Intent传递集合数据
16lz
2021-01-26
android中Activity与Activity之间相互传递一般都是通过Intent来进行之间的通信,所谓通信就是数据之间的传输,不要被所谓的名字吓到了,现在新建一个Demo 演示Activity之间是如何通过Intent传递数据,
activity_main.xml 就一个简单的Button按钮
MainActivity.java
public class MainActivity extends Activity {private Button btn_pass;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn_pass = (Button) findViewById(R.id.btn_pass);btn_pass.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {ArrayList persons = new ArrayList();for(int i=0;i<1000;i++){Person p = new Person();p.age = i+1;p.name="a"+i;persons.add(p);}Intent intent = new Intent(MainActivity.this,SecnodActivity.class);intent.putExtra("persons", persons);startActivity(intent);}});}} person.java传递的实体类,
public class Person implements Serializable{private static final long serialVersionUID = 1L;public int age;public String name;}Person就封装了二个属性 但是Person类是实现了Serializable接口
点击按钮跳转到SecnodActivity.java 界面中,然后通过listview把传递过来的数据展示在界面上
public class SecnodActivity extends Activity {private ListView listview;private List persons;private LayoutInflater inflater;protected void onCreate(android.os.Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_secnod);Intent intent = getIntent();if(intent!=null){persons = (List) intent.getSerializableExtra("persons");}listview = (ListView) findViewById(R.id.listview);inflater = LayoutInflater.from(this);MyAdapter adapter = new MyAdapter();listview.setAdapter(adapter);}class MyAdapter extends BaseAdapter{@Overridepublic int getCount() {return persons.size();}@Overridepublic Object getItem(int position) {return persons.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder viewHolder; if(convertView==null){ viewHolder = new ViewHolder(); convertView = inflater.inflate(R.layout.item, null); viewHolder.tvAge = (TextView) convertView.findViewById(R.id.tvAge); viewHolder.tvName = (TextView) convertView.findViewById(R.id.tvName); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.tvAge.setText("年龄: "+persons.get(position).age); viewHolder.tvName.setText("年龄: "+persons.get(position).name); return convertView;}}class ViewHolder{TextView tvAge;TextView tvName;}}
界面图：
总结：总之通过Intent传递集合时,记得把集合中存储的对象实现Serializable接口
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