Android每点击一次按钮就添加一条数据
需求
每点击一次按钮就添加一条数据(图片+文字)
项目目录
.java
.domain
Data
package top.gaojc.calculator.domain;
public class Data {
private int imgId;
private String content;
public Data() {
}
public Data(int imgId, String content) {
this.imgId = imgId;
this.content = content;
}
public int getImgId() {
return imgId;
}
public String getContent() {
return content;
}
public void setImgId(int imgId) {
this.imgId = imgId;
}
public void setContent(String content) {
this.content = content;
}
}
MainActivity.java
package top.gaojc.calculator;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import java.util.LinkedList;
import java.util.List;
import top.gaojc.calculator.domain.Data;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
// 初始化
Button btn_add;
int flag = 1;
private ListView list_one;
private MyAdapter mAdapter = null;
private List<Data> mData = null;
private Context mContext = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = MainActivity.this;
bindViews();
mData = new LinkedList<Data>();
mAdapter = new MyAdapter((LinkedList<Data>) mData,mContext);
list_one.setAdapter(mAdapter);
btn_add = findViewById(R.id.btn_add);
btn_add.setOnClickListener(this);
}
private void bindViews(){
list_one = (ListView) findViewById(R.id.list_one);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.btn_add:
mAdapter.add(new Data(R.drawable.girl,"想你想你想我!!! × " + flag));
flag++;
break;
}
}
}
MyAdapter.java
package top.gaojc.calculator;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.LinkedList;
import top.gaojc.calculator.domain.Data;
public class MyAdapter extends BaseAdapter {
private Context mContext;
private LinkedList<Data> mData;
public MyAdapter() {
}
public MyAdapter(LinkedList<Data> mData, Context mContext) {
this.mData = mData;
this.mContext = mContext;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null){
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list,parent,false);
holder = new ViewHolder();
holder.img_icon = (ImageView) convertView.findViewById(R.id.img_icon);
holder.txt_content = (TextView) convertView.findViewById(R.id.txt_content);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.img_icon.setImageResource(mData.get(position).getImgId());
holder.txt_content.setText(mData.get(position).getContent());
return convertView;
}
private class ViewHolder{
ImageView img_icon;
TextView txt_content;
}
public void add(Data data) {
if (mData == null) {
mData = new LinkedList<>();
}
mData.add(data);
notifyDataSetChanged();
}
}
.xml
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<Button
android:id="@+id/btn_add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="添加数据"/>
<ListView
android:id="@+id/list_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
item_list.xml
<?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">
<ImageView
android:id="@+id/img_icon"
android:layout_width="56dp"
android:layout_height="56dp"/>
<TextView
android:id="@+id/txt_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp"
android:textSize="18sp" />
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="top.gaojc.calculator">
<application
android:allowBackup="true"
android:icon="@drawable/girl"
android:label="@string/app_name"
android:roundIcon="@drawable/girl"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
页面效果