Android自定义View

Android中自定义View可以分两种，一种为使用系统提供View来拼成一个想要的View（比如在程序中多次出现同样的view，可以共用，相当于封装吧），另一种为自己直接使用Paint画。

本文是属于第一种，大概可分4个步骤，如果不需要自定义标签属性第一步则可跳过。

代码如下：




1. 写一个attrs:（如果不需要自定义属性则不需要）

 
    <declare-styleable name="MyLayoutView">
        <attr format="reference" name="tile" />
        <attr format="reference" name="tittle" />
        <attr format="reference" name="content" />
    </declare-styleable>

2. layout布局（my_layout.xml）：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_vertical">
  
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical" >
  
            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_toLeftOf="@+id/my_tile"
                android:layout_marginLeft="15dip"
                android:orientation="vertical" >
  
                 <TextView
                     android:id="@+id/my_tittle"
                    style="@style/T7_2_Subhead"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="15dip"
                    android:includeFontPadding="false"
                    android:text="" />
  
                 <TextView
                    android:id="@+id/my_description"
                    style="@style/T7_5_Bodycopy"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:includeFontPadding="false" />
            </LinearLayout>
  
            <TextView
                android:id="@+id/my_tile"
                android:layout_width="200dip"
                android:layout_height="200dip"
                android:layout_alignParentRight="true"
                android:scaleType="fitXY" />
        </RelativeLayout>
    </LinearLayout>

3. 编写MyLayoutView:

packge com.a.b;
public class MyLayoutView extends LinearLayout {
    private int tile;
    private int tittle;
    private int content;
    private ImageView tileView;
    private TextView tittleView;
    private TextView contentView;
    private View view;
  
    public MyLayoutView(Context context) {
        super(context);
    }
  
    public MyLayoutView(Context context, AttributeSet attrs) {
        super(context, attrs);
  
        TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.MyLayoutView);
        tile =  array.getResourceId(R.styleable.MyLayoutView_tile, -1);
        tittle = array.getResourceId(R.styleable.MyLayoutView_tittle, -1);
        content = array.getResourceId(R.styleable.MyLayoutView_content, -1);
  
        LayoutInflater inflater = LayoutInflater.from(context);
        this.view = inflater.inflate(R.layout.my_layout, null);
  
        tileView = (ImageView) view.findViewById(R.id.my_tile);
        tittleView = (TextView) view.findViewById(R.id.my_tittle);
        contentView = (TextView) view.findViewById(R.id.my_description);
    }
      
    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        this.initialize();
    }
  
    private void initialize() {
  
        tileView.setImageResource(tile);
        tittleView.setText(tittle);
        contentView.setText(content);
  
        LinearLayout.LayoutParams activityParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        this.removeView(this.view);
        this.addView(this.view, activityParams);
    }
}
  

4. 使用:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:my="http://schemas.android.com/apk/res/com.a.b"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
  
         <com.a.b.MyLayoutView
           android:layout_width="fill_parent"
           android:layout_height="fill_parent"
           my:content="@string/my_summary1"
           my:tile="@drawablemy_one_image"
           my:tittle="@string/my_tittle1" />
  
</RelativeLayout>