Parcelable使用(二)

简单的Activity间数据传递用Intent,复杂的用Parcelable,举个栗子第一个activity写入Parcel的String类型的name和int类型的age,第二个activity取出Parcel并解析数据

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                MyPerson mMyPerson = new MyPerson();
                mMyPerson.setName("tom");
                mMyPerson.setAge(25);
                Intent mIntent = new Intent(MainActivity.this, Main2Activity.class);
                Bundle mBundle = new Bundle();
                mBundle.putParcelable("key", mMyPerson);
                mIntent.putExtras(mBundle);
                startActivity(mIntent);

            }
        });
    }
}

上面是第一个activity

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        TextView textView = findViewById(R.id.text);
        MyPerson parcelable = getIntent().getParcelableExtra("key");
        textView.setText("name = " + parcelable.getName() + "  age = " + parcelable.getAge());

    }
}

上面试第二个activity

public class MyPerson implements Parcelable{
    private String name;
    private int age;
    private static final String TAG = "Text";
    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 static final Parcelable.Creator<MyPerson> CREATOR = new Creator<MyPerson>() {
        @Override
        public MyPerson createFromParcel(Parcel source) {
            Log.d(TAG,"createFromParcel");
            MyPerson mMyPerson = new MyPerson();
            mMyPerson.name = source.readString();
            mMyPerson.age = source.readInt();
            return mMyPerson;
        }
        @Override
        public MyPerson[] newArray(int size) {
// TODO Auto-generated method stub
            return new MyPerson[size];
        }
    };
    @Override
    public int describeContents() {
// TODO Auto-generated method stub
        Log.d(TAG,"describeContents");
        return 0;
    }
    @Override
    public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
        Log.d(TAG,"writeToParcel");
        dest.writeString(name);
        dest.writeInt(age);
    }
}

实现Parcelable接口