Getting inflate exception in Android
I am very new to Android development and I am facing a little problem here. I want to create a custom TextView class by extending TextView and use this class in ListView(every row of ListView contains this class' object).
I have created my custom class like this
public class CustomTextView extends TextView{
Context context;
Paint mPaint;
String text;
public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public CustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomTextView(Context context) {
super(context);
init();
}
private void init(){
setPadding(3, 3, 3, 3);
mPaint.setTextSize(16);
mPaint.setColor(Color.GREEN);
mPaint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
}
@Override
public void setText(CharSequence text, BufferType type) {
this.text = (String) text;
super.setText(text, type);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Rect rect = new Rect();
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.WHITE);
paint.setStrokeWidth(3);
getLocalVisibleRect(rect);
canvas.drawRect(rect, paint);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int reqWidth;
int reqHeight;
// width & height mode
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
// specified width & height
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
// find out Width based on widthMode
if(widthMode == MeasureSpec.EXACTLY)
// set user specified Width
reqWidth = widthSize;
else
// find out the total pixel size required for first and last text
reqWidth = (int)(mPaint.measureText(text)) ;
// find out Height based on heightMode
if(heightMode == MeasureSpec.EXACTLY)
// set user specified Height
reqHeight = heightSize;
else
// get the default height of the Font
reqHeight = (int) mPaint.getTextSize();
// set the calculated width and height of your drawing area
setMeasuredDimension(reqWidth, reqHeight);
}
}
and for each row ofmy ListView I have created a xml structure consisting of a TextView,My custom class, and an image
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="w开发者_如何转开发rap_content"
android:gravity="left|center"
android:layout_width="wrap_content"
android:paddingBottom="5px"
android:paddingTop="5px"
android:paddingLeft="5px">
<TextView android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dip"
android:gravity="center"
android:background="@drawable/bg"
android:textColor="#FFFF00"
android:text="hi"/>
<!--<TextView android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10px"
android:text="hi"/>
-->
<com.example.CustomTextView
android:id="@+id/TextView02"
android:layout_width="fill_parent"
android:layout_height="50px"
/>
<ImageView android:id = "@+id/image"
android:src="@drawable/icon"
android:layout_width = "50dip"
android:layout_height = "50dip"
/>
</AbsoluteLayout>
In the Adapter class of my ListView I am retrieving the structure like this
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflator.inflate(R.layout.listview, null);
convertView.setMinimumHeight(80);
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.TextView01);
holder.text2 = (CustomTextView) convertView
.findViewById(R.id.TextView02);
}
But I am getting inflate exception on
convertView = mInflator.inflate(R.layout.listview, null);
However, if instead of my custom view , I add a simple textView in layout.xml(layout structure of each row of listview) then everything works fine
I have searched forums but I am not getting what i am doing wrong.
Please help me in this case.
I don't know if this is the cause of your error, but your constructors call the init()
function, and the init function uses that mPaint
variable.
The mPaint
variable is declared as Paint mPaint;
, but it is never instantiated, so it is null. You'll be getting a nullPointerException
there i think
I don't know how the constructor of mPaint
works, but you need to do something like this before you can use it:
mPaint = new Paint mPaint();
edit: ah: i'm seeing that your onDraw()
does use Paint paint = new Paint();
. But that might be a bit too late?
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