Android learning history UI ----- imageView: rotating and scaling Images

Android learning history UI ----- imageView: rotating and scaling Images

I feel it will be nice to write and parse in the code. I will directly use the method used for parsing in the program code.

MainActivity:

Package com. example. imageview_demo03; import android. support. v7.app. actionBarActivity; import android. util. displayMetrics; import android. annotation. suppressLint; import android. graphics. bitmap; import android. graphics. matrix; import android. graphics. drawable. bitmapDrawable; import android. OS. bundle; import android. widget. imageView; import android. widget. linearLayout; import android. widget. seekBar; import and Roid. widget. textView; import android. widget. seekBar. extends; @ SuppressLint ("NewApi") public class MainActivity extends ActionBarActivity implements extends {// the smallest scaling width is private int minWidth = 80; private ImageView imageView; private SeekBar seekBar1; private SeekBar seekBar2; private TextView textView1; private TextView textView2; // Matrix class, used to rotate the image private matrix Matrix = new Matri X (); @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); imageView = (ImageView) findViewById (R. id. imageView); seekBar1 = (SeekBar) findViewById (R. id. seekBar1); seekBar2 = (SeekBar) findViewById (R. id. seekBar2); seekBar1.setOnSeekBarChangeListener (this); seekBar2.setOnSeekBarChangeListener (this); textView1 = (TextView) findVie WById (R. id. textview1); textView2 = (TextView) findViewById (R. id. textview2); // create an empty display matrix to store the current screen information, such as the size. DisplayMetrics displayMetrics = new DisplayMetrics (); // transmits the currently managed screen size to displayMetricsgetWindowManager (). getdefadisplay display (). getMetrics (displayMetrics); // you can specify a maximum value of seekBar1.setMax (displayMetrics. widthPixels-minWidth) ;}@ Overridepublic void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser) {if (seekBar. getId () = R. id. seekBar1) {// set the width to 80 to the maximum int mwidth = progress + minWidth; int mheight = (int) (2 * mwidth/3 ); // set the imageView output size parameter // because the image is a fitcenter parameter, therefore, the image size changes with the size of the image framework. // changing the size of the image framework will change the image size, so that the image can be enlarged or reduced. setLayoutParams (new LinearLayout. layoutParams (mwidth, mheight); textView1.setText ("Image Width:" + mwidth + "\ t Image Height:" + mheight);} else if (seekBar. getId () = R. id. seekBar2) {// The setRotation method of imageView itself is to rotate clockwise around the center of the image. // The rotation does not change the output size of imageView, the part that exceeds the imageView is displayed at the bottom of the view. // imageView. setRotation (progress); // if you want to create a rotated image that does not exceed the imageView output frame, you need to take the original image out and rotate it, re-import to imageView // defect: occupying a large amount of memory, it will compare the card Bitmap bitmap = (BitmapDrawable) (getResources (). getDrawable (R. drawable. photo ))). getBitmap (); matrix. setRotate (progress); bitmap = Bitmap. createBitmap (bitmap, 0, 0, bitmap. getWidth (), bitmap. getHeight (), matrix, true); imageView. setImageBitmap (bitmap); textView2.setText ("image rotation" + progress + "degree") ;}@ Overridepublic void onStartTrackingTouch (SeekBar seekBar) {// TODO Auto-generated method stub} @ Overridepublic void onStopTrackingTouch (SeekBar seekBar) {// TODO Auto-generated method stub }}

Xml:

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