在android中,使编辑文本出现在设备的顶部和软键盘之间



我有一个带有许多ViewsStub的滚动视图布局,这些视图存根会根据用户的操作进行膨胀(显示),比如。。。。。回答第一个问题会使第二个问答字段(editText)出现

我的问题是,在回答了第一个问题并点击提交后,下一个问题会显示出来,但答案字段隐藏在软键盘下。。。用户看不到他正在键入的内容。

我想要的是,任何新显示的editText/s微调器/复选框都必须出现在屏幕顶部(动态滚动到这些视图)。

如何做到这一点??

以我的代码为例,您可以执行以下操作:使XML为:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <ScrollView
        android:id="@+id/scrlv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="#123789" >
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="#1188ff" >
            <RelativeLayout
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_below="@+id/headerlayout"
                android:background="#456789" >
                <EditText
                    android:id="@+id/etemail"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="20dp"
                    android:layout_marginRight="20dp"
                    android:layout_marginTop="40dp"
                    android:hint="Text 1"
                    android:maxLines="3" />
                <EditText
                    android:id="@+id/etpassword"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/etemail"
                    android:layout_alignRight="@+id/etemail"
                    android:layout_below="@+id/etemail"
                    android:hint="Text 2"
                    android:inputType="textPassword"
                    android:maxLines="3" />
                <EditText
                    android:id="@+id/etusername"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/etemail"
                    android:layout_alignRight="@+id/etemail"
                    android:layout_below="@+id/etpassword"
                    android:hint="Text 3"
                    android:maxLines="3" />
                <EditText
                    android:id="@+id/etphone"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/etemail"
                    android:layout_alignRight="@+id/etemail"
                    android:layout_below="@+id/etusername"
                    android:hint="Text 4"
                    android:inputType="text"
                    android:maxLines="5" />
                <CheckBox
                    android:id="@+id/chkterms"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/etemail"
                    android:layout_alignRight="@+id/etemail"
                    android:layout_below="@+id/etphone"
                    android:layout_marginTop="10dp"
                    android:text="Conditions Aplly"
                    android:textColor="@android:color/black" />
                <Button
                    android:id="@+id/btnlogin"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/chkterms"
                    android:layout_centerHorizontal="true"
                    android:layout_marginTop="10dp"
                    android:text="Login" />
            </RelativeLayout>
        </LinearLayout>
    </ScrollView>
</RelativeLayout>

然后编码:

[1] 获取设备的屏幕分辨率:高度、宽度

[2] 关注焦点更改您的EditText

[3] 在这种情况下,如果您的EditText获得焦点,则

[4] 获取EditText的底部,如果底部大于(屏幕高度/3),则为

[5] 将Your_ScrollView滚动到(左,(屏幕高度/3));

public class MainActivity extends Activity implements OnClickListener{
    private EditText etEmail, etPassword, etUserName, etPhoneNo;
    private CheckBox chkTerms;
    private Button btnLogin;
    ScrollView scrlv;
    int sw, sh, left, bottom;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scrlv = (ScrollView) findViewById(R.id.scrlv);
        etEmail = (EditText) findViewById(R.id.etemail);
        etPassword = (EditText) findViewById(R.id.etpassword);
        etUserName = (EditText) findViewById(R.id.etusername);
        etPhoneNo = (EditText) findViewById(R.id.etphone);
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        sw = dm.widthPixels;
        sh = dm.heightPixels;
        System.out.println("Screen Width = " + sw);
        System.out.println("Screen Height = " + sh);
        chkTerms = (CheckBox) findViewById(R.id.chkterms);
        btnLogin = (Button) findViewById(R.id.btnlogin);
        btnLogin.setOnClickListener(this);
        etUserName.setOnFocusChangeListener(new OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if(etUserName.hasFocus()) {
                    left = etUserName.getLeft();
                    bottom = etUserName.getTop();
                    if (bottom > sh / 3) {
                        System.out.println("Umn Left :: " + left);
                        System.out.println("Umn Bottom :: " + bottom);
                        scrlv.scrollTo(left, (sh/3));
                        left = etUserName.getLeft();
                        bottom = etUserName.getTop();
                        System.out.println("Umn Left :: " + left);
                        System.out.println("Unm Bottom :: " + bottom);
                    }
                }
            }
        });
        etPhoneNo.setOnFocusChangeListener(new OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if(etPhoneNo.hasFocus()) {
                    left = etPhoneNo.getLeft();
                    bottom = etPhoneNo.getTop();
                    if (bottom > sh / 3) {
                        System.out.println("Phno Left :: " + left);
                        System.out.println("Phno Bottom :: " + bottom);
                        scrlv.scrollTo(0, (sh/3));
                        left = etPhoneNo.getLeft();
                        bottom = etPhoneNo.getTop();
                        System.out.println("Phno Left :: " + left);
                        System.out.println("Phno Bottom :: " + bottom);
                    }
                }
            }
        });
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
    }
}

在布局中,您可以尝试以下操作:

1) 设置属性android:fillViewPort="true"

2) 将编辑文本的权重设置为"1"(假设没有其他对象的权重为1)

3) 您的滚动视图是否包含所有的文本视图/编辑文本?使用fillViewPort属性将整个布局包围在滚动视图中可能是值得的。

对于滚动视图及其复杂性来说,这是一个非常好的链接:

http://www.curious-creature.org/2010/08/15/scrollviews-handy-trick/

当软键盘显示时,使用以下布局应该向上移动底部的EditText(在某个点调用view.setVisibility(true)):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/answers" />
    <EditText
        android:id="@+id/answers"
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:layout_alignParentBottom="true"
        android:visibility="invisible"/>
</RelativeLayout>

您可以尝试requestRectangleOnScreen方法来确保您的视图可见。请参阅:http://developer.android.com/reference/android/view/View.html#requestRectangleOnScreen%28android.graphics.Rect%29

public boolean requestRectangleOnScreen (Rect rectangle)
Since: API Level 1
Request that a rectangle of this view be visible on the screen, scrolling if necessary just enough.
A View should call this if it maintains some notion of which part of its content is interesting. For example, a text editing view should call this when its cursor moves.
Parameters
rectangle   The rectangle.
Returns
    Whether any parent scrolled. 

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