对话框中的图像(Image in a dialog)

对话框中的图像(Image in a dialog)

我正在尝试在对话框中显示一个ImageView，我已经按照几个例子，但是当我打开应用程序关闭的对话框时，它们似乎都没有工作。

<ImageView android:id="@+id/image" android:contentDescription="@string/desc1" android:layout_width="wrap_content" android:layout_height="wrap_content" />

这就是我在MainActivity中的含义

button1.setOnLongClickListener(new OnLongClickListener() { public boolean onLongClick(View v) { AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create(); dialog.setTitle("Title"); ImageView img = (ImageView) findViewById(R.id.image); img.setImageResource(R.drawable.dust); dialog.setView(img); dialog.show(); return false; } }); }

使用这个新代码我已经能够显示内部图像的对话框，我也能够旋转图像

button1.setOnLongClickListener(new OnLongClickListener() { public boolean onLongClick(View v) { Dialog dialog = new Dialog(MainActivity.this); LayoutInflater inflater = LayoutInflater.from(MainActivity.this); RotateAnimation anim = new RotateAnimation(0f, 360f, 200f, 200f); anim.setInterpolator(new LinearInterpolator()); anim.setRepeatCount(Animation.INFINITE); anim.setDuration(10000); dialog.setTitle("You have found the easter egg!"); View view = inflater.inflate(R.layout.activity_main2, null); dialog.setContentView(view); view.startAnimation(anim); dialog.show(); return false; } }); }

I'm trying to display an ImageView in a dialog, I've followed several examples but none of them seem to work as when I open the dialog the app closes.

<ImageView android:id="@+id/image" android:contentDescription="@string/desc1" android:layout_width="wrap_content" android:layout_height="wrap_content" />

This is what I have in my MainActivity

button1.setOnLongClickListener(new OnLongClickListener() { public boolean onLongClick(View v) { AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create(); dialog.setTitle("Title"); ImageView img = (ImageView) findViewById(R.id.image); img.setImageResource(R.drawable.dust); dialog.setView(img); dialog.show(); return false; } }); }

Using this new code I have been able to display the dialog with the image inside and I have also been able to rotate the image

button1.setOnLongClickListener(new OnLongClickListener() { public boolean onLongClick(View v) { Dialog dialog = new Dialog(MainActivity.this); LayoutInflater inflater = LayoutInflater.from(MainActivity.this); RotateAnimation anim = new RotateAnimation(0f, 360f, 200f, 200f); anim.setInterpolator(new LinearInterpolator()); anim.setRepeatCount(Animation.INFINITE); anim.setDuration(10000); dialog.setTitle("You have found the easter egg!"); View view = inflater.inflate(R.layout.activity_main2, null); dialog.setContentView(view); view.startAnimation(anim); dialog.show(); return false; } }); }

最满意答案

when I open the dialog the app closes.

因为您的对话框ImageView img为null

ImageView img = (ImageView) dialog.findViewById(R.id.image); // <--- img is not visible through dialog.. img.setImageResource(R.drawable.dust); // <--- this line throw exception

只需像这样更改您的代码，

AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create(); LayoutInflater inflater = LayoutInflater.from(MainActivity.this); dialog.setTitle("Title"); View view = inflater.inflate(R.layout.<xml_image>, null); // xml Layout file for imageView ImageView img = (ImageView) view.findViewById(R.id.image); img.setImageResource(R.drawable.dust); dialog.setView(view); dialog.show(); when I open the dialog the app closes.

Because your dialog ImageView img is null

ImageView img = (ImageView) dialog.findViewById(R.id.image); // <--- img is not visible through dialog.. img.setImageResource(R.drawable.dust); // <--- this line throw exception

Just Change your code like this,

AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create(); LayoutInflater inflater = LayoutInflater.from(MainActivity.this); dialog.setTitle("Title"); View view = inflater.inflate(R.layout.<xml_image>, null); // xml Layout file for imageView ImageView img = (ImageView) view.findViewById(R.id.image); img.setImageResource(R.drawable.dust); dialog.setView(view); dialog.show();