Android自定义控件（一）

public class MyView extends View {

private String mtext;

private int msrc;

public MyView(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public MyView(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

int resourceId = 0;

int textId = attrs.getAttributeResourceValue(null, "Text",0);

int srcId = attrs.getAttributeResourceValue(null, "Src", 0);

mtext = context.getResources().getText(textId).toString();

msrc = srcId;

}

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

Paint paint = new Paint();

paint.setColor(Color.RED);

InputStream is = getResources().openRawResource(msrc); 

        Bitmap mBitmap = BitmapFactory.decodeStream(is);

        int bh = mBitmap.getHeight();

        int bw = mBitmap.getWidth();

canvas.drawBitmap(mBitmap, 0,0, paint);

//canvas.drawCircle(40, 90, 15, paint);

canvas.drawText(mtext, bw/2, 30, paint);

}

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <com.example.myimageview2.MyView

        android:id="@+id/myView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" 

        Text="@string/hello_world"

        Src="@drawable/xh"/>

</LinearLayout>

public class MyImageView extends LinearLayout {

public MyImageView(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public MyImageView(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

int resourceId = -1;

TypedArray typedArray = context.obtainStyledAttributes(attrs,

R.styleable.MyImageView);

ImageView iv = new ImageView(context);

TextView tv = new TextView(context);

int N = typedArray.getIndexCount();

for (int i = 0; i < N; i++) {

int attr = typedArray.getIndex(i);

switch (attr) {

case R.styleable.MyImageView_Oriental:

resourceId = typedArray.getInt(

R.styleable.MyImageView_Oriental, 0);

this.setOrientation(resourceId == 1 ? LinearLayout.HORIZONTAL

: LinearLayout.VERTICAL);

break;

case R.styleable.MyImageView_Text:

resourceId = typedArray.getResourceId(

R.styleable.MyImageView_Text, 0);

tv.setText(resourceId > 0 ? typedArray.getResources().getText(

resourceId) : typedArray

.getString(R.styleable.MyImageView_Text));

break;

case R.styleable.MyImageView_Src:

resourceId = typedArray.getResourceId(

R.styleable.MyImageView_Src, 0);

iv.setImageResource(resourceId > 0 ?resourceId:R.drawable.ic_launcher);

break;

}

}

addView(iv);

addView(tv);

typedArray.recycle();

}

}

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="MyImageView">

        <attr name="Text" format="reference|string"></attr>

        <attr name="Oriental" >

            <enum name="Horizontal" value="1"></enum>

            <enum name="Vertical" value="0"></enum>

        </attr>

        <attr name="Src" format="reference|integer"></attr>

    </declare-styleable>

</resources>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:uview="http://schemas.android.com/apk/res/com.example.myimageview2"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <com.example.myimageview2.MyImageView

        android:id="@+id/myImageView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        uview:Text="这是一个图片说明" 

        uview:Src="@drawable/tw"

        uview:Oriental="Vertical">

    </com.example.myimageview2.MyImageView>

</LinearLayout>