Learning Android custom View (3)

MainActivity is as follows:

Package cc. testviewstudy3; import android. OS. bundle; import android. view. view; import android. view. view. onClickListener; import android. app. activity;/*** Demo Description: * learning about custom View (3) ** there are three methods to implement custom View: * Self-painted controls, composite controls, and inheritance controls * In this Demo, You can implement self-painted controls and composite controls ** learning materials: * http://blog.csdn.net/guolin_blog/article/details/17357967 * Thank you very much **/public class MainActivity extends Activity {private TitleViewFrameLayout mTitleViewFrameLayout; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); init ();} private void init () {mTitleViewFrameLayout = (TitleViewFrameLayout) findViewById (R. id. titleViewFrameLayout); mTitleViewFrameLayout. setBackButtonText ("return"); mTitleViewFrameLayout. setTitleTextViewText ("title"); mTitleViewFrameLayout. setButtonClickListener (new OnClickListener () {@ Overridepublic void onClick (View v) {System. out. println ("Click Back"); finish ();}});}}

CounterView:

Package cc. testviewstudy3; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. graphics. rect; import android. util. attributeSet; import android. view. view; // The self-painted control public class CounterView extends View implements View. onClickListener {private Paint mPaint; private Rect mRect; private Rect mTextBoundsRect; private int counter = 0; public CounterView (Context context) {super (context);} public CounterView (Context context, attributeSet attrs) {super (context, attrs); mPaint = new Paint (Paint. ANTI_ALIAS_FLAG); mRect = new Rect (); mTextBoundsRect = new Rect (); // set the listener to setOnClickListener (this);} @ Overrideprotected void onDraw (Canvas canvas) {super. onDraw (canvas); mPaint. setColor (Color. YELLOW); // getWidth () and getHeight () indicate the width and height of the custom View canvas. drawRect (0, 0, getWidth (), getHeight (), mPaint); mPaint. setColor (Color. BLUE); mPaint. setTextSize (40); String counterString = String. valueOf (counter); // measure the width and height of the text. Save the result to a Rect. mTextBoundsRectmPaint. getTextBounds (counterString, 0, counterString. length (), mTextBoundsRect); float textBoundWidth = mTextBoundsRect. width (); float textBoundHeight = mTextBoundsRect. height (); // System. out. println ("textBoundWidth =" + textBoundWidth + ", textBoundHeight =" + textBoundHeight); // draw a text canvas. drawText (counterString, getWidth ()/2-textBoundWidth/2, getHeight ()/2 + textBoundHeight/2, mPaint);} @ Overridepublic void onClick (View v) {counter ++; // redraw. the onDraw () method invalidate () ;}} will be called ();}}

TitleViewFrameLayout is as follows:

Package cc. testviewstudy3; import android. content. context; import android. util. attributeSet; import android. view. layoutInflater; import android. widget. button; import android. widget. frameLayout; import android. widget. textView; // composite control public class TitleViewFrameLayout extends FrameLayout {private Button mBackButton; private TextView mTitleTextView; public attributes (Context context, AttributeSet attrs) {super (context, attrs); LayoutInflater. from (context ). inflate (R. layout. test_title, this); mBackButton = (Button) findViewById (R. id. backButton); mTitleTextView = (TextView) findViewById (R. id. titleTextView);} // definition method ---> set the public void setBackButtonText (String text) {mBackButton. setText (text) ;}// define method ---> set the Button click listener public void setButtonClickListener (OnClickListener listener) {mBackButton. setOnClickListener (listener);} // definition method ---> set the TextView text public void setTitleTextViewText (String text) {mTitleTextView. setText (text );}}

Main. xml is as follows:

Test_title:

Zookeeper