Android 使用長按選單取得Drawable圖片的寬高, ContextMenu, Bitmap, BitmapFactory.decodeResource()

EX0701.java

package com.example.administrator.test;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

/**
 * Created by Administrator on 2014/10/12.
 */
public class EX0701 extends Activity {
    private TextView mTextView;
    private ImageView mImageView;

    /* 宣告Context Menu的選項常量 */
    protected final static int CONTEXT_ITEM1 = Menu.FIRST;
    protected final static int CONTEXT_ITEM2 = Menu.FIRST + 1;
    protected final static int CONTEXT_ITEM3 = Menu.FIRST + 2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ex0701);

        mTextView = (TextView) findViewById(R.id.myTextView);
        mImageView = (ImageView) findViewById(R.id.myImageView);

        /* 將Drawable中的圖片, 放入自定義的ImageView中 */
        mImageView.setImageDrawable(getResources().getDrawable(R.drawable.ssd_poker_ace));

        /* 設置OnCreateContextMenuListener給TextView
         * 在圖片上, 使用ContextMenu */
        mImageView.setOnCreateContextMenuListener(new ListView.OnCreateContextMenuListener() {
            @Override
            public void onCreateContextMenu(
                    ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {

                menu.add(Menu.NONE, CONTEXT_ITEM1, 0, "取得圖片寬度");
                menu.add(Menu.NONE, CONTEXT_ITEM2, 0, "取得圖片高度");
                menu.add(Menu.NONE, CONTEXT_ITEM3, 0, "取得圖片寬高");
            }
        });
    }

    /* 重寫OnContextItemSelected來定義用戶單擊menu後的動作 */
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        /* 自定義Bitmap對象, 並通過BitmapFactory.decodeResource取得
         * 預先Import至 Drawable的圖片*/
        Bitmap myBmp = BitmapFactory.decodeResource(getResources(), R.drawable.ssd_poker_ace);

        int intHeight = myBmp.getHeight();
        int intWidth = myBmp.getWidth();
        String strOpt;

        try {
            /* 菜單選項與動作 */
            switch (item.getItemId()) {
                /* 顯示寬度 */
                case CONTEXT_ITEM1:
                    strOpt = "寬度 = " + Integer.toString(intWidth);
                    mTextView.setText(strOpt);
                    break;
                case CONTEXT_ITEM2:
                    strOpt = "高度 = " + Integer.toString(intHeight);
                    mTextView.setText(strOpt);
                    break;
                case CONTEXT_ITEM3:
                    strOpt = "寬度 = " + Integer.toString(intWidth) + "\n";
                    strOpt += "高度 = " + Integer.toString(intHeight);
                    mTextView.setText(strOpt);
                    break;
                default:
                    break;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return super.onContextItemSelected(item);
     }
}

ex0701.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/myTextView" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myImageView" />
</LinearLayout>