从文件路径创建位图/可绘制

时间:2013-05-29 02:10:00

标签: java android android-drawable bitmapfactory

我正在尝试从现有文件路径创建一个Bitmap或Drawable。

String path = intent.getStringExtra("FilePath");
BitmapFactory.Options option = new BitmapFactory.Options();
option.inPreferredConfig = Bitmap.Config.ARGB_8888;

mImg.setImageBitmap(BitmapFactory.decodeFile(path));
// mImg.setImageBitmap(BitmapFactory.decodeFile(path, option));
// mImg.setImageDrawable(Drawable.createFromPath(path));
mImg.setVisibility(View.VISIBLE);
mText.setText(path);

setImageBitmap()setImageDrawable()未显示路径中的图片。我使用mText打印了路径,它看起来像:/storage/sdcard0/DCIM/100LGDSC/CAM00001.jpg

我做错了什么?有人可以帮帮我吗?

7 个答案:

答案 0 :(得分:122)

从文件路径创建位图:

File sd = Environment.getExternalStorageDirectory();
File image = new File(sd+filePath, imageName);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
bitmap = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true);
imageView.setImageBitmap(bitmap);

如果要将位图缩放到父级的高度和宽度,请使用Bitmap.createScaledBitmap函数。

我认为你提供了错误的文件路径。 :)希望这有帮助。

答案 1 :(得分:53)

它对我有用:

File imgFile = new  File("/sdcard/Images/test_image.jpg");
if(imgFile.exists()){
    Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
    //Drawable d = new BitmapDrawable(getResources(), myBitmap);
    ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);
    myImage.setImageBitmap(myBitmap);

}

修改

如果上面的硬编码sdcard目录在你的情况下不起作用,你可以获取sdcard路径:

String sdcardPath = Environment.getExternalStorageDirectory().toString();
File imgFile = new  File(sdcardPath);

答案 2 :(得分:32)

这是一个解决方案:

Bitmap bitmap = BitmapFactory.decodeFile(filePath);

答案 3 :(得分:3)

好吧,使用静态Drawable.createFromPath(String pathName)对我来说比自己解码更简单......: - )

如果您的mImg是一个简单的ImageView,您甚至不需要它,直接使用mImg.setImageUri(Uri uri)

答案 4 :(得分:1)

static ArrayList< Drawable>  d;
d = new ArrayList<Drawable>();
for(int i=0;i<MainActivity.FilePathStrings1.size();i++) {
  myDrawable =  Drawable.createFromPath(MainActivity.FilePathStrings1.get(i));
  d.add(myDrawable);
}

答案 5 :(得分:1)

对于 Drawable -
Drawable drawable = Drawable.createFromPath(your path in string);
对于位图 -
Bitmap bitmap = BitmapFactory.decodeFile(your path in string);

多么简单,希望你喜欢

答案 6 :(得分:0)

您无法通过路径访问您的drawable,因此如果您想要一个可绘制的人类可读界面,您可以以编程方式构建。

在你班级的某处声明一个HashMap:

private static HashMap<String, Integer> images = null;

//Then initialize it in your constructor:

public myClass() {
  if (images == null) {
    images = new HashMap<String, Integer>();
    images.put("Human1Arm", R.drawable.human_one_arm);
    // for all your images - don't worry, this is really fast and will only happen once
  }
}

现在进行访问 -

String drawable = "wrench";
// fill in this value however you want, but in the end you want Human1Arm etc
// access is fast and easy:
Bitmap wrench = BitmapFactory.decodeResource(getResources(), images.get(drawable));
canvas.drawColor(Color .BLACK);
Log.d("OLOLOLO",Integer.toString(wrench.getHeight()));
canvas.drawBitmap(wrench, left, top, null);