一、简介：
ListView，列表视图，直接继承了AbsListView，是一个以垂直方式在项目中显示View视图的列表。ListView的数据项，来自一个继承了ListAdapter接口的适配器。
二、新建一个包listview并新建ListViewActivity.java活动：
12345678 |
public class ListViewActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view); }}
|
三、在AndroidManifest.xml中声名activity：
1 |
<activity android:name=".listview.ListViewActivity"></activity> |
四、建立activity_list_view.xml布局：
123456 |
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> </LinearLayout> |
五、在activity_main.xml中新建一个按钮：
123456 |
<Button android:id="@+id/btn_listview" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="ListView" android:textAllCaps="false"/> |
六、在MainActivity.java中声名控件：
1 |
private Button mBtnListView; |
七、在MainActivity.java中找到控件：
1 |
mBtnListView=findViewById(R.id.btn_listview); |
八、设置点击事件：
12345678 |
mBtnListView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //跳转到ListView演示页面 Intent intent=new Intent(MainActivity.this,ListViewActivity.class); startActivity(intent); } });
|
九、在activity_list_view.xml布局中写代码：
123456789101112 |
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lv_1" android:layout_width="match_parent" android:layout_height="wrap_content"> </ListView></LinearLayout> |
十、新建layout_list_item.xml:
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051 |
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:paddingLeft="15dp" android:paddingRight="15dp" android:paddingTop="10dp" android:paddingBottom="10dp"> <ImageView android:id="@+id/iv" android:layout_width="100dp" android:layout_height="100dp" android:scaleType="centerCrop" android:background="#000"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="10dp"> <TextView android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello" android:textSize="20sp" android:textColor="#000"/> <TextView android:id="@+id/tv_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="2018-11-27" android:textSize="18sp" android:textColor="#808080" android:layout_marginTop="10dp"/> <TextView android:id="@+id/tv_content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="这是内容" android:textSize="18sp" android:textColor="#808080" android:layout_marginTop="10dp"/> </LinearLayout></LinearLayout> |
十一、在包listview中新建MyListAdapter.java继承自BaseAdapter:
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152 |
public class MyListAdapter extends BaseAdapter {
private Context mContext; private LayoutInflater mLayoutInflater;
public MyListAdapter(Context context){ this.mContext=context; mLayoutInflater=LayoutInflater.from(context); }
@Override public int getCount() { return 10; }
@Override public Object getItem(int i) { return null; }
@Override public long getItemId(int i) { return 0; }
static class ViewHolder{ public ImageView imageView; public TextView tvTitle,tvTime,tvContent; }
@Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder=null; if(convertView==null){ convertView=mLayoutInflater.inflate(R.layout.layout_list_item,null); holder=new ViewHolder(); holder.imageView=convertView.findViewById(R.id.iv); holder.tvTitle=convertView.findViewById(R.id.tv_title); holder.tvTime=convertView.findViewById(R.id.tv_time); holder.tvContent=convertView.findViewById(R.id.tv_content); convertView.setTag(holder); }else{ holder=(ViewHolder)convertView.getTag(); } //给控件赋值 holder.tvTitle.setText("这是标题"); holder.tvTime.setText("2018-11-28"); holder.tvContent.setText("这是内容"); Glide.with(mContext).load("https://www.baidu.com/img/bd_logo1.png?where=super").into(holder.imageView); return convertView; }}
|
十二、在ListViewActivity.java中写代码：
12345678910111213 |
public class ListViewActivity extends AppCompatActivity {
private ListView mLv1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view);
mLv1=findViewById(R.id.lv_1); mLv1.setAdapter(new MyListAdapter(ListViewActivity.this)); }}
|
运行结果：
十三、在drawable下新建一个list_item:
1234567 |
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_selected="true" android:drawable="@color/colorAccent"/> <item android:state_pressed="true" android:drawable="@color/colorAccent"/> <item android:state_focused="true" android:drawable="@color/colorAccent"/> <item android:drawable="@color/colorWhite"/></selector> |
十四、在activity_list_view.xml下配置：
12345678910111213 |
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lv_1" android:layout_width="match_parent" android:layout_height="wrap_content" android:listSelector="@drawable/list_item"> </ListView></LinearLayout> |
运行截图：
十五、在ListViewActivity.java设置点击和长按事件：
1234567891011121314 |
mLv1.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { Toast.makeText(ListViewActivity.this,"点击 pos:"+position,Toast.LENGTH_SHORT).show(); } });
mLv1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) { Toast.makeText(ListViewActivity.this,"长按 pos:"+position,Toast.LENGTH_SHORT).show(); return true;//松开后不会显示点击事件 } });
|
运行截图：
原文地址：https://www.cnblogs.com/ycmqaq/p/10029951.html
时间： 2024-07-28 18:33:24