系出名門Android(8) - 控件(View)之TextSwitcher, Gallery...

時間 2019-12-09

標籤系出名門 android 控件 view textswitcher gallery 欄目 Android 简体版

原文原文鏈接

系出名門Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView,

ExpandableList java

做者：webabcd 介紹在 Android 中使用各類控件(View) TextSwitcher - 文字轉換器控件（改變文字時增長⼀些動畫效果） Gallery - 縮略圖瀏覽器控件 ImageSwitcher - 圖片轉換器控件（改變圖片時增長⼀些動畫效果） GridView - 網格控件 ListView - 列表控件 ExpandableList - 支持展開/收縮功能的列表控件一、TextSwitcher 的 Demo textswitcher.xml 代碼 <?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"> <Button android:id="@+id/btnChange" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="改變文字" />  <TextSwitcher android:id="@+id/textSwitcher" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _TextSwitcher.java 代碼 package com.webabcd.view; import java.util.Random; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.Button; import android.widget.TextSwitcher; import android.widget.TextView; import android.widget.ViewSwitcher; public class _TextSwitcher extends Activity implements ViewSwitcher.ViewFactory { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.textswithcer); setTitle("TextSwithcer"); final TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher); // 指定轉換器的 ViewSwitcher.ViewFactory switcher.setFactory(this); // 設置淡入和淡出的動畫效果 Animation in = AnimationUtils.loadAnimation(this, android.R.anim.fade_in); Animation out = AnimationUtils.loadAnimation(this, android.R.anim.fade_out); switcher.setInAnimation(in); switcher.setOutAnimation(out); // 單擊⼀次按鈕改變⼀次文字 Button btnChange = (Button) this.findViewById(R.id.btnChange); btnChange.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { switcher.setText(String.valueOf(new Random().nextInt())); } }); } // 重寫 ViewSwitcher.ViewFactory 的 makeView()，返回⼀個 View @Override public View makeView() { TextView textView = new TextView(this); textView.setTextSize(36); return textView; } } 二、Gallery 的 Demo gallery.xml 代碼 <?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">  <Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="wrap_content" android:spacing="20px" /> </LinearLayout> _Gallery.java 代碼 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.Toast; import android.widget.Gallery.LayoutParams; public class _Gallery extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.gallery); setTitle("Gallery"); Gallery gallery = (Gallery) findViewById(R.id.gallery); // 爲縮略圖瀏覽器指定⼀個適配器 gallery.setAdapter(new ImageAdapter(this)); // 響應在縮略圖列表上選中某個縮略圖後的事件 gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(_Gallery.this, String.valueOf(position), Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } // 繼承 BaseAdapter 用以實現自定義的圖片適配器 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView image = new ImageView(mContext); image.setImageResource(mThumbIds[position]); image.setAdjustViewBounds(true); image.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return image; } } // 須要顯示的圖片集合 private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; } 三、ImageSwitcher 的 Demo imageswitcher.xml 代碼 <?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"> <Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="wrap_content" android:spacing="20px" />  <ImageSwitcher android:id="@+id/imageSwitcher" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _ImageSwitcher.java 代碼 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher; import android.widget.Gallery.LayoutParams; // 圖片轉換器的使用基本同文字轉換器 // 如下是⼀個用 ImageSwitcher + Gallery 實現的經典的圖片瀏覽器的 Demo public class _ImageSwitcher extends Activity implements ViewSwitcher.ViewFactory { private ImageSwitcher mSwitcher; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imageswithcer); setTitle("ImageSwithcer"); mSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher); mSwitcher.setFactory(this); mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); Gallery gallery = (Gallery) findViewById(R.id.gallery); gallery.setAdapter(new ImageAdapter(this)); gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View v, int position, long id) { mSwitcher.setImageResource(mImageIds[position]); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView image = new ImageView(mContext); image.setImageResource(mThumbIds[position]); image.setAdjustViewBounds(true); image.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return image; } } private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; @Override public View makeView() { ImageView image = new ImageView(this); image.setMinimumHeight(200); image.setMinimumWidth(200); image.setScaleType(ImageView.ScaleType.FIT_CENTER); image.setLayoutParams(new ImageSwitcher.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return image; } } 四、GridView 的 Demo gridview.xml 代碼 <?xml version="1.0" encoding="utf-8"?>  <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10px" android:verticalSpacing="10px" android:horizontalSpacing="10px" android:numColumns="auto_fit" android:columnWidth="60px" android:stretchMode="columnWidth" android:gravity="center"> </GridView> _GridView.java 代碼 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; public class _GridView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.gridview); setTitle("GridView"); GridView gridView = (GridView) findViewById(R.id.gridView); // 指定網格控件的適配器爲自定義的圖片適配器 gridView.setAdapter(new ImageAdapter(this)); } // 自定義的圖片適配器 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(48, 48)); imageView.setAdjustViewBounds(false); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(5, 5, 5, 5); } else { imageView = (ImageView) convertView; } imageView.setImageResource(mThumbIds[position]); return imageView; } // 網格控件所需圖片數據的數據源 private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; } } 五、ListView 的 Demo main_list_adapter.xml 代碼 <?