Adding image programmatically to RelativeLayout

android, android-relativelayout

Solution

you are using `(ImageView)findViewById(R.drawable.animalplanet)` and its not a proper way to programatically do it afaik. If you want to inflate an `ImageView` you should do something like this:

RelativeLayout.LayoutParams imParams = 
new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
ImageView imSex = new ImageView(context);
imSex.setImageResource(getmyImage());
imSex.setId(2);
addView(imSex,imParams);

However, if you will only display the image without beeing clickable and loading it from a database I suggest you use a ViewBinder

Problem

I want to add to a linearlayout, various relative layouts via code. Each relative layouts consists of: an imageview at the left, a textview beside it to the right (exactly in the middle) and another Image at the right. I must add them using data read from a database. It must be with relativelayout because I want to use a listener over the image and a different listener over the RL. Each relativelayout looks like this thing I have in XML. ``` <RelativeLayout android:id="@+id/relativecanal" android:layout_width="match_parent" android:layout_height="wrap_content" > <ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:src="@drawable/antena3" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="39dp" android:layout_toRightOf="@+id/imageView1" android:text="Large Text" android:textAppearance="?android:attr/textAppearanceLarge" /> <ImageView android:id="@+id/imageView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:src="@drawable/star" /> </RelativeLayout> ``` I am using this code: but I get a NullPointerException at the moments of making the addView() for the image, I tried just with adding the textView and it works. ``` try { File sdcard = Environment.getExternalStorageDirectory(); File file = new File(sdcard,archivoCanales); LinearLayout layout = (LinearLayout) findViewById(R.id.channelslistlayout); BufferedReader br = new BufferedReader(new FileReader(file)); String line; while ((line = br.readLine()) != null) { RelativeLayout channel=new RelativeLayout(this); channel.setBackgroundColor(2); TextView channelName=new TextView(this); channelName.setText(new String(line)); ImageView image=(ImageView)findViewById(R.drawable.animalplanet); LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT ); RelativeLayout.LayoutParams firstImageParams = new RelativeLayout.LayoutParams( android.view.ViewGroup.LayoutParams.WRAP_CONTENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT); firstImageParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); RelativeLayout.LayoutParams secImageParams = new RelativeLayout.LayoutParams( android.view.ViewGroup.LayoutParams.WRAP_CONTENT,android.view.ViewGroup.LayoutParams.WRAP_CONTENT); secImageParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); channel.addView(image,firstImageParams); channel.addView(channelName,secImageParams); layout.addView(channel,llp); } } catch (IOException e) { e.printStackTrace(); } ```

Original source