安卓开发实验报告

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1、 . . 安卓开发实验报告目录一、 页面跳转二、 长按图标抖动以与显示删除一、 页面跳转功能：通过点击button实现2个activity之间的跳转。1.设置监听器监听点击button2.使用intent传输数据完整代码1.ui_test.javapublicclass UI_Test extends Activity Overrideprotectedvoid onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.incident_activity_1);

2、 Button bt = (Button)findViewById(R.id.login); bt.setOnClickListener(new OnClickListener(); class OnClickListener implements View.OnClickListenerpublicvoid onClick(View v) EditText name = (EditText)findViewById(R.id.name); EditText password = (EditText)findViewById(R.id.password); Bundle data=new Bu

3、ndle(); data.putString(name, name.getText().toString(); data.putString(password, password.getText().toString(); Intent intent = new Intent(UI_Test.this,UI_Result.class); intent.putExtras(data); startActivity(intent); 2.ui_result.javapublicclass UI_Result extends Activity Overrideprotectedvoid onCrea

4、te(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.incident_activity_2); TextView name = (TextView)findViewById(R.id.nameShow); TextView password = (TextView)findViewById(R.id.passwordShow); Intent intent=getIntent(); Bundle result = intent.getExtras(); name.se

5、tText(您的用户名为： +result.getString(name); password.setText(您的密码为： +result.getString(password); 3.activity_1.xml4.activity_2.xml二、 长按图标抖动以与显示删除功能：将app列举在界面上，并且长按图标使图标进行抖动以与显示删除图标。1. 初始化一个gridview的适配器2. 通过不停转动图标实现图标的抖动以与添加删除图标3. 添加监听器实现长按图标使图标抖动与显示删除完整代码1. main_activity.javapublicclass MainActivity exten

6、ds Activity private PackageManager mPackageManager;private GridView mAppGrid;private List mAppList;private Drawable mColorDrawable;private GridViewAdapter mAdapter = null;privatestaticintmAppState = 0; privatestaticfinalintAPP_DELFINISHED = 0x1;public MainActivity() / TODO Auto-generated constructor

7、 stubOverridepublicboolean onKeyDown(int keyCode, KeyEvent event) if (keyCode = KeyEvent.KEYCODE_BACK & event.getRepeatCount() = 0)if(mAppState = 1)/resetAllAppIcon();refreshAppList();returntrue;returnsuper.onKeyDown(keyCode, event);Overrideprotectedvoid onCreate(Bundle savedInstanceState) / TODO Au

8、to-generated method stubsuper.onCreate(savedInstanceState);mAppList = new ArrayList();getAppList(mAppList);setContentView(R.layout.activity_main);mAppGrid = (GridView) findViewById(R.id.app_list_grid);mAppGrid.setNumColumns (calculatorNumColumn();mAdapter = new GridViewAdapter(mAppList,this,mPackage

9、Manager);mAppGrid.setAdapter(mAdapter);mAppGrid.setOnItemClickListener(clickListener);mAppGrid.setOnItemLongClickListener(itemLongClickListener); /mAppGrid.setOnTouchListener(new PicOnTouchListener();Overrideprotectedvoid onResume() / TODO Auto-generated method stubsuper.onResume();Overrideprotected

10、void onPause() / TODO Auto-generated method stubsuper.onPause();Overrideprotectedvoid onDestroy() / TODO Auto-generated method stubsuper.onDestroy();OnItemClickListener clickListener = new OnItemClickListener() Overridepublicvoid onItemClick(AdapterView parent, View view, int position,long id) if(mA

11、ppState = 1)PackageInfo info = mAppList.get(position);/ActivityUri packageURI = Uri.parse(package: + info.applicationInfo.packageName);Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);startActivityForResult(uninstallIntent,APP_DELFINISHED); ; Overrideprotectedvoid onActivityResu

12、lt(int requestCode, int resultCode, Intent data) / TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);OnItemLongClickListener itemLongClickListener = new OnItemLongClickListener()Overridepublicboolean onItemLongClick(AdapterView arg0, View arg1, int arg2, long arg3)

13、 / TODO Auto-generated method stub animAllAppIcon();returntrue; ;privatevoid getAppList(List list)mPackageManager = getPackageManager();List packs = mPackageManager.getInstalledPackages(0);if(packs != null & packs.size() 0)for(PackageInfo info: packs)if(info.applicationInfo.flags & ApplicationInfo.F

14、LAG_SYSTEM) = 0 &(info.applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)=0)list.add(info);privatevoid refreshAppList()mAppList.clear();getAppList(mAppList);mAdapter.setData(mAppList);mAdapter.notifyDataSetChanged();mAppState = 0;privatevoid animAllAppIcon()int nCount = mAppGrid.getChi

15、ldCount();mColorDrawable = mAppGrid.getSelector();mAppGrid.setSelector(new ColorDrawable(Color.TRANSPARENT);for(int i = 0 ;i nCount; i +)View v = mAppGrid.getChildAt(i);RelativeLayout layout;Animation shake;/if(i % 2 = 0)shake = AnimationUtils.loadAnimation(MainActivity.this, R.anim.icon_anim_left);

16、shake.reset();shake.setFillAfter(true);/else/shake = AnimationUtils.loadAnimation(/MainActivity.this, R.anim.icon_anim_right);/shake.reset();/shake.setFillAfter(true);/v.startAnimation(shake);layout = (RelativeLayout)v.findViewById(R.id.view_delete);layout.setVisibility(View.VISIBLE);mAppState = 1;p

17、rivatevoidresetAllAppIcon()int nCount = mAppGrid.getChildCount();mAppGrid.setSelector(mColorDrawable);for(int i = 0 ;i nCount; i +)View v = mAppGrid.getChildAt(i);RelativeLayout layout;v.clearAnimation();layout = (RelativeLayout)v.findViewById(R.id.view_delete);layout.setVisibility(View.INVISIBLE);m

18、AppState = 0;privateint calculatorNumColumn()int nCol = 5;android.view.Display display = getWindowManager().getDefaultDisplay(); int widthPIX = display.getWidth(); finalfloat scale = getResources().getDisplayMetrics().density;nCol = (int)(widthPIX/scale/80);return nCol;/*private class PicOnTouchList

19、ener implements OnTouchListener Override public boolean onTouch(View v, MotionEvent event) if(mAppState = 1) resetAllAppIcon(); return true; */2. GridViewAdapterpublicclass GridViewAdapter extends BaseAdapter List mAppList = null;PackageManager mPackageManager = null;View mView = null;Context mConte

20、xt = null;public GridViewAdapter(List list, Context context,PackageManager manager) mAppList = list;mContext = context;mPackageManager = manager;Overridepublicint getCount() returnmAppList.size();Overridepublic Object getItem(int position) returnmAppList.get(position);Overridepubliclong getItemId(in

21、t position) return position;Overridepublic View getView(int position, View convertView, ViewGroup parent) ImageView i;TextView t;if (convertView = null) convertView = LayoutInflater.from(mContext).inflate(R.layout.app_list_item, null);i = (ImageView) convertView.findViewById(R.id.img_appicon);t = (T

22、extView) convertView.findViewById(R.id.txt_appname);i.setScaleType(ImageView.ScaleType.FIT_CENTER);PackageInfo info = mAppList.get(position);i.setImageDrawable(info.applicationInfo.loadIcon(mPackageManager);t.setText(info.applicationInfo.loadLabel(mPackageManager);return convertView;publicvoid setData(List list)mAppList = list;3. activity_main.xml4. app_list_item.xml 13 / 13