今天学习了Bitmap(位图)全解析。
主要实现代码为:
public class MainActivity extends AppCompatActivity { static ByteArrayOutputStream byteOut = null; private Bitmap bitmap = null; private Button btn_cut; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn_cut = (Button) findViewById(R.id.btn_cut); btn_cut.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { captureScreen(); } }); } public void captureScreen() { Runnable action = new Runnable() { @Override public void run() { final View contentView = getWindow().getDecorView(); try{ Log.e("HEHE",contentView.getHeight()+":"+contentView.getWidth()); bitmap = Bitmap.createBitmap(contentView.getWidth(), contentView.getHeight(), Bitmap.Config.ARGB_4444); contentView.draw(new Canvas(bitmap)); ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteOut); savePic(bitmap, "sdcard/short.png"); }catch (Exception e){e.printStackTrace();} finally { try{ if (null != byteOut) byteOut.close(); if (null != bitmap && !bitmap.isRecycled()) { // bitmap.recycle(); bitmap = null; } }catch (IOException e){e.printStackTrace();} } } }; try { action.run(); } catch (Exception e) { e.printStackTrace(); } } private void savePic(Bitmap b, String strFileName) { FileOutputStream fos = null; try { fos = new FileOutputStream(strFileName); if (null != fos) { boolean success= b.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); if(success) Toast.makeText(MainActivity.this, "截屏成功", Toast.LENGTH_SHORT).show(); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }