Activity传值

Activity页面跳转传值

第一种方法：(Intent)

发送方：

Intent intent = new Intent();
intent.putExtra("name", "诸葛亮");
intent.putExtra("age", 50);
intent.putExtra("IQ", 200.0f);
intent.setClass(MainActivity.this, SecondActivity.class);
MainActivity.this.startActivity(intent);

接受方：

Intent intent = getIntent();
String name = intent.getStringExtra("name");
int age = intent.getIntExtra("age", 0);
float IQ = intent.getFloatExtra("IQ", 0.0f);
textview2.setText("name:"+name+",age:"+age+",IQ:"+IQ);

第二种方法：(Bundle)

发送方：

Intent intent = new Intent();
Bundle bundle = new Bundle();
bundle.putString("name", "乔峰");
bundle.putInt("age", 40);
bundle.putFloat("weight", 70.4f);
intent.putExtras(bundle);
intent.setClass(MainActivity.this, SecondActivity.class);
startActivity(intent);

接受方:

Intent intent = getIntent();
Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
int age = bundle.getInt("age");
float weight = bundle.getFloat("weight");
textview.setText(name+","+age+","+weight);

第三种方法：(Application)

首先要新建一个继承Application的MyApp类，补充属性的get/set方法

AndroidManifest.xml也要配置application的属性android:name=".MyApp"

发送方：

MyApp myApp = (MyApp) getApplication();
myApp.setName("周星驰");
Intent intent = new Intent();
intent.setClass(MainActivity.this, SecondActivity.class);
startActivity(intent);

接受方：

MyApp myApp = (MyApp) getApplication();
String name = myApp.getName();
textview = (TextView) findViewById(R.id.textview);
textview.setText(name);

第四种方法：(推荐)

对象类要实现Parclelable接口

发送方：

Intent intent = new Intent();
Person person = new Person("孙悟空",500,55.6f);
intent.putExtra("person", person);
intent.setClass(MainActivity.this, SecondActivity.class);
startActivity(intent);

接受方：

Intent intent = getIntent();
Person person = intent.getParcelableExtra("person");
textview = (TextView) findViewById(R.id.textview);
textview.setText(person.toString());

对象类：

public class Person implements Parcelable {
    private String name;
    private int age;
    private float weight;

    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Person(String name, int age, float weight) {
        super();
        this.name = name;
        this.age = age;
        this.weight = weight;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public float getWeight() {
        return weight;
    }

    public void setWeight(float weight) {
        this.weight = weight;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", weight=" + weight + "]";
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(age);
        dest.writeFloat(weight);
    }

    public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
        public Person createFromParcel(Parcel in) {
            return new Person(in);
        }

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

    private Person(Parcel in) {
        name = in.readString();
        age = in.readInt();
        weight = in.readFloat();
    }
}