实现监听            @Override            public void onClick(View v) {                switch (v.getId()){                    case R.id.own_first_txt:                        finish();                        break;                    case R.id.own_three_txt:                        Toast.makeText(MyViewTestActivity.this,"点击成功",Toast.LENGTH_SHORT).show();                        break;                }            }        });    }}</span>

设置所用到的原始布局，

<span style="font-size:14px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="40dp"    android:background="@android:color/holo_blue_light">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/own_first_txt"        android:textSize="14sp"        android:layout_marginLeft="10dp"        android:padding="5dp"        android:layout_centerVertical="true"        android:background="@drawable/own_view_press_selector"        android:textColor="@android:color/white"        android:text="返回"/>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/own_two_txt"        android:text="标题"        android:layout_centerInParent="true"        android:textColor="@android:color/white"        android:textSize="20sp"/>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/own_three_txt"        android:textSize="14sp"        android:layout_marginRight="10dp"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:textColor="@android:color/white"        android:padding="5dp"        android:background="@drawable/own_view_press_selector"        android:text="设置"/></RelativeLayout></span>

效果图如下：