Android开发-ListView, GridView,Scrollview

ListView

  • 常用属性
  • Adapter接口
  • Demo演示
listview效果图

activity_listview.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    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"
        android:divider="#B92727"
        android:dividerHeight="2dp"
        />

</LinearLayout>

ListViewActivity

public class ListViewActivity extends Activity {

    private ListView mLv1;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_listview);
        mLv1 = findViewById(R.id.lv_1);
        mLv1.setAdapter(new MyListAdapter(ListViewActivity.this));
        mLv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(ListViewActivity.this, "点击 Pos:" + position, Toast.LENGTH_SHORT).show();
                // 跳转
            }
        });

        mLv1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(ListViewActivity.this, "长按 Pos:" + position, Toast.LENGTH_SHORT).show();
                return false;
            }
        });
    }
}

MyListAdapter

public class MyListAdapter extends BaseAdapter {

    private Context mContext;
    private LayoutInflater mLayoutInflater;

    public MyListAdapter(Context context) {
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        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();
        }
        holder.tvTitle.setText("这是标题");
        holder.tvTime.setText("2099-09-09");
        holder.tvContent.setText("这是内容");
        Glide.with(mContext).load("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1603459341312&di=bc520d0ed58b8e3786e74ef3f8442985&imgtype=0&src=http%3A%2F%2Fz1.dfcfw.com%2F2020%2F10%2F14%2F20201014075848343834694.jpg").into(holder.imageView);
        return convertView;
    }
}

GridView

  • 常用属性
  • Adapter接口
  • Demo演示

效果图


gridview 效果图

activity_gridview.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    >
    <GridView
        android:id="@+id/gv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="3"
        android:horizontalSpacing="10dp"
        android:verticalSpacing="10dp"
        />
</LinearLayout>

layout_grid_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/iv_grid"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:scaleType="fitCenter"
        android:background="@color/colorBlack"/>

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="hello"
        android:gravity="center"
        android:textColor="@color/colorGray"
        android:layout_marginTop="10dp"
        />
</LinearLayout>

GridViewActivity

public class GridViewActivity extends AppCompatActivity {

    private GridView mGv;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gridview);
        mGv = findViewById(R.id.gv);
        mGv.setAdapter(new MyGridViewAdapter(GridViewActivity.this));
        mGv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(GridViewActivity.this, "点击：" + position, Toast.LENGTH_SHORT).show();
            }
        });
        mGv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(GridViewActivity.this, "长按：" + position, Toast.LENGTH_SHORT).show();
                return true;
            }
        });
    }
}

MyGidViewAdapter

public class MyGridViewAdapter extends BaseAdapter {

    private Context mContext;
    private LayoutInflater mLayoutInflater;

    public MyGridViewAdapter(Context context) {
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    static class ViewHolder {
        public ImageView imageView;
        public TextView tvTitle;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = mLayoutInflater.inflate(R.layout.layout_grid_item, null);
            holder = new ViewHolder();
            holder.imageView = convertView.findViewById(R.id.iv_grid);
            holder.tvTitle = convertView.findViewById(R.id.tv_title);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.tvTitle.setText("花");
        Glide.with(mContext).load("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1603459341312&di=bc520d0ed58b8e3786e74ef3f8442985&imgtype=0&src=http%3A%2F%2Fz1.dfcfw.com%2F2020%2F10%2F14%2F20201014075848343834694.jpg").into(holder.imageView);
        return convertView;
    }
}

ScrollView

  • 垂直滚动 ScrollView
  • 水平滚动 HorizontalScrollView
scrollview效果图
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <Button
            android:id="@+id/btn_textview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Button"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_editText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="EditText"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_radioBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioBtn"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_checkBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="CheckBox"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_imageview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="ImageView"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_listview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="ListView"
            android:textAllCaps="false"
            />

        <Button
            android:id="@+id/btn_gridview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="GridView"
            android:textAllCaps="false"
            />

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Test"
            android:textAllCaps="false"
            android:layout_marginTop="50dp"
            />


        <HorizontalScrollView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <Button
                    android:layout_width="200dp"
                    android:layout_height="300dp"
                    android:text="test"
                    android:textAllCaps="false"
                    />
                <Button
                    android:layout_width="200dp"
                    android:layout_height="300dp"
                    android:text="test"
                    android:textAllCaps="false"
                    />
                <Button
                    android:layout_width="200dp"
                    android:layout_height="300dp"
                    android:text="test"
                    android:textAllCaps="false"
                    />
                <Button
                    android:layout_width="200dp"
                    android:layout_height="300dp"
                    android:text="test"
                    android:textAllCaps="false"
                    />

            </LinearLayout>
        </HorizontalScrollView>
    </LinearLayout>

</ScrollView>
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