Android 应用框架原理与程序设计36技 10.4.2 里的VIEW完全弄不出来，求指点

[afairycell]

--ac01.java
package com.example.kx04;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class ac01 extends Activity implements OnClickListener {
private final int WC = ViewGroup.LayoutParams.WRAP_CONTENT;
private LinearLayout layout;
private GraphicView gv;

@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(200,
300);
param.leftMargin = 1;
gv = new GraphicView(this);
layout.addView(gv, param);
Button btn = new Button(this);
btn.setText("Exit");
btn.setOnClickListener(this);
param = new LinearLayout.LayoutParams(WC, WC);
param.leftMargin = 10;
layout.addView(btn, param);
gv.build_model();
gv.requestFocus();
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent msg) {
if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN)
gv.MoveDown();
if (keyCode == KeyEvent.KEYCODE_DPAD_UP)
gv.MoveUp();
if (keyCode == KeyEvent.KEYCODE_Z)
gv.zip_toggle();
return true;
}

public void onClick(View arg0) {
finish();
}
}

[afairycell]

我找出是啥脑残的问题了，我只能CAO了，坑。。。这书太坑了，等人找到问题拿分啦，其实太简单了

[MaxCrazy]

没有setContentView(layout); ,所以不显示VIEW

[afairycell]