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="16sp"> </TextView> </LinearLayout> MainListAdapter.java 代碼 package com.webabcd.view; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; // 繼承 BaseAdapter 以實現自定義的列表適配器 public class MainListAdapter extends BaseAdapter { private LayoutInflater mInflater; private List<String> mData; public MainListAdapter(Context context, List<String> data) { mInflater = LayoutInflater.from(context); mData = data; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { TextView text; if (convertView == null) { // 指定⼀個 layout 做爲自定義列表適配器的 layout convertView = mInflater.inflate(R.layout.main_list_adapter, null); text = (TextView) convertView.findViewById(R.id.text); convertView.setTag(text); } else { text = (TextView) convertView.getTag(); } String mItem = mData.get(position); text.setText(mItem); return convertView; } } Main.java 代碼 package com.webabcd.view; import java.util.ArrayList; import java.util.List; import android.app.ListActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.ListView; // 此處要繼承 ListActivity ，用以實現 ListView 的功能 public class Main extends ListActivity { private List<String> mData; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTheme(android.R.style.Theme_Light); setContentView(R.layout.main); mData = getData(); // 使用自定義的列表適配器來展示數據 // 使用自定義的列表適配器來展示數據 MainListAdapter adapter = new MainListAdapter(this, mData); // 如需使用系統內置的列表適配器，則能夠使用相似以下的方法 // ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, mData); this.setListAdapter(adapter); } // ListView 的數據源 private List<String> getData() { List<String> items = new ArrayList<String>(); items.add("TextView"); items.add("Button"); items.add("ImageButton"); items.add("ImageView"); items.add("CheckBox"); items.add("RadioButton"); items.add("AnalogClock"); items.add("DigitalClock"); items.add("DatePicker"); items.add("TimePicker"); items.add("ToggleButton"); items.add("EditText"); items.add("ProgressBar"); items.add("SeekBar"); items.add("AutoCompleteTextView"); items.add("MultiAutoCompleteTextView"); items.add("ZoomControls"); items.add("Include"); items.add("VideoView"); items.add("WebView"); items.add("RatingBar"); items.add("Tab"); items.add("Spinner"); items.add("Chronometer"); items.add("ScrollView"); items.add("TextSwitcher"); items.add("ListView"); items.add("Gallery"); items.add("ImageSwitcher"); items.add("GridView"); items.add("ExpandableList"); return items; } // ListView 中某項被選中後的邏輯 @Override protected void onListItemClick(ListView l, View v, int position, long id) { Intent intent = new Intent(); intent.setClassName(this, "com.webabcd.view._" + mData.get(position)); startActivityForResult(intent, 0); } } 六、ExpandableList 的 Demo _ExpandableList.java 代碼 package com.webabcd.view; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.ContextMenu; import android.view.Gravity; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.TextView; import android.widget.Toast; import android.widget.ExpandableListView.ExpandableListContextMenuInfo; // ExpandableList - 可展開/收縮列表 // 繼承 ExpandableListActivity 以實現列表的可展開/收縮的功能 public class _ExpandableList extends ExpandableListActivity { private ExpandableListAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setTitle("ExpandableList"); mAdapter = new MyExpandableListAdapter(); setListAdapter(mAdapter); registerForContextMenu(this.getExpandableListView()); } // 爲列表的每⼀項建立上下文菜單（即長按後呼出的菜單） @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.setHeaderTitle("ContextMenu"); menu.add(0, 0, 0, "ContextMenu"); } // 單擊上下文菜單後的邏輯 @Override public boolean onContextItemSelected(MenuItem item) { ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo(); String title = ((TextView) info.targetView).getText().toString(); int type = ExpandableListView.getPackedPositionType(info.packedPosition); if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition); Toast.makeText(this, title + " - Group Index: " + groupPos + " Child Index: " + childPos, Toast.LENGTH_SHORT).show(); return true; } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); Toast.makeText(this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show(); return true; } return false; } public class MyExpandableListAdapter extends BaseExpandableListAdapter { // 父列表數據 private String[] groups = { "group1", "group2", "group3", "group4" }; // 子列表數據 private String[][] children = { { "child1" }, { "child1", "child2" }, { "child1", "child2", "child3" }, { "child1", "child2", "child3", "child4" } }; @Override public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } // 取子列表中的某⼀項的 View @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } @Override public Object getGroup(int groupPosition) { return groups[groupPosition]; } @Override public int getGroupCount() { return groups.length; } @Override public long getGroupId(int groupPosition) { return groupPosition; } // 取父列表中的某⼀項的 View @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString()); return textView; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } // 獲取某⼀項的 View 的邏輯 private TextView getGenericView() { AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 48); TextView textView = new TextView(_ExpandableList.this); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); textView.setPadding(32, 0, 0, 0); return textView; } } } OK

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