android编程常见模块

1.验证密码

mButton01.setOnClickListener(new mClick());

}

class mClick implements OnClickListener //定义一个类实现监听接口

{

public void onClick(View v)

{

String passwd;

passwd=edit.getText().toString();

if(passwd.equals("abc123"))

txt2.setText("欢迎进入快乐大本营!");

else

txt2.setText("非法用户,请立刻离开!");

}

}

2.使用imageview

ImageView imageview;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

imageview = (ImageView) this.findViewById(R.id.mImageView);

imageview.setImageResource(R.drawable.img);

}

3.进度条控件

public class Ex03_10Activity extends Activity {

ProgressBar progressBar;

Button btn1, btn2;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

progressBar = (ProgressBar)findViewById(R.id.progressBar1);

btn1 = (Button)findViewById(R.id.button1);

btn2 = (Button)findViewById(R.id.button2);

btn1.setOnClickListener(new mClick1());

btn2.setOnClickListener(new mClick2());

}

class mClick1 implements OnClickListener

{

public void onClick(View v) {

progressBar.incrementProgressBy(5);

}

}

class mClick2 implements OnClickListener

{

public void onClick(View v) {

progressBar.incrementProgressBy(-5);

}

}

}

4.checkbox

public class Ex03_11Activity extends Activity {

CheckBox ch1, ch2, ch3;

Button okBtn;

TextView txt;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

ch1 = (CheckBox)findViewById(R.id.checkBox1);

ch2 = (CheckBox)findViewById(R.id.checkBox2);

ch3 = (CheckBox)findViewById(R.id.checkBox3);

okBtn=(Button)findViewById(R.id.button1);

txt=(TextView)findViewById(R.id.textView2);

okBtn.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

public void onClick(View v)

{

String str="";

if(ch1.isChecked()) str=str+"\n"+ch1.getText();

if(ch2.isChecked()) str=str+"\n"+ch2.getText();

if(ch3.isChecked()) str=str+"\n"+ch3.getText();

txt.setText("您选择了："+str);

}

}

}

5.toast

toast = Toast.makeText(MainActivity.this, //getApplicationContext(),

"自定义Toast的位置",

Toast.LENGTH_SHORT);

toast.setGravity(Gravity.CENTER, 0, 0);

toast.show();

6.为多个按钮绑定事件

//为Button注册事件监听器

btn1.setOnClickListener(new mItemClick());

btn2.setOnClickListener(new mItemClick());

btn3.setOnClickListener(new mItemClick());

}

//定义列表选项监听器

class mItemClick implements OnClickListener

{

Toast toast;

LinearLayout toastView;

ImageView imageCodeProject;

@Override

public void onClick(View v)

{

if(v==btn1)

{

Toast.makeText(getApplicationContext(),

"默认Toast样式",

Toast.LENGTH_SHORT).show();

}

else if(v==btn2)

{

toast = Toast.makeText(MainActivity.this, //getApplicationContext(),

"自定义Toast的位置",

Toast.LENGTH_SHORT);

toast.setGravity(Gravity.CENTER, 0, 0);

toast.show();

}

else if(v==btn3)

{

toast = Toast.makeText(MainActivity.this,

"带图标的Toast",

Toast.LENGTH_SHORT);

toast.setGravity(Gravity.CENTER, 0, 80);

toastView = (LinearLayout) toast.getView();

imageCodeProject = new ImageView(MainActivity.this);

imageCodeProject.setImageResource(R.drawable.icon);

toastView.addView(imageCodeProject, 0);

toast.show();

}

}

}

7.页面跳转

class MainActivity

btn.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

@Override

public void onClick(View v)

{

Intent intent = new Intent(MainActivity.this, Second.class);

startActivity(intent);btn.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

@Override

public void onClick(View v)

{

Intent intent = new Intent(MainActivity.this, Second.class);

startActivity(intent);

}

}

8.页面之间传递数据

mainactivity

btn1.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

@Override

public void onClick(View v)

{

Intent intent = new Intent();

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

Bundle bundle = new Bundle();

bundle.putString("text", txt.getText().toString());

intent.putExtras(bundle);

startActivity(intent);

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

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

return true;

}

secondActivity

Bundle bundle2 = this.getIntent().getExtras();

String str = bundle2.getString("text");

txt2.setText(str);

btn2.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

@Override

public void onClick(View v)

{

Intent intent2 = new Intent();

intent2.setClass(secondActivity.this, MainActivity.class);

startActivityForResult(intent2, 0);

}

}

9.使用菜单

public class MainActivity extends Activity

{

TextView txt;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

txt = (TextView)findViewById(R.id.textView1);

}

@Override

public boolean onCreateOptionsMenu(Menu menu)

{

super.onCreateOptionsMenu(menu);//调用父类方法

//下面添加菜单项

menu.add(1, 1, 1, "菜单项1");

menu.add(1, 2, 2, "菜单项2");

menu.add(1, 3, 3, "菜单项3");

menu.add(1, 4, 4, "菜单项4");

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

return true;

}

//下面定义响应菜单项的事件

public boolean onOptionsItemSelected(MenuItem item)

{

String title = item.getTitle().toString();

switch(item.getItemId())

{

case 1:

txt.setText(title);

break;

case 2:

txt.setText(title);

break;

case 3:

txt.setText(title);

break;

case 4:

txt.setText(title);

break;

default:

return super.onOptionsItemSelected(item);

}

return true;

}

}

10，上下文菜单

public class Ex04_04Activity extends Activity

{

TextView txt1, txt2, txt3;

private static final int item1 = Menu.FIRST;

private static final int item2 = Menu.FIRST+1;

private static final int item3 = Menu.FIRST+2;

