android初学者小项目

package demo.qihua.dt; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.os.Bundle; import android.os.PowerManager; import android.view.Menu; import android.view.MenuItem; import android.view.Window; import android.view.WindowManager; import android.widget.LinearLayout; import android.widget.Toast; public class DianTongActivity extends Activity { private boolean ifLocked = false; private PowerManager.WakeLock mWakeLock; private PowerManager mPowerManager; private LinearLayout mLinearLayout; static final private int M_CHOOSE = Menu.FIRST; static final private int M_EXIT = Menu.FIRST+1; private int[] color={R.drawable.white,R.drawable.blue, R.drawable.pink,R.drawable.green, R.drawable.orange,R.drawable.yellow}; private int[] text={R.string.str_white,R.string.str_blue, R.string.str_pink,R.string.str_green, R.string.str_orange,R.string.str_yellow}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags ( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN ); setContentView(R.layout.main); mLinearLayout=(LinearLayout)findViewById(R.id.myLinearLayout1); mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE); mWakeLock = mPowerManager.newWakeLock ( PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "BackLight" ); WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = 1.0f; getWindow().setAttributes(lp); } @Override public boolean onCreateOptionsMenu(Menu menu) { int idGroup1 = 0; int orderMenuItem1 = Menu.NONE; int orderMenuItem2 = Menu.NONE+1; menu.add(idGroup1,M_CHOOSE,orderMenuItem1,R.string.str_title); menu.add(idGroup1,M_EXIT,orderMenuItem2,R.string.str_exit); menu.setGroupCheckable(idGroup1, true, true); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch(item.getItemId()) { case (M_CHOOSE): new AlertDialog.Builder(DianTongActivity.this) .setTitle(getResources().getString(R.string.str_title)) .setAdapter(new MyAdapter(this,color,text),listener1) .setPositiveButton("先不选，取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { } }) .show(); break; case (M_EXIT): this.finish(); break; } return super.onOptionsItemSelected(item); } OnClickListener listener1=new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog,int which) { mLinearLayout.setBackgroundResource(color[which]); Toast.makeText(DianTongActivity.this, getResources().getString(text[which]), Toast.LENGTH_LONG).show(); } }; @Override protected void onResume() { wakeLock(); super.onResume(); } @Override protected void onPause() { wakeUnlock(); super.onPause(); } private void wakeLock() { if (!ifLocked) { ifLocked = true; mWakeLock.acquire(); } } private void wakeUnlock() { if (ifLocked) { mWakeLock.release(); ifLocked = false; } } }