Android 中Activity 之间传递参数
1.传递简单数据
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(MainActivity.this,TheActivity.class); // 对基础的数据类型进行传递 i.putExtra("data","我是国人"); startActivity(i); } });
在B Activity中接受数据
tv =(TextView)findViewById(R.id.TheTextView); Intent i = getIntent(); tv.setText(i.getStringExtra("data"));
这种传值就是传递基本的数据类型
2.传递数据 包Bundle
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(MainActivity.this,TheActivity.class); Bundle bundle = new Bundle(); bundle.putString("name","qll"); bundle.putInt("age",3); // i.putExtras(bundle); // 另种传递方式 i.putExtra("data",bundle); startActivity(i); } }); }
在B Activity中接受数据
tv =(TextView)findViewById(R.id.TheTextView); editText = (EditText) findViewById(R.id.editText3); Intent i = getIntent(); // Bundle date = i.getExtras(); // 接受方式不同 Bundle date = i.getBundleExtra("data"); tv.setText(String.format("name=%s,age=%d",date.getString("name"),date.getInt("age")));
这总传递方式类似iOS中传递字典数据类型过来 。
3.传递值对象
自定义一个User类，传递自定义类需要对类进行序列化
用Serializable进行序列化
这种方法只需要类实现Serializable接口就可以了
User 类
import java.io.Serializable; public class User implements Serializable{ private String name; private int age; public int getAge(){ return age; } public void setAge(int age){ this.age = age; } public String getName(){ return name; } public void setName(String name){ this.name = name; } public User(String name,int age){ this.name = name; this.age = age; }
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(MainActivity.this,TheActivity.class); i.putExtra("user",new User("qll",24)); startActivity(i); } }); }
在B Activity中
tv =(TextView)findViewById(R.id.TheTextView); User user = (User)i.getSerializableExtra("user"); tv.setText(String.format("user info(name=%s,age=%d)",user.getName(),user.getAge()));
用Parcelable实现
同样的需要实现Parcelable接口
User 类
package com.example.wyhaiapple.transferdata1; import android.os.Parcel; import android.os.Parcelable; import android.text.ParcelableSpan; public class User implements Parcelable{ private String name; private int age; public int getAge(){ return age; } public void setAge(int age){ this.age = age; } public String getName(){ return name; } public void setName(String name){ this.name = name; } public User(String name,int age){ this.name = name; this.age = age; } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeString(getName()); dest.writeInt(getAge()); } public static final Creator<User> CREATOR = new Creator<User>() { @Override public User createFromParcel(Parcel source) { return new User(source.readString(),source.readInt()); } @Override public User[] newArray(int size) { return new User[size]; } }; }
在A Activity中 与上面的相同
在B Activity中
tv =(TextView)findViewById(R.id.TheTextView); User user = (User)i.getParcelableExtra("user"); tv.setText(String.format("user info(name=%s,age=%d)",user.getName(),user.getAge()));
4.获取 Activity 的返回参数
在B Activity中
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_the); tv =(TextView)findViewById(R.id.TheTextView); editText = (EditText) findViewById(R.id.editText3); findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(); i.putExtra("data",editText.getText().toString()); setResult(1,i); finish(); } }); } }
在A Activity中
startActivityForResult(i,0); @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); textView.setText("返回的值："+data.getStringExtra("data")); }
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