android SDK 开发范例大全（第2版）3-2

package irdc.ex07_03; import java.util.Date; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.os.Handler; import android.util.DisplayMetrics; import android.util.Log; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; public class EX07_03 extends Activity { private TextView mTextView01; private ImageView mImageView01; /* LayoutInflater对象作为新建AlertDialog之用 */ private LayoutInflater mInflater01; /* 输入解锁的View */ private View mView01; private EditText mEditText01,mEditText02; /* menu选项identifier，用以标识事件 */ static final private int MENU_ABOUT = Menu.FIRST; static final private int MENU_EXIT = Menu.FIRST+1; private Handler mHandler01 = new Handler(); private Handler mHandler02 = new Handler(); private Handler mHandler03 = new Handler(); private Handler mHandler04 = new Handler(); /* 控制User静止与?的Counter */ private int intCounter1, intCounter2; /* 控制FadeIn与Fade Out的Counter */ private int intCounter3, intCounter4; /* 控制循序替换背景图ID的Counter */ private int intDrawable=0; /* 上一次User有操作的Time Stamp */ private Date lastUpdateTime; /* 计算User共几秒没有操作 */ private long timePeriod; /* 静止超过n秒将自动进入屏幕保护 */ private float fHoldStillSecond = (float) 5; private boolean bIfRunScreenSaver; private boolean bFadeFlagOut, bFadeFlagIn = false; private long intervalScreenSaver = 1000; private long intervalKeypadeSaver = 1000; private long intervalFade = 100; private int screenWidth, screenHeight; /* 每n秒置换图片 */ private int intSecondsToChange = 5; /* 设定Screen Saver需要用到的背景图 */ private static int[] screenDrawable = new int[] { R.drawable.screen1, R.drawable.screen2, R.drawable.screen3, R.drawable.screen4, R.drawable.screen5 }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* 必须?setContentView之前调用回屏幕显示 */ requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags ( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN ); setContentView(R.layout.main); /* onCreate all Widget */ mTextView01 = (TextView)findViewById(R.id.myTextView1); mImageView01 = (ImageView)findViewById(R.id.myImageView1); mEditText01 = (EditText)findViewById(R.id.myEditText1); /* 初始取得User触碰手机的时间 */ lastUpdateTime = new Date(System.currentTimeMillis()); /* 初始化Layout上的Widget?见性 */ recoverOriginalLayout(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub /* menu群组ID */ int idGroup1 = 0; /* The order position of the item */ int orderMenuItem1 = Menu.NONE; int orderMenuItem2 = Menu.NONE+1; /* 建立具有SubMenu的menu */ menu.add(idGroup1, MENU_ABOUT, orderMenuItem1, R.string.app_about); /* 建立离开 */ menu.add(idGroup1, MENU_EXIT, orderMenuItem2, R.string.str_exit); menu.setGroupCheckable(idGroup1, true, true); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch(item.getItemId()) { case (MENU_ABOUT): new AlertDialog.Builder ( EX07_03.this ).setTitle(R.string.app_about).setIcon ( R.drawable.hippo ).setMessage ( R.string.app_about_msg ).setPositiveButton(R.string.str_ok, new DialogInterface.OnClickListener() { public void onClick (DialogInterface dialoginterface, int i) { } }).show(); break; case (MENU_EXIT): /* 离开程序 */ finish(); break; } return super.onOptionsItemSelected(item); } /* 监控User没有操作的线程 */ private Runnable mTasks01 = new Runnable() { public void run() { intCounter1++; Date timeNow = new Date(System.currentTimeMillis()); /* 计算User静止不动的时间间距 */ timePeriod = (long)timeNow.getTime() - (long)lastUpdateTime.getTime(); float timePeriodSecond = ((float)timePeriod/1000); /* 如果超过时间静止不动 */ if(timePeriodSecond>fHoldStillSecond) { /* 静止超过时间第几次的标记 */ if(bIfRunScreenSaver==false) { /* 启动线程2 */ mHandler02.postDelayed(mTasks02, intervalScreenSaver); /* Fade Out*/ if(intCounter1%(intSecondsToChange)==0) { bFadeFlagOut=true; mHandler03.postDelayed(mTasks03, intervalFade); } else { /* 在Fade Out后立即Fade In */ if(bFadeFlagOut==true) { bFadeFlagIn=true; mHandler04.postDelayed(mTasks04, intervalFade); } else { bFadeFlagIn=false; intCounter4 = 0; mHandler04.removeCallbacks(mTasks04); } intCounter3 = 0; bFadeFlagOut = false; } bIfRunScreenSaver = true; } else { /* screen saver 正在运行中 */ /* Fade Out*/ if(intCounter1%(intSecondsToChange)==0) { bFadeFlagOut=true; mHandler03.postDelayed(mTasks03, intervalFade); } else { /* 在Fade Out后立即Fade In */ if(bFadeFlagOut==true) { bFadeFlagIn=true; mHandler04.postDelayed(mTasks04, intervalFade); } else { bFadeFlagIn=false; intCounter4 = 0; mHandler04.removeCallbacks(mTasks04); } intCounter3 = 0; bFadeFlagOut=false; } } } else { /* 当User没有动的间距未超过时间 */ bIfRunScreenSaver = false; /* 恢复原来的Layout Visible*/ recoverOriginalLayout(); } /* 以LogCat监看User静止不动的时间间距 */ Log.i("HIPPO", "Counter1:"+Integer.toString(intCounter1)+"/"+Float.toString(timePeriodSecond)); /* 反复执行线程1 */ mHandler01.postDelayed(mTasks01, intervalKeypadeSaver); } }; /* Screen Saver Runnable */ private Runnable mTasks02 = new Runnable() { public void run() { if(bIfRunScreenSaver==true) { intCounter2++; hideOriginalLayout(); showScreenSaver(); //Log.i("HIPPO", "Counter2:"+Integer.toString(intCounter2)); mHandler02.postDelayed(mTasks02, intervalScreenSaver); } else { mHandler02.removeCallbacks(mTasks02); } } }; /* Fade Out特效Runnable */ private Runnable mTasks03 = new Runnable() { public void run() { if(bIfRunScreenSaver==true && bFadeFlagOut==true) { intCounter3++; /* 设定ImageView的透明度渐暗下去 */ mImageView01.setAlpha(255-intCounter3*28); Log.i("HIPPO", "Fade out:"+Integer.toString(intCounter3)); mHandler03.postDelayed(mTasks03, intervalFade); } else { mHandl