python for android : 显示图片

参考: https://code.google.com/p/android-scripting/wiki/FullScreenUI

这是一个简单的图片查看小程序 ，只有基本功能： back  选图片 next  ，还有一个没能实现的功能:横屏显示。

imageview.py

# -*- coding: utf-8 -*-
import android
import os,sys,time
reload(sys)
sys.setdefaultencoding('utf-8')
droid = android.Android()

base_dir = '/mnt/sdcard/DCIM/'
if not os.path.isdir(base_dir):
    print base_dir,'is not dir'
    sys.exit(4)

def show_dir(path=base_dir):
    """Shows the contents of a directory in a list view."""
    
    nodes = sorted(os.listdir(path))
    # Make a way to go up a level.
    if path != base_dir: nodes.insert(0, '..')
    droid.dialogCreateAlert(os.path.basename(path).title())
    droid.dialogSetItems(nodes)
    droid.dialogShow()

    # Get the selected file or directory.
    result = droid.dialogGetResponse().result
    droid.dialogDismiss()
    if 'item' not in result:
        return
    target = nodes[result['item']]
    target_path = os.path.join(path, target)
    if target == '..':
        target_path = os.path.dirname(path)
    
    if os.path.isdir(target_path):
        return show_dir(target_path)
    elif os.path.splitext(target)[1].lower() in ('.jpg','.png'):
        return target_path
    # inform the user.
    else:
        droid.makeToast('Only .jpg .png files are currently supported!')
        return

target_path = None
target = ''
path =''
alist =[]

def init():
    global target_path, target,path,nodes
    target_path = show_dir()
    path = os.path.dirname(target_path)
    alist = imagelist(path)
    show_image()
    return

def show_image():
    global target_path, target,path
    if target_path is None: return
    if os.path.exists(target_path):
        target = os.path.basename(target_path)
        img = 'file://' + target_path
        droid.fullSetProperty("imageView","src",img)
    else:
        droid.makeToast('Error: %s not exists',path)
    return

def imagelist(path):
    global alist
    nodes = sorted(os.listdir(path))
    alist =[]
    for f in nodes:
        if os.path.splitext(f)[1].lower() in ('.jpg','.png'):
            alist.append(f)
    return

def back():
    global target_path,target, alist
    j = None
    for i in range(0,len(alist)):
        if alist[i]==target:
            j=i
            break
    if j is None: return
    if j >0:
        target = alist[j-1]
        target_path = os.path.join(path, target)
        show_image()
    else:
        droid.makeToast('this is begin image')
    return

def next():
    global target_path,target, alist
    j = None
    len1 = len(alist)
    for i in range(0,len1):
        if alist[i]==target:
            j=i
            break
    if j is None: return
    if j < len1-1:
        target = alist[j+1]
        target_path = os.path.join(path, target)
        show_image()
    else:
        droid.makeToast('this is end image')
    return

def sensor():
    droid.startSensingTimed(1, 250)
    s4 = droid.sensorsReadAccelerometer().result
    x,y,z =s4    
    if x<1.0 and y>3.0 :
        droid.makeToast('portrait  纵向 ')
    if x>3.0 and y<1.0 :
        droid.makeToast('landscape 横向 ')
    if x<1.0 and y<1.0 :
        droid.makeToast('horizontal 水平')
    return

def eventloop():
  while True:
    event=droid.eventWait().result
    if event["name"]=="click":
      id=event["data"]["id"]
      if id=="image":
        init()
      if id=="next":
        next()
      if id=="back":
        back()
      if id=="sensor":
        sensor()
      if id=="Exit":
        return
    elif event["name"]=="screen":
      if event["data"]=="destroy":
        return

layout = """<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/background"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent" android:background="#ff000000">
  <LinearLayout android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
        <Button
            android:id="@+id/Exit"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:text="退出"
            />
        <Button
            android:id="@+id/back"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:text="《"
            />
        <Button
            android:id="@+id/image"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:text="图片"
            />
        <Button
            android:id="@+id/next"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:text="》"
            />
        <Button
            android:id="@+id/sensor"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:text="目"
            />            
  </LinearLayout>

  <ImageView
    android:id="@+id/imageView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:adjustViewBounds="true"
    />

</LinearLayout>
"""

droid.fullShow(layout)
eventloop()
droid.fullDismiss()