Android uses TimerTask to implement ImageView image playback,

Android uses TimerTask to implement ImageView image playback,

In project development, image playback is often used. Today, TimerTask and ImageView are used to achieve simple image playback.

TimerTask and Timer are used in combination to process events in time periods such as iteration latency of TimerTask.

The specific example is as follows:

1. layout xml Code

<Span style = "font-family: Microsoft YaHei; font-size: 18px;"> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: layout_width = "match_parent" android: layout_height = "match_parent" android: gravity = "center_horizontal" android: orientation = "vertical"> <! -- Start playing --> <Button android: id = "@ + id/my_start_btn" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "Start"/> <! -- Stop playing --> <Button android: id = "@ + id/my_stop_btn" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "Stop"/> <! -- Start playing again --> <Button android: id = "@ + id/my_restart_btn" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: text = "Restart"/> <ImageView android: id = "@ + id/image_iv" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: src = "@ drawable/onea"/> </LinearLayout> </span>

2. MainActivity code

<Span style = "font-family: Microsoft YaHei; font-size: 18px;"> package com. example. myimageplaydemo; import java. util. timer; import java. util. timerTask; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. view. menu; import android. view. menuItem; import android. view. view; import android. view. view. onClickListener; import android. widget. button; imp Ort android. widget. imageView; public class MainActivity extends Activity implements OnClickListener {private Button startBtn, stopBtn, restartBtn; private ImageView imageIv; private Timer timer; private TimerTask timerTask; private int count = 0; private Handler handler = new Handler () {@ Overridepublic void handleMessage (Message msg) {int myCount = Integer. valueOf (msg. obj. toString (); switch (msg. what) {c Ase 1: setImageViewSrc (myCount); break; case 2: stopTimer (); break; case 3: setImageViewSrc (myCount); break ;}}}; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main) ;}@ Overridepublic void onStart () {super. onStart (); startBtn = (Button) this. findViewById (R. id. my_start_btn); stopBtn = (Button) this. findViewById (R. id. my_stop_btn ); RestartBtn = (Button) this. findViewById (R. id. my_restart_btn); imageIv = (ImageView) this. findViewById (R. id. image_iv); startBtn. setOnClickListener (this); stopBtn. setOnClickListener (this); restartBtn. setOnClickListener (this) ;}@ Overridepublic void onStop () {super. onStop (); stopTimer () ;}@ Overridepublic void onClick (View v) {// TODO Auto-generated method stubswitch (v. getId () {case R. id. my_start_btn: if (ti MerTask = null) {timer = new Timer (); // set the image timerTask = new TimerTask () {@ Overridepublic void run () {++ count for one second of iteration; handler. sendMessage (handler. obtainMessage (1, count) ;}}; timer. schedule (timerTask, 1000,100 0);} else {handler. sendMessage (handler. obtainMessage (1, count);} break; case R. id. my_stop_btn: handler. sendMessage (handler. obtainMessage (2, count); break; case R. id. my_restart_btn: if (timerTask = Null) {count = 0; timer = new Timer (); timerTask = new TimerTask () {@ Overridepublic void run () {count ++; handler. sendMessage (handler. obtainMessage (3, count) ;}}; timer. schedule (timerTask, 1000,100 0);} else {handler. sendMessage (handler. obtainMessage (3, 0) ;}}/ *** sets the image * @ param count */private void setImageViewSrc (int count) based on the count Loop) {int myCount = count % 7; switch (myCount) {case 0: ima GeIv. setImageResource (R. drawable. onea); break; case 1: imageIv. setImageResource (R. drawable. oneb); break; case 2: imageIv. setImageResource (R. drawable. onec); break; case 3: imageIv. setImageResource (R. drawable. oned); break; case 4: imageIv. setImageResource (R. drawable. onee); break; case 5: imageIv. setImageResource (R. drawable. onef); break; case 6: imageIv. setImageResource (R. drawable. oneg); break;}/*** destroy TimerTask and Timer */Private void stopTimer () {if (timerTask! = Null) {timerTask. cancel (); timerTask = null;} if (timer! = Null) {timer. cancel (); timer = null ;}}</span>

Where

<Span style = "font-family: Microsoft YaHei; font-size: 18px;"> <span style = "white-space: pre "> </span> if (timerTask = null) {timer = new Timer (); // sets the image timerTask = new TimerTask () for one second after iteration () {@ Overridepublic void run () {++ count; handler. sendMessage (handler. obtainMessage (1, count) ;}}; timer. schedule (timerTask, 1000,100 0);} else {handler. sendMessage (handler. obtainMessage (1, count) ;}</span>

After timerTask is delayed for one second, different images are set every second to play cyclically Based on count.

Source Code address: http://download.csdn.net/detail/a123demi/7736643