我有一个图像视图,我想获取它的位图...
这是我的代码:
设置图像视图:
ImageView imageView;
imageView = findViewById(R.id.image_wallpaper);
Glide.with(this).load(current_image.getImageURL()).into(imageView);
获取位图:
setButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
DisplayMetrics metrics = new DisplayMetrics();
imageView.invalidate(); // I get the crash with or without that line
Bitmap mBitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); // CRASH HERE
// more things using the mBitmap
}
});
崩溃日志:
Fatal Exception: java.lang.NullPointerException
Attempt to invoke virtual method 'android.graphics.Bitmap android.graphics.drawable.BitmapDrawable.getBitmap()' on a null object reference
com.XXXX.XXXXXXX.ImageActivity$4.onClick (ImageActivity.java:170)
android.view.View.performClick (View.java:5246)
android.view.View$PerformClick.run (View.java:21200)
android.os.Handler.handleCallback (Handler.java:739)
android.os.Handler.dispatchMessage (Handler.java:95)
android.os.Looper.loop (Looper.java:145)
android.app.ActivityThread.main (ActivityThread.java:6946)
java.lang.reflect.Method.invoke (Method.java)
java.lang.reflect.Method.invoke (Method.java:372)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1404)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1199)
我使用的是Glide的最新版本:
implementation 'com.github.bumptech.glide:glide:4.9.0' // glide
此崩溃日志来自Firebase Crashlytics,很多用户都遇到了该错误,但是我无法在我的设备上重现它。
有什么问题?我该如何解决?
谢谢
您能否发布imageView初始化?如果没有完成,则需要先初始化它:
ImageView imageView = findViewById(R.id.myimageViewId);
[Glide库中有一种方法,您可以在其中获取位图,可以使用该方法获取位图并设置为Imageview。
您还可以使用可绘制的资源代替“图像路径”。
Glide.with(context)
.asBitmap()
.placeholder(placeholder)
.error(placeholder)
.load(
"imagepath"
)
.into(object : CustomTarget<Bitmap>() {
override fun onResourceReady(resource: Bitmap, transition: Transition<in Bitmap>?) {
// here you will get Bitmap file and you can use it to set on image view.
image.setImageBitmap(resource)
}
override fun onLoadCleared(placeholder: Drawable?) {
// this is called when imageView is cleared on lifecycle call or for some other reason.
// if you are referencing the bitmap somewhere else too other than this imageView clear it here as you can no longer have the bitmap.
}
})
添加依赖项:
implementation 'com.github.bumptech.glide:glide:3.7.0'
并在下面的代码段中写:
try {
Glide.with(getApplicationContext())
.load(YOUR_IMAGE_URL)
.asBitmap()
.into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
Uri bmpUri = Common.getLocalBitmapUri(resource, context);
your_image_view.setImageBitmap(resource);
}
@Override
public void onLoadFailed(Exception e, Drawable errorDrawable) {
super.onLoadFailed(e, errorDrawable);
}
});
} catch (Exception e) {
e.getStackTrace();
}
希望这可以帮助您