帮我解决问题。有一个主要的布局RelativeLayout它是Linearlayout，我想以编程方式添加视图。这是我的代码。
public class GenBarCodeActivity extends Activity {
BarCodeView Barview = null;
LinearLayout.LayoutParams layoutParams;
LinearLayout ll;
RelativeLayout rl;
Button getBarCode;
private static final int ID = 34646456;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_barcode);
getBarCode = (Button)findViewById(R.id.btnGetBarCode);
getBarCode.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ll = (LinearLayout)findViewById(R.id.linearCodeView);
EANTEXT = edBarText.getText().toString();
ImageView old = (ImageView) ll.findViewById(ID);
if (old != null) {
((LinearLayout) old.getParent()).removeViewInLayout(old);
}
layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
ll.addView(Barview, layoutParams);
rl.invalidate();
}
});
fillLinear();
setBarCode();
}
private void fillLinear(){
rl = (RelativeLayout)findViewById(R.id.layout_barcode);
ll = (LinearLayout)findViewById(R.id.linearCodeView);
layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
ImageView imBar = new ImageView(this);
Bitmap imbitmap = BitmapFactory.decodeResource(getResources(), R.drawable.barcode);
imBar.setLayoutParams(layoutParams);
imBar.setImageBitmap(imbitmap);
imBar.setId(ID);
ll.setBackgroundColor(Color.TRANSPARENT);
ll.addView(imBar);
}
private void setBarCode(){
Barview = new BarCodeView(GenBarCodeActivity.this);
Barview.setBarCodeNum(0);
}
}
这是我的观点
public class BarCodeView extends View {
private static int numcode = 0;
private static String codedata = null;
public BarCodeView(Context context) {
super(context);
}
public void setBarCodeText(String text){
this.codedata = text;
}
public String getBarCodeText(){
return this.codedata;
}
public void setBarCodeNum(int num){
this.numcode = num;
}
public int getBarCodeNum(){
return this.numcode;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
switch (numcode) {
// ean 13
case 0:
try{
showEAN13(canvas);
} catch (Exception e) {
e.printStackTrace();
}
break;
}
}
private static void showEAN13(Canvas canvas) throws Exception {
EAN13 barcode = new EAN13();
/*
EAN 13 Valid data char set:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9 (Digits)
EAN 13 Valid data length: 12 digits only, excluding the last checksum digit
*/
barcode.setData(codedata);
// for EAN13 with supplement data (2 or 5 digits)
/*
barcode.setSupData("12");
// supplement bar height vs bar height ratio
barcode.setSupHeight(0.8f);
// space between barcode and supplement barcode (in pixel)
barcode.setSupSpace(15);
*/
// Unit of Measure, pixel, cm, or inch
barcode.setUom(IBarcode.UOM_PIXEL);
// barcode bar module width (X) in pixel
barcode.setX(2f);
// barcode bar module height (Y) in pixel
barcode.setY(90f);
// barcode image margins
barcode.setLeftMargin(10f);
barcode.setRightMargin(10f);
barcode.setTopMargin(10f);
barcode.setBottomMargin(10f);
// barcode image resolution in dpi
barcode.setResolution(72);
// disply barcode encoding data below the barcode
barcode.setShowText(true);
// barcode encoding data font style
barcode.setTextFont(new AndroidFont("Arial", Typeface.NORMAL, 10));
// space between barcode and barcode encoding data
barcode.setTextMargin(6);
barcode.setTextColor(AndroidColor.black);
// barcode bar color and background color in Android device
barcode.setForeColor(AndroidColor.black);
barcode.setBackColor(AndroidColor.white);
/*
specify your barcode drawing area
*/
RectF bounds = new RectF(120, 120, 0, 0);
barcode.drawBarcode(canvas, bounds);
}
}
这是我的xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_barcode"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0e0a2"
android:orientation="vertical" >
<ImageView
android:id="@+id/closeBarCode"
android:layout_width="30dip"
android:layout_height="30dip"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/txtInfo"
android:layout_marginRight="3dp"
android:src="@drawable/delete" />
<TextView
android:id="@+id/txtInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginLeft="3dp"
android:layout_marginTop="3dp"
android:text="@string/barcode_title"
android:textColor="#000"
android:textSize="20dip" />
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/closeBarCode" >
<TextView
android:id="@+id/txtEAN"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/barcode_ean"
android:textColor="#000"
android:textSize="20dip" />
<Spinner
android:id="@+id/spEAN"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtInfo"
android:layout_below="@+id/linearLayout1" >
<TextView
android:id="@+id/txtCodeColor"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/barcode_color"
android:textColor="#000"
android:textSize="20dip" />
<Spinner
android:id="@+id/spCodeColor"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/linearLayout2"
android:layout_below="@+id/linearLayout2" >
<TextView
android:id="@+id/txtCodeBackColor"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/barcode_back_color"
android:textColor="#000"
android:textSize="20dip" />
<Spinner
android:id="@+id/spCodeBackColor"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/linearLayout3" >
<TextView
android:id="@+id/txtCodePosition"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/barcode_position"
android:textColor="#000"
android:textSize="20dip" />
<Spinner
android:id="@+id/spCodePosition"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:id="@+id/linearCodeView"
android:layout_width="300dip"
android:layout_height="200dip"
android:layout_below="@+id/edBarCode"
android:layout_marginRight="45dp"
android:layout_marginTop="25dip"
android:layout_toLeftOf="@+id/closeBarCode"
android:orientation="vertical" >
</LinearLayout>
<Button
android:id="@+id/btnSetBarCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnGetBarCode"
android:layout_alignBottom="@+id/btnGetBarCode"
android:layout_toLeftOf="@+id/closeBarCode"
android:text="@string/set_code" />
<Button
android:id="@+id/btnGetBarCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="31dp"
android:text="@string/get_code" />
<EditText
android:id="@+id/edBarCode"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/linearCodeView"
android:layout_alignRight="@+id/linearCodeView"
android:layout_below="@+id/txtCodeText"
android:layout_marginTop="23dp"
android:ems="10" />
<TextView
android:id="@+id/txtCodeText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/edBarCode"
android:layout_below="@+id/txtInfo"
android:layout_marginRight="86dp"
android:text="@string/code_text"
android:textColor="#000"
android:textSize="20dip" />
</RelativeLayout>
我需要Linearlayout“@ + id / linearCodeView”插入我的BarCodeView。 添加LinearLayout后，视图不可见。
答案 0 :(得分：0)
RelativeLayout.LayoutParams paramsBottom = new RelativeLayout.LayoutParams(android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
rl.addView(ll, paramsBottom); //add linearlayout in relativelayout
修改： -
LinearLayout.LayoutParams paramsBottom2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
ll.addView(Barview, paramsBottom2);//add Barview in linearlayout
或
RelativeLayout.LayoutParams paramsBottom2 = new RelativeLayout.LayoutParams(android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
rl.addView(Barview, paramsBottom2);//add Barview in relativelayout