Android 開(kāi)發(fā)過(guò)程中部分 Activity 在顯示的時(shí)候就要求給用戶顯示一個(gè)進(jìn)度框來(lái)改善用戶體驗(yàn)，比如：Activity 在啟動(dòng)的時(shí)候就去聯(lián)網(wǎng)請(qǐng)求數(shù)據(jù)、讀取數(shù)據(jù)庫(kù)內(nèi)容等。進(jìn)度框顯示樣式如下，采用幀動(dòng)畫，而非 ProgressBar。幀動(dòng)畫的啟動(dòng)方式有四種，代碼分別如下：

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? 第一種方式在 Activity 啟動(dòng)時(shí)自動(dòng)運(yùn)行動(dòng)畫

package cn.sunzn.anim;import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.os.Bundle; import android.view.ViewTreeObserver.OnPreDrawListener; import android.widget.ImageView;public class AnimActivity extends Activity {/*** 動(dòng)畫控件*/private ImageView mLoading;private AnimationDrawable mLoadingAinm;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}/*** 完成初始化*/private void init() {initView();}/*** 初始化視圖*/private void initView() {mLoading = (ImageView) findViewById(R.id.loading);mLoading.setBackgroundResource(R.drawable.progressbar_activity_waiting);mLoadingAinm = (AnimationDrawable) mLoading.getBackground();mLoading.getViewTreeObserver().addOnPreDrawListener(listener);}/*** 當(dāng)一個(gè)視圖樹(shù)將要繪制時(shí)產(chǎn)生事件，可以添加一個(gè)其事件處理函數(shù)，注意結(jié)尾返回的值*/OnPreDrawListener listener = new OnPreDrawListener() {public boolean onPreDraw() {mLoadingAinm.start();return true;}};}

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? 第二種方式在 Activity 啟動(dòng)時(shí)自動(dòng)運(yùn)行動(dòng)畫

package cn.sunzn.anim;import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.os.AsyncTask; import android.os.Bundle; import android.widget.ImageView;public class AnimActivity extends Activity {/*** 動(dòng)畫控件*/private ImageView mLoading;/*** 數(shù)據(jù)加載動(dòng)畫*/private AnimationDrawable mLoadingAinm;/*** 異步類執(zhí)行啟動(dòng)動(dòng)畫*/private RunAnim runAnim;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}/*** 完成初始化*/private void init() {initView();}/*** 初始化視圖*/private void initView() {mLoading = (ImageView) findViewById(R.id.loading);mLoading.setBackgroundResource(R.drawable.progressbar_activity_waiting);mLoadingAinm = (AnimationDrawable) mLoading.getBackground();runAnim = new RunAnim();runAnim.execute("");}/*** 異步類執(zhí)行動(dòng)畫*/class RunAnim extends AsyncTask<String, String, String> {protected String doInBackground(String... params) {if (!mLoadingAinm.isRunning()) {mLoadingAinm.stop();mLoadingAinm.start();}return "";}}}

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? 第三種方式在 Activity 啟動(dòng)時(shí)自動(dòng)運(yùn)行動(dòng)畫

package cn.sunzn.anim;import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.os.Bundle; import android.widget.ImageView;public class AnimActivity extends Activity {/*** 動(dòng)畫控件*/private ImageView mLoading;/*** 數(shù)據(jù)加載動(dòng)畫*/private AnimationDrawable mLoadingAinm;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}/*** 完成初始化*/private void init() {initView();}/*** 初始化視圖*/private void initView() {mLoading = (ImageView) findViewById(R.id.loading);mLoading.setBackgroundResource(R.drawable.progressbar_activity_waiting);mLoadingAinm = (AnimationDrawable) mLoading.getBackground();mLoading.post(new Runnable() {public void run() {mLoadingAinm.start();}});}}

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?? 第四種方式在 Activity 啟動(dòng)時(shí)自動(dòng)運(yùn)行動(dòng)畫

package cn.sunzn.anim;import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.os.Bundle; import android.widget.ImageView;public class AnimActivity extends Activity {/*** 動(dòng)畫控件*/private ImageView mLoading;/*** 數(shù)據(jù)加載動(dòng)畫*/private AnimationDrawable mLoadingAinm;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}/*** 完成初始化*/private void init() {initView();}/*** 初始化視圖*/private void initView() {mLoading = (ImageView) findViewById(R.id.loading);mLoading.setBackgroundResource(R.drawable.progressbar_activity_waiting);mLoadingAinm = (AnimationDrawable) mLoading.getBackground();}/*** 窗體焦點(diǎn)改變時(shí)執(zhí)行動(dòng)畫*/public void onWindowFocusChanged(boolean hasFocus) {mLoadingAinm.start();super.onWindowFocusChanged(hasFocus);}}

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轉(zhuǎn)載于:https://www.cnblogs.com/sunzn/archive/2013/05/24/3096760.html

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