(Android review)Activity之间的数据传递

一、基本知识点

1、Activity之间传递数据
1）传递基本类型或String
intent.putExtra("username", username);
 
 getIntent();
 intent.getStringExtra("username");

2）以bundle的形式传

Bundle bundle = new Bundle();
    bundle.putString("username", username);
    bundle.putString("password", password);
   
    intent.putExtras(bundle);

Bundle bundle = intent.getExtras();
String username = bundle.getString("username");
String password = bundle.getString("password");

3）传递自定义类型

1））implements Parcelable
2））重写以下两个方法
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}

//把数据写入到Parcel对象
public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
dest.writeInt(id);
dest.writeString(name);
dest.writeInt(age);
}

3））拷贝以下方法（把Person换成你的实际类型）

public static final Parcelable.Creator<Person> CREATOR
   = new Parcelable.Creator<Person>() {
    //从Parcel对象里面读取数据
public Person createFromParcel(Parcel in) {
   return new Person(in);
}

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

public Person(Parcel in) {
// TODO Auto-generated constructor stub
id = in.readInt();
name = in.readString();
age = in.readInt();
}

Person person = new Person(100, "张信哲", 40);
    intent.putExtra("person", person);

Person person = intent.getParcelableExtra("person");

二、代码

1、MainActivity

package com.example.parsedata;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {

	private EditText et_username;
	private EditText et_password;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		et_username = (EditText) findViewById(R.id.et_username);
		et_password = (EditText) findViewById(R.id.et_password);
	}

	public void enter(View view) {

		String username = et_username.getText().toString();
		String password = et_password.getText().toString();

		Intent intent = new Intent(this, MainActivity2.class);
		intent.putExtra("username", username);
		intent.putExtra("password", password);

		Bundle bundle = new Bundle();
		bundle.putString("zhangzetian", "huangjundong");
		intent.putExtras(bundle);

		Person person = new Person(2, "hjd is a handsomeboy..", 21);
		intent.putExtra("person", person);

		startActivity(intent);

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

2、MainActivity2

package com.example.parsedata;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity2 extends Activity {

	private TextView tv_info;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main2);

		tv_info = (TextView) findViewById(R.id.tv_info);

		Intent intent = getIntent();
		String username = intent.getStringExtra("username");
		String password = intent.getStringExtra("password");

		Bundle bundle = intent.getExtras();

		Person p = intent.getParcelableExtra("person");

		tv_info.setText("username: " + username + ",password: " + password + "zhangzetian‘s husband is : " + bundle.getString("zhangzetian") + " person: " + p.toString());

	}

}

三、源码下载：

http://download.csdn.net/detail/caihongshijie6/7792903

四、效果图

(Android review)Activity之间的数据传递,布布扣,bubuko.com