Android鍏ラ棬绡囦竴锛欰ndroid Activity鐢熷懡鍛ㄦ湡
Android api涓墍鎻愪緵鐨凙ctivity鐢熷懡鍛ㄦ湡鍥惧涓嬶細
Activity鍏跺疄鏄户鎵夸簡ApplicationContext杩欎釜绫伙紝鎴戜滑鍙互閲嶅啓浠ヤ笅鏂规硶锛屽涓嬩唬鐮?
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public class Activity extends ApplicationContext {
protected void onCreate(Bundle savedInstanceState);
protected void onStart();
protected void onRestart();
protected void onResume();
protected void onPause();
protected void onStop();
protected void onDestroy();
}
銆€銆€涓轰簡渚夸簬澶у鏇村ソ鐨勭悊瑙ｏ紝鎴戠畝鍗曠殑鍐欎簡涓€涓狣emo,涓嶆槑鐧紸ctivity鍛ㄦ湡鐨勬湅鍙嬩滑锛屽彲浠ヤ翰鎵嬪疄璺典竴涓嬶紝澶у鎸夌収鎴戠殑姝ラ鏉ャ€?/p>
銆€銆€绗竴姝?鏂板缓涓€涓狝ndroid宸ョ▼锛屾垜杩欓噷鍛藉悕涓篈ctivityDemo.
銆€銆€绗簩姝?淇敼ActivityDemo.java(鎴戣繖閲岄噸鏂板啓浜嗕互涓婄殑涓冪鏂规硶锛屼富瑕佺敤Log鎵撳嵃),浠ｇ爜濡備笅:
package com.tutor.activitydemo;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class ActivityDemo extends Activity {
private static final String TAG = " ActivityDemo " ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.e(TAG, " start onCreate~~~ " );
}
@Override
protected void onStart() {
super.onStart();
Log.e(TAG, " start onStart~~~ " );
}
@Override
protected void onRestart() {
super.onRestart();
Log.e(TAG, " start onRestart~~~ " );
}
@Override
protected void onResume() {
super.onResume();
Log.e(TAG, " start onResume~~~ " );
}
@Override
protected void onPause() {
super.onPause();
Log.e(TAG, " start onPause~~~ " );
}
@Override
protected void onStop() {
super.onStop();
Log.e(TAG, " start onStop~~~ " );
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.e(TAG, " start onDestroy~~~ " );
}
}
銆€銆€绗笁姝?杩愯涓婅堪宸ョ▼,鏁堟灉鍥惧涓?娌′粈涔堢壒鍒殑):
鏍稿績鍦↙ogcat瑙嗙獥閲?濡傛灉浣犺繕涓嶄細鐢↙ogcat浣犲彲浠ョ湅涓€涓嬫垜鐨勮繖绡囨枃绔?/span>Log鍥炬枃璇﹁В(Log.v,Log.d,Log.i,Log.w,Log.e)锛屾垜浠墦寮€搴旂敤鏃跺厛鍚庢墽琛屼簡onCreate()->onStart()->onResume涓変釜鏂规硶锛岀湅涓€涓婰ogCat瑙嗙獥濡備笅:
BACK閿細
銆€銆€褰撴垜浠寜BACK閿椂锛屾垜浠繖涓簲鐢ㄧ▼搴忓皢缁撴潫锛岃繖鏃跺€欐垜浠皢鍏堝悗璋冪敤onPause()->onStop()->onDestory()涓変釜鏂规硶锛屽涓嬪浘鎵€绀?
鑰屽綋鎴戜滑鍐嶆鍚姩ActivityDemo搴旂敤绋嬪簭鏃讹紝鍒欏厛鍚庡垎鍒墽琛屼簡onCreate()->onStart()->onResume()涓変釜鏂规硶锛岀浉褰撲簬绗竴娆℃墦寮€銆?/span>
HOME閿?
銆€銆€褰撴垜浠墦寮€搴旂敤绋嬪簭鏃讹紝姣斿娴忚鍣紝鎴戞鍦ㄦ祻瑙圢BA鏂伴椈锛岀湅鍒颁竴鍗婃椂锛屾垜绐佺劧鎯冲惉姝岋紝杩欐椂鍊欐垜浠細閫夋嫨鎸塇OME閿紝鐒跺悗鍘绘墦寮€闊充箰搴旂敤绋嬪簭锛岃€屽綋鎴戜滑鎸塇OME鐨勬椂鍊欙紝Activity鍏堝悗鎵ц浜唎nPause()->onStop()杩欎袱涓柟娉曪紝杩欐椂鍊欏簲鐢ㄧ▼搴忓苟娌℃湁閿€姣併€傚涓嬪浘鎵€绀?
