擷取螢幕解析度，透過 getResource()

透過 getResource()方法傳回一個Resource 物件，再用Resource 物件中的getDisplayMetrics()
傳回DisplayMetrics(

package com.example.mygraphics;

import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
private TextView tv;
private Resources res;
DisplayMetrics metrics;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.tv);
res=getResources();
metrics=res.getDisplayMetrics();
}

@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
tv.setText("寬"+metrics.widthPixels+"\n");
tv.append("長"+metrics.heightPixels+"\n");
tv.append("DPI"+metrics.densityDpi);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}

使用Bundle 傳遞參數

本程式使用Bundle物件，由main_activity傳遞參數到result:

首先設計一個 main_activity.xml

包含兩個Radiobutton、一個EditText、以及一個Button

<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:orientation="vertical"

    tools:context=".MainActivity" >

  

<LinearLayout 

    android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

    >

    <RadioButton  

         android:id="@+id/rb1"

         android:layout_height="wrap_content"

         android:layout_width="wrap_content"

         android:text="男生"

        />

      <RadioButton  

         android:id="@+id/rb2"

         android:layout_height="wrap_content"

         android:layout_width="wrap_content"

         android:text="女生"

        />

       <EditText 

           android:id="@+id/et"

           android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:text="0"

            /> 

        </LinearLayout>

      <Button

           android:id="@+id/bt1"

           android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:text="Submit"

         />

      <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"               

        android:text="@string/hello_world" />

  

    

</LinearLayout>

目的地Result.xml 包含一個textview，id 為Textview

MainActivity.java 程式碼:

package com.example.p0123;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.RadioButton;

import android.widget.TextView;

public class MainActivity extends Activity {

 private Button bt1;

 private EditText et1;

 private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

bt1=(Button)findViewById(R.id.bt1);

et1=(EditText)findViewById(R.id.et);

tv=(TextView)findViewById(R.id.tv);

// if (et1.getText().toString().length()>0)

// tv.setText(" "+age);

// else 

// age=1;

bt1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

 Integer age=0;

String sex="";

RadioButton rb1=(RadioButton)findViewById(R.id.rb1);

RadioButton rb2=(RadioButton)findViewById(R.id.rb2);

if (rb1.isChecked())

{

sex="M";

}else {sex="F";}

// tv.setText(sex);

// age=100;

age=Integer.parseInt(et1.getText().toString());

Intent intent =new Intent();

intent.setClass(MainActivity.this, Resultform.class);

Bundle bundle=new Bundle();

bundle.putInt("age", age);

bundle.putString("sex", sex);

intent.putExtras(bundle);

startActivity(intent);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.activity_main, menu);

return true;

}

}

Result.java

package com.example.p0123;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class Resultform extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.result);

TextView tv=(TextView)findViewById(R.id.tv);

Bundle bundle=this.getIntent().getExtras();

Integer age=bundle.getInt("age");

String sex=bundle.getString("sex");

tv.setText(sex+":"+age);

}

}

結果如下

Google Map

這是一個在Web 中呈現地圖的範例，

<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />

<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=true"></script>

<script  type="text/javascript" >
function  initialize()
{
var latlng = new google.maps.LatLng(24.061669,120.429468);
var myOptions = {
     zoom: 8,
     center: latlng,
     mapTypeId: google.maps.MapTypeId.ROADMAP
   };
var map=new google.maps.Map(document.getElementById("map_canvas"),myOptions);


}
</script>

</head>
<body onload="initialize()">
<div id="map_canvas" style="width: 100% ;height: 100%"></div>
</body>

</html>

Android 簡單對話框 AlertDilaog 應用 (1)

package com.example.mydialog1;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private Button click1;
private TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
click1=(Button) findViewById(R.id.click1);
click1.setOnClickListener(new OnClickListener()
       {

@Overrid
        public void onClick(View v) {
// TODO Auto-generated method stub
showDialog();
}
});

}

private void showDialog()
{
AlertDialog dialog1;
AlertDialog.Builder builder=new  AlertDialog.Builder(this);
builder.setTitle("請選擇");
builder.setMessage("Delete");
builder.setCancelable(false);

// 選擇回答yes
builder.setPositiveButton("yes", new  DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "Yes", Toast.LENGTH_SHORT).show();
}
});

//選擇回答No
builder.setNegativeButton("no", new   DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "No", Toast.LENGTH_LONG).show();
}
});
dialog1=builder.create();
dialog1.show();
}





@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}