Android 自定义显示图片Dialog

效果图：

• 布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
tools:ignore="ContentDescription" />

</RelativeLayout>

• 新建style样式

<style name="ShowImageDialog" parent="@android:style/Theme.Dialog">
<item name="android:windowIsFloating">true</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:background">@android:color/transparent</item>
<item name="android:backgroundDimEnabled">true</item>
</style>

• 新建ShowImageDialog继承Dialog：

import android.annotation.SuppressLint;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;

public class DzShowImageDialog extends Dialog {

private Object showImage;

public DzShowImageDialog(Context context, Object showImage) {
super(context, R.style.ShowImageDialog);
this.showImage = showImage;
}

@SuppressLint("ResourceType")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog_showimage);

ImageView imageView = findViewById(R.id.imageView);
MyCommon.setViewContent(imageView, showImage);

setCanceledOnTouchOutside(true); // 设置点击屏幕或物理返回键，dialog是否消失
Window w = getWindow();
assert w != null;
WindowManager.LayoutParams lp = w.getAttributes();
lp.x = 0;
lp.y = 40;
onWindowAttributesChanged(lp);
imageView.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View view) {
dismiss();
}
});
}
}

• 附MyCommon方法

/**
* 设置 ImageView 的显示内容。
*
* @param content
*            支持 null，Integer(ResID)，Bitmap，Drawable。
*/
public static boolean setViewContent(ImageView view, Object content) {
if (view == null)
return false;

Object tagValue = getTagValue(content);
if (view.getTag(R.string.setTagKey_content).equse(tagValue))
return view.getDrawable() != null;
view.setTag(R.string.setTagKey_content, tagValue);

Drawable real = getDrawable(view, content);
view.setImageDrawable(real);
return (real != null);
}

/**
* 为指定 View 准备其需要使用的 Drawable 对象。
*/
@SuppressWarnings("deprecation")
public static Drawable getDrawable(View view, Object drawable) {
if (view == null)
return null;

if (drawable == null)
return null;

Drawable real = null;
try {
if (drawable instanceof DzInteger)
drawable = ((DzInteger) drawable).value;
if (drawable instanceof Integer) {
int resId = (Integer) drawable;
if (resId == 0)
return null;
real = view.getResources().getDrawable(resId);
} else if (drawable instanceof Drawable) {
real = (Drawable) drawable;
} else if (drawable instanceof Bitmap) {
real = new BitmapDrawable(view.getResources(), (Bitmap) drawable);
}
} catch (Throwable e) {
Log.e("", "MyCommon.getViewDrawable(.., ..) failed for %s", e.toString());
}

// 需要设置一下，否则在 TextView 中显示不出来
if (real != null) {
real.setBounds(0, 0, real.getMinimumWidth(), real.getMinimumHeight());
}

return real;
}

• 使用示例

使用的话只需要调用 new ShowImageDialog(context , 图片).show(); 即可。