Android APP－－通过Parcelable机制传递复杂的对象_android parcelable hashmap-优快云博客

这篇博客探讨了如何在Android应用中利用Parcelable机制传递复杂的对象。通过创建两个Activity，博主展示了在用户交互（点击屏幕）时，如何用Parcelable实现对象（如BinderData和MyColor）在Activity间的传递，以此改变屏幕颜色并实现Activity之间的流畅切换。

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建立两个Activity，当点击屏幕的时候，调到另外一个Activity，设置屏幕颜色，彼此来回切换。

新建BinderData.java类

package com.android.testrecord;

import android.os.Binder;

/**
 * Created by wang on 16-11-1.
 */
public class BinderData extends Binder {
    private int color;
    public int getColor() {
        return color;
    }
    public void setColor(int color) {
        this.color = color;
    }
}

新建MyColor.java 类

package com.android.testrecord;

import android.graphics.Color;
import android.os.Parcel;
import android.os.Parcelable;

/**
 * Created by wang on 16-11-1.
 */
public class MyColor implements Parcelable{
    private BinderData data = new BinderData();

    public MyColor() {
        data.setColor(Color.BLACK);
    }

    protected MyColor(Parcel in) {
        data = (BinderData) in.readValue(BinderData.class.getClassLoader());
    }

    public int getColor() {
        return data.getColor();
    }

    public void setColor(int color) {
         data.setColor(color);
    }

    public static final Creator<MyColor> CREATOR = new Creator<MyColor>() {
        @Override
        public MyColor createFromParcel(Parcel in) {
            return new MyColor(in);
        }

        @Override
        public MyColor[] newArray(int size) {
            return new MyColor[size];
        }
    };

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeValue(data);
    }
}

建立两个Activity,分别命名为MainActivity.java和SubActivity.java

package com.android.testrecord;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.MotionEvent;

public class MainActivity extends Activity {
    private final int SUB_ACTIVITY = 0;
    private MyColor color = new MyColor();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == SUB_ACTIVITY) {
            if (resultCode == RESULT_OK) {
                if (data.hasExtra("MyColor")) {
                    // color = data.getParcelableExtra("MyColor");
                    findViewById(R.id.text).setBackgroundColor(color.getColor());
                }
            }
        }
    }
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            Intent intent = new Intent();
            intent.setClass(this, SubActivity.class);
            color.setColor(Color.RED);
            intent.putExtra("MyColor", color);
            startActivityForResult(intent, SUB_ACTIVITY);
        }
        return super.onTouchEvent(event);
    }
}

package com.android.testrecord;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.TextView;

/**
 * Created by wang on 16-11-1.
 */
public class SubActivity extends Activity{
    private MyColor color;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ((TextView)findViewById(R.id.text)).setText("SubActivity");
        Intent intent = getIntent();
        if (intent != null) {
            if (intent.hasExtra("MyColor")) {
                color = intent.getParcelableExtra("MyColor");
                findViewById(R.id.text).setBackgroundColor(color.getColor());
            }
        }
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            Intent intent = new Intent();
            if (color != null) {
                color.setColor(Color.GREEN);
                intent.putExtra("MyColor", color);
            }
            setResult(RESULT_OK, intent);
            finish();
        }
        return super.onTouchEvent(event);
    }
}

建立资源布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.android.comeon.MainActivity">

    <TextView
        android:id="@+id/text"
        android:textSize="50dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="MainActivity"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>
</RelativeLayout>

注意需要在AndroidManifest.xml文件中添加

        <activity android:name=".SubActivity">

        </activity>

输出：