String str[] = {"令狐冲", "杨 过", "萧 峰 " };

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

txt1=(TextView)findViewById(R.id.text1);

txt2=(TextView)findViewById(R.id.text2);

txt3=(TextView)findViewById(R.id.text3);

txt1.setText(str[0].toString());

txt2.setText(str[1].toString());

txt3.setText(str[2].toString());

registerForContextMenu(txt1);

registerForContextMenu(txt2);

registerForContextMenu(txt3);

}

//上下文菜单，本例会通过长按条目激活上下文菜单

@Override

public void onCreateContextMenu(ContextMenu menu, View view,

ContextMenuInfo menuInfo) {

menu.setHeaderTitle("人物简介");

//添加菜单项

menu.add(0, item1, 0, "武功");

menu.add(0, item2, 0, "战斗力");

menu.add(0, item3, 0, "经典语录");

}

//菜单单击响应

@Override

public boolean onContextItemSelected(MenuItem item){

//获取当前被选择的菜单项的信息

switch(item.getItemId())

{

case item1:

//在这里添加处理代码

break;

case item2:

//在这里添加处理代码

break;

case item3:

//在这里添加处理代码

break;

}

return true;

}

}

11.handler传递消息

public class MainActivity extends Activity

{

int i = 80, j = 10, step;

vView view;

Button btn;

Handler handler;

mThread thread;

private boolean STOP = true; //线程是否停止标志位

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btn=(Button)findViewById(R.id.btn1);

btn.setOnClickListener(new mClick());

}

class mClick implements OnClickListener

{

@Override

public void onClick(View arg0)

{

thread = new mThread("abc");

handler = new mHandler();

STOP = false;//设置线程中循环的标志位

//开启新的线程

thread.start();

}

}

private class vView extends View

{

int x, y;

public vView(Context context, int x1, int y1)

{

super(context);

x=x1;

y=y1;

}

protected void onDraw(Canvas canvas)

{

super.onDraw(canvas);

canvas.drawColor(Color.CYAN);//设置背景色为白色

Paint paint = new Paint();

paint.setColor(Color.BLACK);

paint.setAntiAlias(true);

canvas.drawCircle(x, y, 15, paint);//参数为坐标（x，y）、半径r、画笔

paint.setColor(Color.WHITE);

canvas.drawCircle(x-6, y-6, 3, paint);

}

}

//自定义的Handler类

private class mHandler extends Handler

{

public void handleMessage (Message msg)

{

switch(msg.what)

{

case 1:

{

step = step + 5;

//i = i + step;

j = j + step;

if(j>240) STOP = true; //设置停止线程中循环的标志位

break;

}

}

view = new vView(MainActivity.this, i, j);

setContentView(view);

}

}

//自定义的Thread类

private class mThread extends HandlerThread

{

public mThread(String name)

{

super(name);

// TODO Auto-generated constructor stub

}

@Override

//线程启动时执行这个函数

public void run()

{

//一直循环，直到标志位为“真”

while(!STOP)

{

try {

Thread.sleep(500);//延时0.5秒

} catch (InterruptedException e) {

e.printStackTrace();

}

Message msg = new Message();

//消息标志

msg.what = 1;

//发送这个消息

handler.sendMessage(msg);

}

}

}

}

12.layout转换

public class zhuanhuan extends Activity

{

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

/* 载入main.xml Layout */

setContentView(R.layout.main);

/* 以findViewById()取得Button对象，并添加onClickListener */

Button b1 = (Button) findViewById(R.id.button1);

b1.setOnClickListener(new Button.OnClickListener()

{

public void onClick(View v)

{

jumpToLayout2();

}

});

}

/* method jumpToLayout2：将layout由main.xml切换成mylayout.xml */

public void jumpToLayout2()

{

/* 将layout改成mylayout.xml */

setContentView(R.layout.mylayout);

/* 以findViewById()取得Button对象，并添加onClickListener */

Button b2 = (Button) findViewById(R.id.button2);

b2.setOnClickListener(new Button.OnClickListener()

{

public void onClick(View v)

{

jumpToLayout1();

}

});

}

/* method jumpToLayout1：将layout由mylayout.xml切换成main.xml */

public void jumpToLayout1()

{

/* 将layout改成main.xml */

setContentView(R.layout.main);

/* 以findViewById()取得Button对象，并添加onClickListener */

Button b1 = (Button) findViewById(R.id.button1);

b1.setOnClickListener(new Button.OnClickListener()

{

public void onClick(View v)

{

jumpToLayout2();

}

});

}

}

13.更新编辑框内容的变动

/*取得TextView、EditText*/

mTextView01 = (TextView)findViewById(R.id.myTextView);

mEditText01 = (EditText)findViewById(R.id.myEditText);

/*设置EditText用OnKeyListener事件来启动*/

mEditText01.setOnKeyListener(new EditText.OnKeyListener()

{

@Override

public boolean onKey(View arg0, int arg1, KeyEvent arg2)

{

// TODO Auto-generated method stub

/*设置TextView显示EditText所输入的内容*/

mTextView01.setText(mEditText01.getText());

return false;

}

});

14.ImageButton添加图片

<ImageButton

android:id="@+id/imageButton1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/ic_launcher" />

//android:src="这里是给ImageButton加一个图片做这个imagebutton的图标"

在Activity里面监听这个ImageButton时间具体代码如下：

ImageButton imageButton = (ImageButton) findViewById(R.id.imageButton1);

imageButton.setOnClickListener(this);