我从SD Card中获取图像,然后把图像动态的添加到HorizontalScrollview中的LinearLayout里。现在当我点击一个图像时,我想在同一个activity中的另一个 ImageView 中,把特定的图像显示成大图像。如何实现?我使用 getting getId(),getTag(),但是没有实现。另外,我不想使用gallery widget ,因为中心锁定功能的缘故。
package com.pop.cam;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;
public class GalleryView extends Activity {
ImageView iv;
File[] sdDirFiles;
LinearLayout linearLayout;
int i;
String path;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pictures);
linearLayout = (LinearLayout) findViewById(R.id.linearView);
iv = (ImageView) findViewById(R.id.ImageView);
// getting images from SD card folder
File sdDir = new File("/sdcard/Pictures/"
+ MyCameraAppActivity.DIR_NAME);
sdDirFiles = sdDir.listFiles();
for (i = 0; i < sdDirFiles.length; i++) {
final ImageView imageView = new ImageView(this);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new LayoutParams(130, 100));
Bitmap b = decodeFile(sdDirFiles[i].getAbsoluteFile());
imageView.setImageBitmap(b);
path = sdDirFiles[i].getAbsolutePath();
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Here i want to set clicked image as big.
//I tried following but not workin
iv.setImageResource(v.getId());
iv.setImageURI(Uri.parse(path));
Bitmap b = decodeFile(sdDirFiles[Integer.valueOf(v.getId())].getAbsoluteFile());
iv.setImageBitmap(b);
}
});
linearLayout.addView(imageView);
}
}
// decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 70;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE
&& o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
}
pictures.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<HorizontalScrollView
android:id="@+id/horizontalScorllView"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
</LinearLayout>
</HorizontalScrollView>
<ImageView
android:id="@+id/ImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:contentDescription="@string/app_name" >
</ImageView>
</LinearLayout>