1 簡介
本篇主要分析源碼中的demo.
2 主界面LauncherActivity
class LauncherActivity extends ListActivity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, options));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {..}3 SimpleSampleActivity
use
// The MAGIC happens here!
mAttacher = new PhotoViewAttacher(mImageView);
// Lets attach some listeners, not required though!
mAttacher.setOnMatrixChangeListener(new MatrixChangeListener());字符串的格式化
static final String PHOTO_TAP_TOAST_STRING = "Photo Tap! X: %.2f %% Y:%.2f %% ID: %d";
String.format(PHOTO_TAP_TOAST_STRING, 33.4534, 33.456, 123);
// result : Photo Tap! X: 33.45 % Y:33.46 % ID: 123
static final String SCALE_TOAST_STRING = "Scaled to: %.2ff";
String.format(SCALE_TOAST_STRING, 98.666);
// result : Scaled to: 98.67fToast
private Toast mCurrentToast;
private void showToast(CharSequence text) {
if (null != mCurrentToast) {
mCurrentToast.cancel();
}
mCurrentToast = Toast.makeText(SimpleSampleActivity.this, text, Toast.LENGTH_SHORT);
mCurrentToast.show();
}Menu
android:showAsAction="never"
你的應用程序目標設爲蜂巢平臺（即 Android 3.0）時,可以利用Action Bar將你的選項菜單項放在Action Bar的右上角,
never:這個值菜單永遠不會出現在ActionBar,withText:這個值使菜單和它的圖標，菜單文本一起顯示等等其他，
而demo中沒有用到actionbar
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem zoomToggle = menu.findItem(R.id.menu_zoom_toggle);
assert null != zoomToggle;
// assert <boolean表達式>,爲true，則程序繼續執行,爲false，則程序拋出AssertionError，並終止執行
zoomToggle.setTitle(mAttacher.canZoom() ? R.string.menu_zoom_disable : R.string.menu_zoom_enable); // 改變一個菜單條目的名字
return super.onPrepareOptionsMenu(menu);
}菜單顯示圖1
依次表示：是否允許縮放；修改scale_type類型，如
case R.id.menu_scale_fit_start:
mAttacher.setScaleType(ScaleType.FIT_START);
return true;設置mAttacher類型後，mAttacher的顯示便會自動調整爲所顯示的類型了
點擊更多–菜單顯示圖2
隨機縮放大小–nextFloat()：in the half-open range [0.0, 1.0).
case R.id.menu_scale_random_animate: // 漸變
case R.id.menu_scale_random: //直接設定
Random r = new Random();
float minScale = mAttacher.getMinimumScale();
float maxScale = mAttacher.getMaximumScale();
float randomScale = minScale + (r.nextFloat() * (maxScale - minScale));
mAttacher.setScale(randomScale, item.getItemId() == R.id.menu_scale_random_animate);
showToast(String.format(SCALE_TOAST_STRING, randomScale));
return true;display matrix的先保存與後恢復，似乎有點問題啊，獲取的是mDrawMatrix的值，但恢復時設置的卻是mSuppMatrix。
extract_visible_bitmap
case R.id.extract_visible_bitmap:
try { // 通過imageView.getDrawingCache()獲取bmp，獲取的是完整的圖片bmp
Bitmap bmp = mAttacher.getVisibleRectangleBitmap();
// /storage/emulated/0/Download/photoview-1792004975.png
File tmpFile = File.createTempFile("photoview", ".png",Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS));
FileOutputStream out = new FileOutputStream(tmpFile);
// 壓縮保存bmp，第二個參數 0-100. 0 meaning compress for small size，100爲最優
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
Intent share = new Intent(Intent.ACTION_SEND);
share.setType("image/png");
share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(tmpFile));
startActivity(share);
Toast.makeText(this, String.format("Extracted into: %s", tmpFile.getAbsolutePath()), Toast.LENGTH_SHORT).show();
} catch (Throwable t) {
// ..
}
return true;onDestroy
// Need to call clean-up
mAttacher.cleanup();4 ViewPagerActivity
HackyViewPager：是否允許自身的觸摸事件
public class HackyViewPager extends ViewPager {
private boolean isLocked;
public HackyViewPager(Context context) {
super(context);
isLocked = false;
}
public HackyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
isLocked = false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (!isLocked) {
try {
return super.onInterceptTouchEvent(ev);
} catch (IllegalArgumentException e) {
e.printStackTrace();
return false;
}
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return !isLocked && super.onTouchEvent(event);
}
public void toggleLock() {
isLocked = !isLocked;
}
public void setLocked(boolean isLocked) {
this.isLocked = isLocked;
}
public boolean isLocked() {
return isLocked;
}
}ViewPagerActivity
public void onCreate(Bundle savedInstanceState) {
mViewPager.setAdapter(new SamplePagerAdapter());
if (savedInstanceState != null) {
boolean isLocked = savedInstanceState.getBoolean(ISLOCKED_ARG, false);
((HackyViewPager) mViewPager).setLocked(isLocked);
}
}PhotoView的好處是自身便支持各種觸摸事件了，而其他ImageView則需要調用才行。
protected void onSaveInstanceState(Bundle outState) {
if (isViewPagerActive()) {
outState.putBoolean(ISLOCKED_ARG, ((HackyViewPager) mViewPager).isLocked());
}
super.onSaveInstanceState(outState);
}5 RotationSampleActivity
各種旋轉角度的處理
@Override
protected void onPause() {
super.onPause();
// Remove any pending posts of callbacks and sent messages whose obj is token. If token is null, all callbacks and messages will be removed.
handler.removeCallbacksAndMessages(null);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(Menu.NONE, 0, Menu.NONE, "Rotate 10° Right");
menu.add(Menu.NONE, 2, Menu.NONE, "Toggle automatic rotation");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 0:
photo.setRotationBy(10);
return true;
case 2:
toggleRotation();
return true;
}
return super.onOptionsItemSelected(item);
}
private void toggleRotation() {
if (rotating) {
handler.removeCallbacksAndMessages(null); // 停止旋轉
} else {
rotateLoop();
}
rotating = !rotating;
}
// 自動旋轉
private void rotateLoop() {
handler.postDelayed(new Runnable() {
@Override
public void run() {
photo.setRotationBy(1);
rotateLoop();
}
}, 15);
}
6 AUILSampleActivity
使用UIL框架加載網絡圖片，universalimageloader
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_simple);
PhotoView photoView = (PhotoView) findViewById(R.id.iv_photo);
if (!ImageLoader.getInstance().isInited()) {
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()).build();
ImageLoader.getInstance().init(config);
}
ImageLoader.getInstance().displayImage("http://pbs.twimg.com/media/Bist9mvIYAAeAyQ.jpg", photoView);
}7 結尾
寫了三篇，總算是將源碼涉及到的所有知識點梳理完了，感謝閱讀。