鑰屽綋鎴戜滑鍐嶆鍚姩ActivityDemo搴旂敤绋嬪簭鏃讹紝鍒欏厛鍚庡垎鍒墽琛屼簡onRestart()->onStart()->onResume()涓変釜鏂规硶锛屽涓嬪浘鎵€绀?
杩欓噷鎴戜滑浼氬紩鍑轰竴涓棶棰橈紝褰撴垜浠寜HOME閿紝鐒跺悗鍐嶈繘鍏ctivityDemo搴旂敤鏃讹紝鎴戜滑鐨勫簲鐢ㄧ殑鐘舵€佸簲璇ユ槸鍜屾寜HOME閿箣鍓嶇殑鐘舵€佹槸涓€鏍风殑锛屽悓鏍蜂负浜嗘柟渚跨悊瑙ｏ紝鍦ㄨ繖閲屾垜灏咥ctivityDemo鐨勪唬鐮佷綔涓€浜涗慨鏀癸紝灏辨槸澧炲姞涓€涓狤ditText銆?/p>
銆€銆€绗洓姝?淇敼main.xml甯冨眬鏂囦欢锛堝鍔犱簡涓€涓狤ditText),浠ｇ爜濡備笅:
<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< TextView
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:text ="@string/hello"
/>
< EditText
android:id ="@+id/editText"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
/>
</ LinearLayout >
銆€銆€绗簲姝?鐒跺悗鍏朵粬涓嶅彉锛岃繍琛孉ctivityDemo绋嬪簭,鍦‥ditText閲岃緭鍏ュ"Frankie"瀛楃涓?濡備笅鍥?)
杩欐椂鍊欙紝澶у鍙互鎸変竴涓婬OME閿紝鐒跺悗鍐嶆鍚姩ActivityDemo搴旂敤绋嬪簭锛?/span>
杩欐椂鍊橢ditText閲屽苟娌℃湁鎴戜滑杈撳叆鐨?Frankie"瀛楁牱锛屽涓嬪浘:
杩欐樉鐒朵笉鑳界О寰椾竴涓悎鏍肩殑搴旂敤绋嬪簭锛屾墍浠ユ垜浠渶瑕佸湪Activity鍑犱釜鏂规硶閲岃嚜宸卞疄鐜帮紝濡備笅绗叚姝ユ墍绀?
銆€銆€绗叚姝ヤ慨鏀笰ctivityDemo.java浠ｇ爜濡備笅:
package com.tutor.activitydemo;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
public class ActivityDemo extends Activity {
private static final String TAG = " ActivityDemo " ;
private EditText mEditText;
// 瀹氫箟涓€涓猄tring 绫诲瀷鐢ㄦ潵瀛樺彇鎴戜滑EditText杈撳叆鐨勫€?
private String mString;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mEditText = (EditText)findViewById(R.id.editText);
Log.e(TAG, " start onCreate~~~ " );
}
@Override
protected void onStart() {
super.onStart();
Log.e(TAG, " start onStart~~~ " );
}
// 褰撴寜HOME閿椂锛岀劧鍚庡啀娆″惎鍔ㄥ簲鐢ㄦ椂锛屾垜浠鎭㈠鍏堝墠鐘舵€?
@Override
protected void onRestart() {
super.onRestart();
mEditText.setText(mString);
Log.e(TAG, " start onRestart~~~ " );
}
@Override
protected void onResume() {
super.onResume();
Log.e(TAG, " start onResume~~~ " );
}
// 褰撴垜浠寜HOME閿椂锛屾垜鍦╫nPause鏂规硶閲岋紝灏嗚緭鍏ョ殑鍊艰祴缁檓String
@Override
protected void onPause() {
super.onPause();
mString = mEditText.getText().toString();
Log.e(TAG, " start onPause~~~ " );
}
@Override
protected void onStop() {
super.onStop();
Log.e(TAG, " start onStop~~~ " );
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.e(TAG, " start onDestroy~~~ " );
}
}
銆€銆€绗竷姝?閲嶆柊杩愯ActivityDemo绋嬪簭锛岄噸澶嶇浜旀鎿嶄綔锛屽綋鎴戜滑鎸塇OME閿椂锛屽啀娆″惎鍔ㄥ簲鐢ㄧ▼搴忔椂锛孍ditText閲屾湁涓婃杈撳叆鐨?Frankie"瀛楁牱锛屽涓嬪浘濡傜ず:
OK,澶у姛鍩烘湰鍛婃垚锛岃繖鏃跺€欏ぇ瀹跺彲浠ュ湪鍥炰笂闈㈢湅涓€涓婣ctivity鐢熷懡鍛ㄦ湡鍥撅紝鎴戞兂澶у搴旇瀹屽叏浜嗚В浜咥ctivity鐨勭敓鍛藉懆鏈熶簡锛屼笉鐭ラ亾浣犱簡瑙ｄ簡娌★紵
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