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。