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我想尝试用一小组 TextViews 创建一个 TableRow，每个 TextViews 都保存一个原始字符串数据。我想，也许如果我存储这些 TableRows 的 ArrayList，并且如果成功地来回读/写，我会简化很多时间来在 Android 屏幕上创建数据表或图表。

从表面上看，我觉得我必须创建很多 View 的子类，并为所有这些实现 Serializable。这完全超出了我的能力。

我的主要问题是：是否可以将一组 TextView 存储到 TableRow 中，创建一个充满 TableRows 的数组，并将它们中的每一个单独添加到 TableLayout 中？

到目前为止，我无法超越使用 ObjectOutputStream 保存数据，因为它不断抛出 NotSerializableException、InvalidAccessException、IllegalAccessException、EOFException、IOException 等各种不同的异常。

如果我的概念不是很好，请问我应该在哪里重新考虑？我应该改变什么，我应该如何存储数据组？提前致谢。

事不宜迟，这是我用来尝试保存 TableRows 的 ArrayList 的代码，以及我在过去 12 小时内不停地工作的所有笨蛋。

package tt.tt;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.io.StreamCorruptedException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class Test extends Activity implements OnClickListener, Serializable {

    private static final long serialVersionUID = 2466231508464769438L;

    public class Format implements Serializable {
        private static final long serialVersionUID = 1L;
        public String name;
        public long points;
        public int position;
    }

    List<Format> formats = new ArrayList<Format>();
    TableRow row;
    TableLayout layout;

    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        setContentView(R.layout.table);
        layout = (TableLayout) this.findViewById(R.id.table);
        Button make = (Button) this.findViewById(R.id.make);
        make.setOnClickListener(this);
        Button retrieve = (Button) this.findViewById(R.id.retrieve);
        retrieve.setOnClickListener(this);
    }

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.make:
                make();
                break;
            case R.id.retrieve:
                retrieve();
                break;
        }
    }

    public void make() {
        Random r = new Random();
        Format f = new Format();
        f.name = r.toString();
        f.points = r.nextLong();
        f.position = r.nextInt(10);
        formats.add(f);

        FileOutputStream out;
        try {
            out = this.openFileOutput("format", Activity.MODE_PRIVATE);
            ObjectOutputStream output = new ObjectOutputStream(new BufferedOutputStream(out));
            output.writeObject(formats);
            output.flush();
            output.close();
        }
        catch (FileNotFoundException e) {
            Log.d("Test", "Can't save data", e);
        }
        catch (IOException e) {
            Log.d("Test", "Can't save data", e);
        }

        TextView text = new TextView(this);
        text.setText(Integer.toString(f.position));
        row = new TableRow(this);
        row.addView(text, 0, TableRow.LayoutParams.WRAP_CONTENT);
        text = new TextView(this);
        text.setText(f.name);
        row.addView(text, 1, TableRow.LayoutParams.WRAP_CONTENT);
        text = new TextView(this);
        text.setText(Long.toString(f.points));
        row.addView(text, 2, TableRow.LayoutParams.WRAP_CONTENT);

        layout.addView(row);
    }

    public void retrieve() {
        layout.removeAllViews();
        FileInputStream in;
        try {
            in = this.openFileInput("format");
            ObjectInputStream input = new ObjectInputStream(new BufferedInputStream(in));
            List<Format> temp = (List<Format>) input.readObject();
            input.close();
        }
        catch (FileNotFoundException e) {
            Log.d("Test", "Can't load data", e);
        }
        catch (StreamCorruptedException e) {
            Log.d("Test", "Can't load data", e);
        }
        catch (IOException e) {
            Log.d("Test", "Can't load data", e);
        }
        catch (ClassNotFoundException e) {
            Log.d("Test", "Can't load data", e);
        }
    }

}

不幸的是，当我在这里到达这条线时：

output.writeObject(formats);

