将 Picasso 集成到自定义图像视图中
Integrate Picasso inside Custom Image View
我正在尝试构建自定义图像视图并在 class 内部使用 Picasso 以避免在 activity 代码中设置图像。
我尝试了不同的路径,但 none 会起作用。
这是我的习惯 class
package com.mycompany.picassoimageview;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
import android.net.Uri;
import android.os.Build;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
import java.io.IOException;
/**
* TODO: document your custom view class.
*/
public class PicassoImageView extends ImageView {
int imgsrc;
Bitmap bmp;
Paint pnt;
Picasso pcs;
public PicassoImageView(Context context) {
super(context);
init(context,null);
}
private void init(Context ctx, AttributeSet a) {
pcs = Picasso.with(ctx);
pnt = new Paint();
pnt.setAntiAlias(true);
if(a != null) {
imgsrc = a.getAttributeResourceValue(R.styleable.PicassoImageView_msrc, 0);
if (imgsrc != 0) {
try {
bmp = pcs.load(imgsrc).get();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public PicassoImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context,attrs);
}
public PicassoImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context,attrs);
}
@Override
protected void onDraw(Canvas canvas) {
//super.onDraw(canvas);
// TODO: consider storing these as member variables to reduce
// allocations per draw cycle.
int paddingLeft = getPaddingLeft();
int paddingTop = getPaddingTop();
// Draw the text.
if(bmp != null)
{
bmp.prepareToDraw();
canvas.drawBitmap(bmp,(float)paddingLeft,(float)paddingTop,pnt);
}
}
@Override
public void setImageResource(int resId) {
try {
bmp = Picasso.with(getContext()).load(resId).get();
invalidate();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void setImageURI(Uri uri) {
try {
bmp = Picasso.with(getContext()).load(uri).get();
invalidate();
} catch (IOException e) {
e.printStackTrace();
}
}
}
现在,问题出在 init() 方法中,上下文确实存在,但 a.getAttributeResourceValue 总是无法 return [=29= 的地址];因此该值始终为零并且 bmp 为 null
这是属性文件:
<resources>
<declare-styleable name="PicassoImageView">
<attr name="msrc" format="integer" /> <!-- tried "reference" too -->
</declare-styleable>
</resources>
这是使用视图的 activity xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.mycompany.picassoimageview.MainActivity">
<com.mycompany.picassoimageview.PicassoImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#efff11"
app:msrc="@drawable/data_icons"/>
</LinearLayout>
而在 activity class 中没有任何反应:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
在阅读了几个示例后,我发现问题出在我读取属性的方式上。而不是这个:
imgsrc = a.getAttributeResourceValue(R.styleable.PicassoImageView_msrc, 0);
我应该用这个:
TypedArray ta = ctx.obtainStyledAttributes(a, R.styleable.PicassoImageViewClass);
int q = ta.getResourceId(R.styleable.PicassoImageViewClass_msrc,-1);
if(q>0)
imgSrc = q;
ta.recycle();
我正在尝试构建自定义图像视图并在 class 内部使用 Picasso 以避免在 activity 代码中设置图像。 我尝试了不同的路径,但 none 会起作用。 这是我的习惯 class
package com.mycompany.picassoimageview;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
import android.net.Uri;
import android.os.Build;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
import java.io.IOException;
/**
* TODO: document your custom view class.
*/
public class PicassoImageView extends ImageView {
int imgsrc;
Bitmap bmp;
Paint pnt;
Picasso pcs;
public PicassoImageView(Context context) {
super(context);
init(context,null);
}
private void init(Context ctx, AttributeSet a) {
pcs = Picasso.with(ctx);
pnt = new Paint();
pnt.setAntiAlias(true);
if(a != null) {
imgsrc = a.getAttributeResourceValue(R.styleable.PicassoImageView_msrc, 0);
if (imgsrc != 0) {
try {
bmp = pcs.load(imgsrc).get();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public PicassoImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context,attrs);
}
public PicassoImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context,attrs);
}
@Override
protected void onDraw(Canvas canvas) {
//super.onDraw(canvas);
// TODO: consider storing these as member variables to reduce
// allocations per draw cycle.
int paddingLeft = getPaddingLeft();
int paddingTop = getPaddingTop();
// Draw the text.
if(bmp != null)
{
bmp.prepareToDraw();
canvas.drawBitmap(bmp,(float)paddingLeft,(float)paddingTop,pnt);
}
}
@Override
public void setImageResource(int resId) {
try {
bmp = Picasso.with(getContext()).load(resId).get();
invalidate();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void setImageURI(Uri uri) {
try {
bmp = Picasso.with(getContext()).load(uri).get();
invalidate();
} catch (IOException e) {
e.printStackTrace();
}
}
}
现在,问题出在 init() 方法中,上下文确实存在,但 a.getAttributeResourceValue 总是无法 return [=29= 的地址];因此该值始终为零并且 bmp 为 null
这是属性文件:
<resources>
<declare-styleable name="PicassoImageView">
<attr name="msrc" format="integer" /> <!-- tried "reference" too -->
</declare-styleable>
</resources>
这是使用视图的 activity xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.mycompany.picassoimageview.MainActivity">
<com.mycompany.picassoimageview.PicassoImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#efff11"
app:msrc="@drawable/data_icons"/>
</LinearLayout>
而在 activity class 中没有任何反应:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
在阅读了几个示例后,我发现问题出在我读取属性的方式上。而不是这个:
imgsrc = a.getAttributeResourceValue(R.styleable.PicassoImageView_msrc, 0);
我应该用这个:
TypedArray ta = ctx.obtainStyledAttributes(a, R.styleable.PicassoImageViewClass);
int q = ta.getResourceId(R.styleable.PicassoImageViewClass_msrc,-1);
if(q>0)
imgSrc = q;
ta.recycle();