技术标签: android studio
本文只是记录一些零碎的东西
开发中弹窗是使用很频繁的一个类,一般使用AlertDialog 如下
AlertDialog alertDialog = new AlertDialog.Builder(getActivity())
.setMessage("需要开启网络,强烈建议开启GPS,是否开启?")
.setPositiveButton("开启", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// 转到手机设置界面
startActivityForResult(new Intent(
Settings.ACTION_SETTINGS), 0);
}
}).setNegativeButton("取消", null).create();
google 早就提供了DialogFragment,今天过来学习下
API : https://developer.android.com/reference/android/support/v4/app/DialogFragment.html
看一下API ,就会发现其实就是一个Fragment,用法没有任何改变,通过自定义,可以自定义出ConfirmDialogFragment,ProgressDialogFragment等等,看我小试牛刀
有和Fragment基本一致的生命周期,因此便于Activity更好的控制管理DialogFragment。 随屏幕旋转(横竖屏幕切换)DialogFragment对话框随之自动调整对话框大小。而AlertDialog和PopupWindow随屏幕切换而消失。 DialogFragment的出现解决 横竖屏幕切换Dialog消失的问题。
看看MyDialogFragment代码,有Dialog回传值
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.EditText;
import android.widget.TextView;
// https://developer.android.com/reference/android/app/DialogFragment.html
public class MyDialogFragment extends DialogFragment {
int mNum = 0;
private EditText editText;
private MainActivity ac;
/**
* 通过newInstance()创建实例,并返回,这里的处理和系统从save状态中re-create相同。 1、通过 显示的标题,信息,显示类型
* 构造函数创建对象 2、将传递的信息设置为fragment的参数 3、返回对象
*/
static MyDialogFragment newInstance(String title, String message, int style) {
MyDialogFragment f = new MyDialogFragment();
Bundle args = new Bundle();
args.putString("alert_title", title);
args.putString("alert_message", message);
args.putInt("alert_style", style);
f.setArguments(args);
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments().getInt("alert_style");
int style = 0;
switch (mNum) {
case 0:
style = DialogFragment.STYLE_NORMAL;// 默认样式
break;
case 1:
style = DialogFragment.STYLE_NO_TITLE;// 无标题样式
break;
case 2:
style = DialogFragment.STYLE_NO_FRAME;// 无边框样式
break;
case 3:
style = DialogFragment.STYLE_NO_INPUT;// 不可输入,不可获得焦点样式
break;
}
setStyle(style, 0);//设置样式
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getDialog().setTitle(getArguments().getString("alert_title"));//添加标题
// getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题
View view = inflater.inflate(R.layout.fragment_dialog, container, false);
((TextView)view.findViewById(R.id.alert_message)).setText(getArguments().getString("alert_message") );
editText = (EditText) view.findViewById(R.id.alert_input);
ac = (MainActivity)getActivity();
view.findViewById(R.id.alert_ok).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// When button is clicked, call up to owning activity.
// ((FragmentDialog) getActivity()).showDialog();
if(!TextUtils.isEmpty(editText.getText())){
ac.showDialogMessage(editText.getText().toString());
}
dismiss();
}
});
view.findViewById(R.id.alert_cancle).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
dismiss();
}
});
return view;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:orientation="vertical" >
<TextView
android:id="@+id/alert_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="dialog fragment" />
<TextView
android:id="@+id/alert_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="dialog fragment message"
android:textSize="20dp" />
<EditText
android:id="@+id/alert_input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:inputType="text" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp" >
<TextView
android:id="@+id/alert_ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="确定" />
<TextView
android:id="@+id/alert_cancle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="取消" />
</LinearLayout>
</LinearLayout>
再看看怎么调用的
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void showDia(View view){
// DialogFragment.show() will take care of adding the fragment
// in a transaction. We also want to remove any currently showing
// dialog, so make our own transaction and take care of that here.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
Fragment prev = getSupportFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
ft.remove(prev);
Log.i("slack", "prev != null");
}
ft.addToBackStack(null);
// Create and show the dialog.
MyDialogFragment newFragment = MyDialogFragment.newInstance("title","message",0);
newFragment.show(ft, "dialog");
}
public void showDialogMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).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.main, menu);
return true;
}
}
使用这个,如果再封装一下,可以整个项目的弹窗都使用
DialogFragment,官方API里还提供了AlertDialog的组合使用,直接看官方的源码
public static class MyAlertDialogFragment extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
int title = getArguments().getInt("title");
return new AlertDialog.Builder(getActivity())
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(title)
.setPositiveButton(R.string.alert_dialog_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doPositiveClick();
}
}
)
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doNegativeClick();
}
}
)
.create();
}
}
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