android 锁屏的生命周期_Activity的生命周期的七个场景
簡單介紹Activity生命周期經常調用的幾個方法：
onCreate()與onDestroy()
Activity的創建與銷毀，處于Activity的entire lifetime完整生命周期
onStart()與onStop()
Activity的可見與不可見，處于Activity的visible lifetime可見生命周期
onResume()與onPause()
Activity的獲取焦點與失去焦點,處于Activity的foreground time 前臺生命周期
onSaveInstanceState()與onRestoreIntanceState()
保存數據和取出保存的數據，橫豎屏切換的時候，兩個方法會被同時調用，當然這只是這兩個方法同時出現場景之一
onConfiguration()
在Activity的Manifest文件下配置完configChanges屬性,如果是橫豎屏切換相關值，則在橫豎屏切換時會被調用
下面用Activity的使用的七個場景來這些生命周期方法的執行順序
一、Activity1首次啟動
onCreate-->onStart-->onResume
控制臺打印效果圖
Activity首次啟動生命周期調用順序.png
二、Activity1按返回鍵并從手機緩存應用列表中啟動
onResume-->onPause-->onStop-->onDestroy
再次啟動：onCreate-->onStart-->onResume
控制臺打印效果圖
Activity從手機緩存啟動.jpg
三、Activity1按住home鍵從手機緩存應用列表中再次啟動
onResume-->onPause-->onSaveInstanceState-->onStop
再次啟動:onRestart-->onStart-->onResume
控制臺打印效果圖
Home鍵再從手機緩存啟動.jpg
四、Activity1鎖屏關閉再開啟
onResume-->onPause-->onSaveInstanceState-->onStop
再次啟動:onRestart-->onStart-->onResume
控制臺打印效果圖
鎖屏關閉.jpg
五、Activity1啟動Activity2
Activity1:onResume-->onPause
Activity2:onCreate-->onStart-->onResume
Activity1:onSaveInstanceState-->onStop
控制臺打印效果圖
Activity1啟動Activity2.jpg
六、Activity1啟動Activity2,Activity2退出或者按返回鍵
Activity2:onResume-->onPause
Activity1:onRestart-->onStart-->onResume
Activity2:onStop-->onDestroy
控制臺打印效果圖
Activity2被關閉.jpg
七、Activity1橫縱屏切換，并做相關配置
豎屏：onCreate-->onStart-->onResume-->onPause-->onSaveInstanceState
-->onStop-->onDestroy
橫屏：onCreate-->onStart-->onRestoreInstanceState-->onResume
控制臺打印效果圖
橫縱屏切換.jpg
配置Activity橫豎切換不重新創建
android:configChanges="orientation|screenSize"
是在AndroidManifest.xml相應的標簽的屬性
控制臺打印效果圖
配置ActivityconfigChanges后生命周期.jpg
Activity1代碼塊
public class MainActivity extends AppCompatActivity {
static String TAG="dayng";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState!=null){
Log.i(TAG,"退出時保存的數據"+savedInstanceState.getString("dayang"));
}
Log.i(TAG,"-------MainActivity.onCreate--------");
}
public void onClick(View view){
Intent intent=new Intent(this,Main2Activity.class);
startActivity(intent);
}
@Override
protected void onStart() {
super.onStart();
Log.i(TAG,"-------MainActivity.onStart--------");
}
@Override
protected void onResume() {
super.onResume();
Log.i(TAG,"-------MainActivity.onResume--------");
}
@Override
protected void onPause() {
super.onPause();
Log.i(TAG,"-------MainActivity.onPause--------");
}
@Override
protected void onRestart() {
super.onRestart();
Log.i(TAG,"-------MainActivity.onRestart--------");
}
@Override
protected void onStop() {
super.onStop();
Log.i(TAG,"-------MainActivity.onStop--------");
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.i(TAG,"-------MainActivity.onDestroy--------");
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putString("dayang","-----7777777");
super.onSaveInstanceState(outState);
Log.i(TAG,"--------MainActivity.onSaveInstanceState--------");
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.i(TAG,"--------MainActivity.onRestoreInstanceState--------");
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.i(TAG,"--------MainActivity.onConfiguration--------");
}
}
Activity2代碼塊
public class Main2Activity extends AppCompatActivity {
static String TAG="dayang";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Log.i(TAG,"-------Main2Activity.onCreate-------");
}
@Override
protected void onStart() {
super.onStart();
Log.i(TAG,"-------Main2Activity.onStart-------");
}
@Override
protected void onResume() {
super.onResume();
Log.i(TAG,"-------Main2Activity.onResume-------");
}
@Override
protected void onPause() {
super.onPause();
Log.i(TAG,"-------Main2Activity.onPause-------");
}
@Override
protected void onStop() {
super.onStop();
Log.i(TAG,"-------Main2Activity.onStop-------");
}
@Override
protected void onRestart() {
super.onRestart();
Log.i(TAG,"-------Main2Activity.onRestart-------");
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.i(TAG,"-------Main2Activity.onDestroy-------");
}
public void close(View view){
finish();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.i(TAG,"-------Main2Activity.onSaveInstanceState-------");
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
Log.i(TAG,"-------Main2Activity.onRestoreInstanceState-------");
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.i(TAG,"-------Main2Activity.onConfiguration-------");
}
}
總結
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