疯狂安卓书籍的学习--未完待续~

疯狂安卓书籍的学习

如何自定义view

先建一个view类 重写ondraw方法

public class DrawView extends View {
public float currentX = 40;
public float currentY = 50;
// 定义并创建画笔
Paint paint = new Paint();

public DrawView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

public DrawView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//设置画笔的颜色
paint.setColor(Color.GREEN);
canvas.drawCircle(currentX, currentY, 15, paint);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
currentX=event.getX();
currentY=event.getY();
invalidate();//重新绘制
//表名 该处理方法已经处理
return true;
}
}
再在activity中将view类添加进去
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RelativeLayout view=(RelativeLayout) findViewById(R.id.root);
DrawView drawView=new DrawView(this);
view.addView(drawView);
}

也可以直接在布局文件中添加这个自定义控件

<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"
android:id="@+id/root"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.android.MainActivity" >

<com.example.android.DrawView
android:id="@+id/diydraw"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

</RelativeLayout>

效果如下

计算器

布局文件如下

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:rowCount="6"
android:columnCount="4"
android:id="@+id/root"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_columnSpan="4"
android:textSize="50dp"
android:layout_marginLeft="2pt"
android:layout_marginRight="2pt"
android:layout_gravity="right"
android:text="0"/>
<Button android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_columnSpan="4"
android:text="清除"/>

</GridLayout>

activity文件如下

public class MainActivity extends Activity {
GridLayout girdlayout;
String[] omg = { "1", "2", "3", "/", "4", "5", "6", "*", "7", "8", "9", "-", ".", "0", "=", "+", };

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.caculator);
girdlayout = (GridLayout) findViewById(R.id.root);
for (int i = 0; i < omg.length; i++) {
Button button = new Button(this);
button.setText(omg[i]);
button.setTextSize(40);
button.setPadding(5, 35, 5, 35);
//指定该组件所在列
GridLayout.Spec rowSpec=GridLayout.spec(i/4+2);
GridLayout.Spec columnSpec=GridLayout.spec(i%4);
GridLayout.LayoutParams params=new GridLayout.LayoutParams(rowSpec, columnSpec);
params.setGravity(Gravity.FILL);
girdlayout.addView(button, params);
}
}

}

效果如图

智能填充

布局文件

<LinearLayout 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"
android:id="@+id/root"
android:orientation="vertical"
>
<AutoCompleteTextView
android:id="@+id/auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
/>
<MultiAutoCompleteTextView
android:id="@+id/mauto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
/>
</LinearLayout>

代码

public class zidongtianchong extends Activity {
AutoCompleteTextView act;
MultiAutoCompleteTextView mact;
String[] omg = new String[] { "1", "12", "123", "1234", };

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.simple_dropdown_item_1line, omg);
act=(AutoCompleteTextView) findViewById(R.id.auto);
act.setAdapter(adapter);
mact=(MultiAutoCompleteTextView) findViewById(R.id.mauto);
mact.setAdapter(adapter);
//设置分割符
mact.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}

}

效果如下：



补充：

requestWindowFeatrue（window.Featrue_Progress）;

设置标题栏为progressbar；

拖动栏SeekBar的监听方法