Android viewpager+photoview的使用
可实现多张图片点击放大，手指控制，左右滑动，多张图片点击任意位置定位显示任意位置图片；无动画
核心代码：
viewpager:
public class PhotoViewPager extends ViewPager {
public PhotoViewPager(Context context) {
super(context);
}
public PhotoViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
try {
return super.onInterceptTouchEvent(ev);
} catch (IllegalArgumentException e) {
e.printStackTrace();
return false;
}
}
}adapter:
public class PageAdapter extends PagerAdapter {
List imagesUrl;
Context context;
public PageAdapter(List imagesUrl, Context context) {
this.imagesUrl = imagesUrl;
this.context = context;
}
@Override
public int getCount() {
return (imagesUrl == null || imagesUrl.size() == 0) ? 0 : imagesUrl.size();
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
String url = imagesUrl.get(position);
PhotoView photoView = new PhotoView(context);
Glide.with(context)
.load("http://test.zuihou99.com" + url)
.into(photoView);
container.addView(photoView);
photoView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
return photoView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
} activity里有保存图片到本地相册的功能实现代码如下:
public class ImageBigActivity extends BaseActivity implements EasyPermissions.PermissionCallbacks {
@Bind(R.id.page)
TextView page;
@Bind(R.id.top)
RelativeLayout top;
@Bind(R.id.viewPager)
PhotoViewPager viewPager;
@Bind(R.id.save)
TextView save;
ArrayList imagesUrl;
int current;
PageAdapter pagerAdapter;
private static final int REQUEST_CODE_SAVE_IMG = 10;
@Override
public int getLayoutId() {
return R.layout.imagebig_layout;
}
@Override
public void initView() {
}
@Override
public void initData() {
if (getIntent() != null) {
Intent intent = getIntent();
imagesUrl = intent.getStringArrayListExtra("images");
current = intent.getIntExtra("position", 0);
}
pagerAdapter = new PageAdapter(imagesUrl, getApplicationContext());
viewPager.setAdapter(pagerAdapter);
viewPager.setCurrentItem(current);
page.setText(current + 1 + "/" + imagesUrl.size());
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
current = position;
page.setText(current + 1 + "/" + imagesUrl.size());
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
@OnClick(R.id.save)
public void save() {
requestPermission();
}
/**
* 请求读取sd卡的权限
*/
private void requestPermission() {
if (Build.VERSION.SDK_INT >= 23) {
//读取sd卡的权限
String[] mPermissionList = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
if (EasyPermissions.hasPermissions(getApplicationContext(), mPermissionList)) {
//已经同意过
saveImage();
} else {
//未同意过,或者说是拒绝了，再次申请权限
EasyPermissions.requestPermissions(
this, //上下文
"保存图片需要读取sd卡的权限", //提示文言
REQUEST_CODE_SAVE_IMG, //请求码
mPermissionList //权限列表
);
}
} else {
saveImage();
}
}
/**
* 保存图片
*/
private void saveImage() {
System.out.println(" 6666 ");
System.out.println(current + " current ");
final String urls = imagesUrl.get(current);
System.out.println(urls + " url ");
System.out.println(" 8888 ");
// Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.fj);
new Thread(new Runnable() {
Bitmap bitmap = null;
@Override
public void run() {
URL url = null;
try {
url = new URL("http://test.zuihou99.com" + urls);
InputStream is = null;
BufferedInputStream bis = null;
try {
is = url.openConnection().getInputStream();
bis = new BufferedInputStream(is);
bitmap = BitmapFactory.decodeStream(bis);
boolean isSaveSuccess = ImgUtils.saveImageToGallery(getApplicationContext(), bitmap);
if (isSaveSuccess) {
Looper.prepare();
Toast.makeText(getApplicationContext(), "保存图片成功", Toast.LENGTH_SHORT).show();
Looper.loop();
} else {
Looper.prepare();
Toast.makeText(getApplicationContext(), "保存图片失败，请稍后重试", Toast.LENGTH_SHORT).show();
Looper.loop();
}
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
}).start();
}
/**
* 根据图片的url路径获得Bitmap对象
*
* @param url
* @return
*/
private Bitmap decodeUriAsBitmapFromNet(String url) {
URL fileUrl = null;
Bitmap bitmap = null;
try {
fileUrl = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) fileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
//授权结果，分发下去
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// Forward results to EasyPermissions
//跳转到onPermissionsGranted或者onPermissionsDenied去回调授权结果
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}
//同意授权
@Override
public void onPermissionsGranted(int requestCode, List list) {
saveImage();
}
//拒绝授权
@Override
public void onPermissionsDenied(int requestCode, List perms) {
if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
//打开系统设置，手动授权
new AppSettingsDialog.Builder(this).build().show();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == AppSettingsDialog.DEFAULT_SETTINGS_REQ_CODE) {
//拒绝授权后，从系统设置了授权后，返回APP进行相应的操作
saveImage();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// TODO: add setContentView(...) invocation
ButterKnife.bind(this);
}
}
startActivity跳转代码：
private void statPhotoViewActivity(int position) {
Intent intent = new Intent(this, ImageBigActivity.class);
intent.putStringArrayListExtra("images", imagesList);
intent.putExtra("position", position);
startActivity(intent);
}activity布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/top"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:paddingLeft="@dimen/margin_8"
android:paddingRight="@dimen/margin_8">
<ImageView
android:id="@+id/back"
android:layout_width="15dp"
android:layout_height="15dp"
android:layout_centerVertical="true"
android:onClick="back"
android:scaleType="centerCrop"
android:src="@mipmap/ic_image_back" />
<TextView
android:id="@+id/page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text=""
android:textColor="@color/homepage_type_bg"
android:textSize="@dimen/font_15" />
RelativeLayout>
<com.zuihou.drunkenmonkey.widget.view.PhotoViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/top"
android:background="#444444" />
<TextView
android:id="@+id/save"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:clickable="true"
android:gravity="right"
android:paddingRight="@dimen/margin_16"
android:text="保存"
android:textColor="@color/homepage_type_bg"
android:textSize="@dimen/font_16" />
RelativeLayout>