--GraphicView package com.example.kx04; import java.util.ArrayList; import java.util.HashMap; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.View; public class GraphicView extends View { private Paint paint = new Paint(); private ObjectMap root, next_node, curr_item, pa; private MapList show_list, lv_0_coll, lv_1_coll, lv_2_coll; private int base, x, y, target_index, acc_index; private class MapList extends ArrayList<ObjectMap> { private static final long serialVersionUID = 1L; } private class ObjectMap extends HashMap<String, Object> { private static final long serialVersionUID = 1L; public void put_object(String key, Object value) { super.put(key, value); } public void put_string(String key, String value) { super.put(key, value); } public MapList get_sons() { return (MapList) super.get("sons"); } } GraphicView(Context context) { super(context); target_index = 0; base = 0; root = getNewNode(null, "goal"); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.BLUE); y = base + 6; acc_index = 0; show_list = new MapList(); this.drawNode_recursive(root, canvas); } private void drawNode_recursive(ObjectMap curr_node, Canvas canvas) { String level = curr_node.get("level").toString(); int k = Integer.valueOf(level); x = k * 10 + 2; MapList son_coll = curr_node.get_sons(); int sz = son_coll.size(); String plus = "+"; // zip if (sz == 0) { plus = "-"; show_list.add(curr_node); this.drawNode(x, y, curr_node, plus, canvas); if (pa != null) pa.put_object("last_pos", new Integer(y)); curr_node.put_object("last_pos", new Integer(y + 6)); return; } else { plus = curr_node.get("zip").toString(); if (plus == "+") { show_list.add(curr_node); this.drawNode(x, y, curr_node, plus, canvas); pa = (ObjectMap) curr_node.get("parent"); if (pa != null) pa.put_object("last_pos", new Integer(y)); curr_node.put_object("last_pos", new Integer(y + 6)); return; } show_list.add(curr_node); this.drawNode(x, y, curr_node, plus, canvas); pa = (ObjectMap) curr_node.get("parent"); if (pa != null) pa.put("last_pos", new Integer(y)); curr_node.put_object("last_pos", new Integer(y + 6)); for (int i = 0; i < sz; i++) { next_node = (ObjectMap) son_coll.get(i); y = y + 15; this.drawNode_recursive(next_node, canvas); } } } private void drawNode(int x, int y, ObjectMap curr_node, String plus, Canvas canvas) { String tx = curr_node.get("name").toString(); paint.setAntiAlias(true); if (x != 2) { paint.setColor(Color.DKGRAY); canvas.drawLine(x - 5, y + 5, x, y + 5, paint); pa = (ObjectMap) curr_node.get("parent"); Integer last_pos = (Integer) pa.get("last_pos"); int last_y = last_pos; canvas.drawLine(x - 5, last_y + 4, x - 5, y + 5, paint); } paint.setColor(Color.BLACK); paint.setStrokeWidth(1); paint.setColor(Color.LTGRAY); canvas.drawRect(x, y, x + 10, y + 10, paint); paint.setColor(Color.BLUE); canvas.drawLine(x + 2, y + 5, x + 8, y + 5, paint); if (plus == "+") canvas.drawLine(x + 5, y + 2, x + 5, y + 8, paint); if (plus == "@") canvas.drawRect(x + 2, y + 2, x + 8, y + 8, paint); String level = curr_node.get("level").toString(); int k = Integer.valueOf(level); switch (k) { case 0: paint.setColor(Color.BLACK); break; case 1: paint.setColor(Color.BLUE); break; case 2: paint.setColor(Color.BLACK); break; case 3: paint.setColor(Color.BLUE); break; } if (target_index == acc_index) paint.setColor(Color.RED); canvas.drawText(tx, x + 13, y + 8, paint); acc_index++; } public void build_model() { root = getNewNode(null, "goal"); lv_0_coll = root.get_sons(); curr_item = getNewNode(root, "money"); lv_0_coll.add(curr_item); lv_1_coll = curr_item.get_sons(); lv_1_coll.add(getNewNode(curr_item, "salary")); lv_1_coll.add(getNewNode(curr_item, "bonus")); lv_1_coll.add(getNewNode(curr_item, "extra_bonus")); curr_item.put_string("zip", "@"); curr_item = getNewNode(root, "thing"); lv_0_coll.add(curr_item); lv_1_coll = curr_item.get_sons(); next_node = getNewNode(curr_item, "few"); lv_1_coll.add(next_node); lv_2_coll = next_node.get_sons(); lv_2_coll.add(getNewNode(next_node, "little")); lv_2_coll.add(getNewNode(next_node, "fewer")); next_node.put("zip", "+"); lv_1_coll.add(getNewNode(curr_item, "middle")); lv_1_coll.add(getNewNode(curr_item, "busy")); curr_item.put_string("zip", "@"); curr_item = getNewNode(root, "long"); lv_0_coll.add(curr_item); lv_1_coll = curr_item.get_sons(); lv_1_coll.add(getNewNode(curr_item, "short")); lv_1_coll.add(getNewNode(curr_item, "middle")); lv_1_coll.add(getNewNode(curr_item, "long")); curr_item.put_string("zip", "@"); root.put_string("zip", "@"); } private ObjectMap getNewNode(ObjectMap pa, String name) { String lv = null; String level = null; if (pa == null) level = "0"; else { lv = pa.get("level").toString(); level = String.valueOf(Integer.valueOf(lv) + 1); } ObjectMap m_obj = new ObjectMap(); m_obj.put_object("last_pos", new Integer(18)); m_obj.put_string("level", level); m_obj.put_string("name", name); m_obj.put_object("parent", pa); m_obj.put_object("sons", new MapList()); m_obj.put_string("zip", "+"); return m_obj; } public void MoveUp() { target_index--; this.invalidate(); } public void MoveDown() { target_index++; this.invalidate(); } public void zip_toggle() { ObjectMap curr_node = show_list.get(target_index); String zz = curr_node.get("zip").toString(); if (zz == "@") { curr_node.put_string("zip", "+"); this.invalidate(); } if (zz == "+") { curr_node.put_string("zip", "@"); this.invalidate(); } } }

[afairycell]

--AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:my="http://schemas.android.com/apk/res/com.example.kx04.GraphicView" package="com.example.kx04" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <com.example.kx04.GraphicView android:layout_width="wrap_content" android:layout_height="wrap_content" /> <activity android:name="com.example.kx04.MainActivity" android:label="@string/app_name" > </activity> <activity android:name="ac01" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>