(Android review)Activity之間的數據傳遞

一、基本知識點

1、Activity之間傳遞數據
1）傳遞基本類型或String
intent.putExtra("username", username);

getIntent();
intent.getStringExtra("username");


2）以bundle的形式傳

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）傳遞自定義類型


1））implements Parcelable
2））重寫以下兩個方法
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}

//把數據寫入到Parcel對象
public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
dest.writeInt(id);
dest.writeString(name);
dest.writeInt(age);
}


3））拷貝以下方法（把Person換成你的實際類型）


public static final Parcelable.Creator CREATOR
= new Parcelable.Creator() {
//從Parcel對象裡面讀取數據
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, "張信哲", 40);
intent.putExtra("person", person);




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

二、代碼

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、源碼下載：

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

四、效果圖