Activity之间的数据传递-android学习之旅（四十七）

activity之间的数据传递主要有两种，一种是直接发送数据，另一种接受新启动的activity返回的数据，本质是一样的

使用Bundle传递数据

代码示例

dto类person

package peng.liu.test;

import java.io.Serializable;

/**
* Created by lplp on 2015/6/22.
*/
public class Person implements Serializable{
private String name;
private String passwd;
private String sex;
public Person(String name,String passwd,String male){
this.name = name;
this.passwd = passwd;
this.sex = male;
}
public String getName(){
return this.name;
}
public String getpasswd(){
return this.passwd;
}
public String getSex(){
return this.sex;
}
public void setName(String name){
this.name = name;
}
public void setPasswd(String passwd){
this.passwd = passwd;
}
public void  setSex(String sex){
this.sex = sex;
}
}

package peng.liu.test;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btnSend).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText name = (EditText) findViewById(R.id.name);
EditText passwd = (EditText) findViewById(R.id.passwd);
RadioButton male = (RadioButton) findViewById(R.id.male);
String gender = male.isChecked() ? "男":"女";
Person p = new Person(name.getText().toString(),passwd.getText().toString(),gender);
Bundle data = new Bundle();
data.putSerializable("person",p);
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
intent.putExtra(data);
startActivity(intent);
}
});
}
}

package peng.liu.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity2 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cell);
Intent intent = getIntent();
Person p = (Person) intent.getSerializableExtra("person");
TextView name = (TextView) findViewById(R.id.name);
TextView passwd = (TextView) findViewById(R.id.passwd);
TextView sex = (TextView) findViewById(R.id.sex);
name.setText(p.getName());
passwd.setText(p.getpasswd());
sex.setText(p.getSex());
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="请输入您的注册信息"
android:textSize="20sp"/>
<TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="用户名："
android:textSize="16sp"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/name"
android:hint="输入您的注册名字"
android:selectAllOnFocus="true"/>
</TableRow>
<TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="密码："
android:textSize="16sp"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/passwd"
android:password="true"
android:selectAllOnFocus="true"/>
</TableRow>
<TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="密码："
android:textSize="16sp"/>
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/male"
android:textSize="16sp"
android:text="男"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/female"
android:textSize="16sp"
android:text="女"/>
</RadioGroup>
</TableRow>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/btnSend"
android:text="注册"
android:textSize="16sp"/>
</TableLayout>
</LinearLayout>

<?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="vertical">

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/name"
android:textSize="18sp"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/passwd"
android:textSize="18sp"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/sex"
android:textSize="18sp"/>

</LinearLayout>

启动第二个Activity并返回结果

代码示例

package peng.liu.test;

import android.app.Activity;
import android.app.ExpandableListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity2 extends ExpandableListActivity {
private String[] provinces = new String[]{"shandong","shandong","shandong","shandong"};
private String[][] citys = new String[][]{
{"xian","xian","xian","xian"},
{"xian","xian","xian","xian"},
{"xian","xian","xian","xian"},
{"xian","xian","xian","xian"}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cell);
ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
@Override
public int getGroupCount() {
return provinces.length;
}

@Override
public int getChildrenCount(int i) {
return 0;
}

@Override
public Object getGroup(int i) {
return citys[i].length;
}

@Override
public Object getChild(int i, int i2) {
return citys[i][i2];
}

@Override
public long getGroupId(int i) {
return i;
}

@Override
public long getChildId(int i, int i2) {
return i2;
}
public TextView getTextView(){
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64);
TextView textView = new TextView(MainActivity2.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
textView.setPadding(36,0,0,0);
textView.setTextSize(20);
return textView;
};
@Override
public boolean hasStableIds() {
return true;
}

@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
LinearLayout ll = new LinearLayout(MainActivity2.this);
ll.setOrientation(LinearLayout.VERTICAL);
ImageView image = new ImageView(MainActivity2.this);
ll.addView(image);
TextView text = getTextView();
text.setText(getGroup(i).toString());
ll.addView(text);
return ll;
}

@Override
public View getChildView(int i, int i2, boolean b, View view, ViewGroup viewGroup) {
TextView text = getTextView();
text.setText(getChild(i,i2).toString());
return text;
}

@Override
public boolean isChildSelectable(int i, int i2) {
return true;
}
};
setListAdapter(adapter);
getExpandableListView().setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i2, long l) {
Intent intent = getIntent();
intent.putExtra("city",citys[i][i2]);
MainActivity2.this.setResult(0,intent);
MainActivity2.this.finish();
return false;
}
});
}
}

package peng.liu.test;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends Activity{
EditText city;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
city = (EditText) findViewById(R.id.city);
findViewById(R.id.btnCity).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this,MainActivity2.class);
startActivityForResult(intent,0);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Bundle intent = data.getExtras();
String city1 = intent.getString("city");
city.setText(city1);
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/city"
android:text="city"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/btnCity"
android:text="select"/>
</LinearLayout>

这里写代码片