package example.jay.com.activitytest1;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
public class MyActivity extends ActionBarActivity {
private Button btnregister;
private EditText editname;
private RadioGroup rad;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
btnregister = (Button)findViewById(R.id.btnregister);
editname = (EditText)findViewById(R.id.editname);
rad = (RadioGroup)findViewById(R.id.radioGroup);
btnregister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name,sex = "";
Intent it = new Intent(MyActivity.this,MyActivity2.class);
name = editname.getText().toString();
//遍历RadioGroup找出被选中的单选按钮
for(int i = 0;i < rad.getChildCount();i++)
{
RadioButton rd = (RadioButton)rad.getChildAt(i);
if(rd.isChecked())
{
sex = rd.getText().toString();
break;
}
}
//新建Bundle对象,并把数据写入
Bundle bd = new Bundle();
bd.putCharSequence("user",name);
bd.putCharSequence("sex",sex);
//将数据包Bundle绑定到Intent上
it.putExtras(bd);
startActivity(it);
//关闭第一个Activity
finish();
}
});
}
}
package example.jay.com.activitytest1;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MyActivity2 extends ActionBarActivity {
private TextView txtshow;
private String name;
private String sex;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_activity2);
txtshow = (TextView)findViewById(R.id.txtshow);
//获得Intent对象,并且用Bundle出去里面的数据
Intent it = getIntent();
Bundle bd = it.getExtras();
//按键值的方式取出Bundle中的数据
name = bd.getCharSequence("user").toString();
sex = bd.getCharSequence("sex").toString();
txtshow.setText("尊敬的"+name + " " + sex + "士"+"恭喜你,注册成功~");
}
}
2.多个Activity间的交互(后一个传回给前一个)
具体代码如下：
public class ActivityCollector {
public static LinkedList<Activity> activities = new LinkedList<Activity>();
public static void addActivity(Activity activity)
{
activities.add(activity);
}
public static void removeActivity(Activity activity)
{
activities.remove(activity);
}
public static void finishAll()
{
for(Activity activity:activities)
{
if(!activity.isFinishing())
{
activity.finish();
}
}
}
}
5.完全退出App的方法
上面说的是关闭所有Activity的，但是有些时候我们可能想杀死整个App，连后台任务都杀死 杀得一干二净的话，可以使用搭配着下述代码使用：
实现代码：
/**
* 退出应用程序
*/
public void AppExit(Context context) {
try {
ActivityCollector.finishAll();
ActivityManager activityMgr = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
activityMgr.killBackgroundProcesses(context.getPackageName());
System.exit(0);
} catch (Exception ignored) {}
}
6.双击退出程序的两种方法：
1）定义一个变量，来标识是否退出
// 定义一个变量，来标识是否退出
private static boolean isExit = false;
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
isExit = false;
}
};
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (!isExit) {
isExit = true;
Toast.makeText(getApplicationContext(), "再按一次退出程序",
Toast.LENGTH_SHORT).show();
// 利用handler延迟发送更改状态信息
mHandler.sendEmptyMessageDelayed(0, 2000);
} else {
exit(this);
}
return false;
}
return super.onKeyDown(keyCode, event);}
2）保存点击时间：
//保存点击的时间
private long exitTime = 0;
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if ((System.currentTimeMillis() - exitTime) > 2000) {
Toast.makeText(getApplicationContext(), "再按一次退出程序",
Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
exit();
}
return false;
}
return super.onKeyDown(keyCode, event);
}
2）方法二：
通过style进行配置，这个是全局的哦，就是所有的Activity都会加载这个动画！
实现代码如下：
①在style.xml中自定义style：
<!-- 默认Activity跳转动画 -->
<style name="default_animation" mce_bogus="1" parent="@android:style/Animation.Activity">
<item name="android:activityOpenEnterAnimation">@anim/default_anim_in</item>
<item name="android:activityOpenExitAnimation">@anim/anim_stay</item>
<item name="android:activityCloseEnterAnimation">@anim/anim_stay</item>
<item name="android:activityCloseExitAnimation">@anim/default_anim_out</item>
</style>
解释：
4个item分别代表:
Activity A跳转到Activity B时Activity B进入动画;
Activity A跳转到Activity B时Activity A退出动画;
Activity B返回Activity A时Activity A的进入动画
Activity B返回Activity A时ActivityB的退出动画
②然后修改下AppTheme:
<style name="AppTheme" mce_bogus="1" parent="@android:style/Theme.Light">
<item name="android:windowAnimationStyle">@style/default_animation</item>
<item name="android:windowNoTitle">true</item>
</style>
③最后在appliction设置下：
<application
android:icon="@drawable/logo"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
10.设置Activity全屏的方法：
1）代码隐藏ActionBar
在Activity的onCreate方法中调用getActionBar.hide();即可
2）通过requestWindowFeature设置
requestWindowFeature(Window.FEATURE_NO_TITLE); 该代码需要在setContentView ()之前调用，不然会报错
3）通过AndroidManifest.xml的theme
在需要全屏的Activity的标签内设置 theme = @android:style/Theme.NoTitleBar.FullScreen
11.onWindowFocusChanged方法妙用：
我们先来看下官方对这个方法的介绍：
12.定义对话框风格的Activity
直接设置下Activity的theme:
android:theme="@android:style/Theme.Dialog"这样就可以了，当然你可以再设置下标题，小图标！
//设置左上角小图标
requestWindowFeature(Window.FEATURE_LEFT_ICON);
setContentView(R.layout.main);
getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, android.R.drawable.ic_lion_icon);
//设置文字:
setTitle(R.string.actdialog_title); //XML代码中设置:android:label="@string/activity_dialog"