Android-Activity页面之间的数据传递

Activity之间传递数据

1.传递基本的数据类型

  基本数据类型：

整形：byte short int long

浮点：float double

布尔：boolean

字符：char

引用：String

2.传递数据包Bundle（集装箱）

3.传递对象（对象集合）

4..返回数据


例子：返回对象集合，效果图如下（两个界面之间的数据传递）：

图1                                                                                                                     图2：









图3                                                                                                             图4








XML代码：

activity_main.xml代码：

<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.cookie.android0616activityjump.MainActivity">

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_main_uname"
android:hint="请输入用户名"/>

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="写心情"
android:onClick="writeThink"/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_main_showThink"/>

</LinearLayout>

activity_think.xml代码：
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.cookie.android0616activityjump.MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_think_showName"/>

<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lines="5"
android:hint="请输入心情"
android:gravity="top"
android:id="@+id/et_think_someThink"
/>

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="确定"
android:onClick="ok"/>

</LinearLayout>
Java代码：

MainActivity.java

public class MainActivity extends AppCompatActivity {

private EditText et_main_text;
private TextView tv_main_showThink;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_main_text = (EditText) findViewById(R.id.et_main_uname);
tv_main_showThink = (TextView) findViewById(R.id.tv_main_showThink);

// Strin
aca2
g thinks=getIntent().getStringExtra("thinks");
// tv_main_showThink.setText(thinks);

}

//获取其他人设值过来的结果
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

String thinks=data.getStringExtra("thinks");
tv_main_showThink.setText(thinks);

}

public void writeThink(View view){
String uname=et_main_text.getText().toString();
Intent intent=new Intent(this,ThinkActivity.class);
//传递基本数据类型
// intent.putExtra("uname",uname);
// intent.putExtra("uage",19);
//传递Bundle
// Bundle bundle=new Bundle();
// bundle.putString("uname",uname);
// bundle.putInt("uage",10);
// intent.putExtra("bundle",bundle);
//传递对象
// Person person=new Person(1,"明明",10);

//传递对象集合
Person person1=new Person(1,"求其",20);
Person person2=new Person(2,"微微",12);
Person person3=new Person(3,"琪琪",30);

ArrayList<Person> persons=new ArrayList<>();
persons.add(person1);
persons.add(person2);
persons.add(person3);

//传递对象
//intent.putExtra("person",person);
//传递对象集合
intent.putParcelableArrayListExtra("persons",persons);

// startActivity(intent);
//带有目的的跳转(请求码，结果码)
startActivityForResult(intent,0x23);
}

}
ThinkActivity.java

public class ThinkActivity extends AppCompatActivity {

private TextView tv_think_showName;
private EditText et_think_someThink;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_think);
tv_think_showName = (TextView) findViewById(R.id.tv_think_showName);
et_think_someThink = (EditText) findViewById(R.id.et_think_someThink);

//获取第一个页面传递过来的数据
// String uname=getIntent().getStringExtra("uname");
//设值默认值
// int uage=getIntent().getIntExtra("uage",0);
//接收Bundle
// Bundle bundle=getIntent().getBundleExtra("bundle");
// String uname=bundle.getString("uname");
// int uage=bundle.getInt("uage");
// tv_think_showName.setText("你好："+uname+" "+uage);

//接收对象
// Person person= (Person) getIntent().getSerializableExtra("person");
//运用安卓的序列化进行接收对象
// Person person=getIntent().getParcelableExtra("person");
// tv_think_showName.setTextSize(30);
// tv_think_showName.setText("你好："+person.toString());
//接收对象集合
List<Person> persons=getIntent().getParcelableArrayListExtra("persons");
for (Person person : persons) {
tv_think_showName.setText(tv_think_showName.getText()+"\n"+person);
}

}

public void ok(View view){
String thinks=et_think_someThink.getText().toString();
Intent intent=new Intent(this,MainActivity.class);
intent.putExtra("thinks",thinks);

//设值结果
setResult(0x12,intent);

//自杀（干掉自己，干掉当前的Activity）
finish();

//startActivity(intent);
}

}


还要在Java里建立一个entity包
里面建一个person.java实体类

它的代码如下：

//java序列化：Serializable 只可以传对象
//安卓序列化：Parcelable 既可以传对象，也可以传集合

public class Person implements Parcelable{

private int pid;
private String pname;
private int page;

public Person() {

}

public Person(int pid, String pname, int page) {
this.pid = pid;
this.pname = pname;
this.page = page;
}

//从序列化中读取方法
protected Person(Parcel in) {
pid = in.readInt();
pname = in.readString();
page = in.readInt();
}

public static final Creator<Person> CREATOR = new Creator<Person>() {
@Override
public Person createFromParcel(Parcel in) {
return new Person(in);
}

@Override
public Person[] newArray(int size) {
return new Person[size];
}
};

public int getPid() {
return pid;
}

public void setPid(int pid) {
this.pid = pid;
}

public String getPname() {
return pname;
}

public void setPname(String pname) {
this.pname = pname;
}

public int getPage() {
return page;
}

public void setPage(int page) {
this.page = page;
}

@Override
public String toString() {
return "Person{" +
"pid=" + pid +
", pname='" + pname + '\'' +
", page=" + page +
'}';
}

@Override
public int describeContents() {
return 0;
}

//Parcel:序列化
//把属性写到序列化中
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(pid);
dest.writeString(pname);
dest.writeInt(page);
}
}