它抛出一个错误，从 Logcat 检索：

09-22 14:50:43.658: D/Test(29362): Can't save data
09-22 14:50:43.658: D/Test(29362): java.io.NotSerializableException: android.widget.TableLayout
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
09-22 14:50:43.658: D/Test(29362):  at java.util.ArrayList.writeObject(ArrayList.java:644)
09-22 14:50:43.658: D/Test(29362):  at java.lang.reflect.Method.invokeNative(Native Method)
09-22 14:50:43.658: D/Test(29362):  at java.lang.reflect.Method.invoke(Method.java:511)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1053)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
09-22 14:50:43.658: D/Test(29362):  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
09-22 14:50:43.658: D/Test(29362):  at tt.tt.Test.make(Test.java:75)
09-22 14:50:43.658: D/Test(29362):  at tt.tt.Test.onClick(Test.java:55)
09-22 14:50:43.658: D/Test(29362):  at android.view.View.performClick(View.java:3549)
09-22 14:50:43.658: D/Test(29362):  at android.view.View$PerformClick.run(View.java:14400)
09-22 14:50:43.658: D/Test(29362):  at android.os.Handler.handleCallback(Handler.java:605)
09-22 14:50:43.658: D/Test(29362):  at android.os.Handler.dispatchMessage(Handler.java:92)
09-22 14:50:43.658: D/Test(29362):  at android.os.Looper.loop(Looper.java:154)
09-22 14:50:43.658: D/Test(29362):  at android.app.ActivityThread.main(ActivityThread.java:4945)
09-22 14:50:43.658: D/Test(29362):  at java.lang.reflect.Method.invokeNative(Native Method)
09-22 14:50:43.658: D/Test(29362):  at java.lang.reflect.Method.invoke(Method.java:511)
09-22 14:50:43.658: D/Test(29362):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-22 14:50:43.658: D/Test(29362):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-22 14:50:43.658: D/Test(29362):  at dalvik.system.NativeStart.main(Native Method)
4

1 回答 1

0

经过长时间的星际争霸 2 会议，想通了。所有这些问题的真正解决方案是不为嵌套类实现接口 Serializable，无论是公共的、受保护的还是私有的。

我发誓，如果你在嵌套类中实现该接口，它也会尝试序列化外部类中的其他元素，在这种情况下，就是 Activity 类。当然，它会失败。你不能序列化一个 Activity 类，有这么多不可序列化的成员和实例，如果你这样做，就不可能让它工作。

就这样。

package tt.tt;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.StreamCorruptedException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class Test extends Activity implements OnClickListener {

    List<Format> formats = new ArrayList<Format>();
    TableRow row;
    TableLayout layout;

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.make:
                make();
                break;
            case R.id.retrieve:
                retrieve();
                break;
        }
    }

    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        setContentView(R.layout.table);
        layout = (TableLayout) this.findViewById(R.id.table);
        Button make = (Button) this.findViewById(R.id.make);
        make.setOnClickListener(this);
        Button retrieve = (Button) this.findViewById(R.id.retrieve);
        retrieve.setOnClickListener(this);
    }

    public void make() {
        Random r = new Random();
        Format f = new Format();
        f.position = r.nextInt(10);
        f.name = r.toString();
        f.points = r.nextLong();
        formats.add(f);

        FileOutputStream out;
        try {
            out = this.openFileOutput("format", Activity.MODE_PRIVATE);
            ObjectOutputStream output = new ObjectOutputStream(new BufferedOutputStream(out));
            output.writeObject(formats);
            output.flush();
            output.close();
        }
        catch (FileNotFoundException e) {
            Log.d("Format", "Can't save data", e);
        }
        catch (IOException e) {
            Log.d("Format", "Can't save data", e);
        }
    }

    public void retrieve() {
        formats.clear();
        FileInputStream in;
        try {
            in = this.openFileInput("format");
            ObjectInputStream input = new ObjectInputStream(new BufferedInputStream(in));
            formats = (ArrayList<Format>) input.readObject();
            input.close();
        }
        catch (FileNotFoundException e) {
            Log.d("Format", "Can't load data", e);
        }
        catch (StreamCorruptedException e) {
            Log.d("Format", "Can't load data", e);
        }
        catch (IOException e) {
            Log.d("Format", "Can't load data", e);
        }
        catch (ClassNotFoundException e) {
            Log.d("Format", "Can't load data", e);
        }
        int count = 0;
        while (count < formats.size()) {
            Format f = formats.get(count);
            row = new TableRow(this);
            TextView temp = new TextView(this);
            TableRow.LayoutParams params = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 1f);
            temp.setText(Integer.toString(f.position));
            row.addView(temp, 0, params);
            temp = new TextView(this);
            temp.setText(f.name);
            row.addView(temp, 1, params);
            temp = new TextView(this);
            temp.setText(Long.toString(f.points));
            row.addView(temp, 2, params);
            layout.addView(row);
            count++;
        }
    }
}

和格式类：

package tt.tt;

import java.io.Serializable;

public class Format implements Serializable {
    private static final long serialVersionUID = 1L;
    public String name;
    public long points;
    public int position;

    @Override
    public String toString() {
        return new StringBuilder().append(Integer.toString(position)).append("    ").append(name).append("     ").append(points).toString();
    }
}
于 2012-09-22T13:54:56.797 回答