android开发学习——day6

  关于UI的几个插件学习

  button和textview，以及点击button利用Toast提醒，editText

private EditText editText;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button=(Button)findViewById(R.id.button);
        editText=(EditText)findViewById(R.id.edit_text);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                String inputText=editText.getText().toString();
                Toast.makeText(MainActivity.this,inputText,Toast.LENGTH_SHORT).show();
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="test.example.com.uiwidgettext.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:id="@+id/textView"
        android:textSize="24sp"
        android:textColor="#00ff00"
        android:text="This is TextView!" />


    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button"
        android:textAllCaps="false"
        android:layout_marginTop="22dp"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:hint="Type something here"
        android:maxLines="1"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

  imageview，点击button更换图片。图片必须以英文字母开头！

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button=(Button)findViewById(R.id.button);
        editText=(EditText)findViewById(R.id.edit_text);
        imageView=(ImageView)findViewById(R.id.image_view);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                String inputText=editText.getText().toString();
                Toast.makeText(MainActivity.this,inputText,Toast.LENGTH_SHORT).show();
                    imageView.setImageResource(R.drawable.p1);//图片切换
            }
        });
    }

  进度条progressbar

button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                int progress=progressbar.getProgress();
                progress=progress+10;
                progressbar.setProgress(progress);
            }
        });

<ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edit_text"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="22dp"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"/>

  AlertDialog

public void onClick(View v){
               // int progress=progressbar.getProgress();
                //progress=progress+10;
               // progressbar.setProgress(progress);
                AlertDialog.Builder dialog=new AlertDialog.Builder(MainActivity.this);
                dialog.setTitle("This is Dialog");
                dialog.setMessage("Something important");
                dialog.setCancelable(false);
                dialog.setPositiveButton("OK",new DialogInterface.OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog,int which){
                    }
                });
                dialog.setNegativeButton("Cancel",new DialogInterface.OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog,int which){
                    }
                });
                dialog.show();
            }

  progressDialog

public void onClick(View v){
                ProgressDialog progressDialog=new ProgressDialog(MainActivity.this);
                progressDialog.setTitle("This is progressDialog");
                progressDialog.setMessage("Loading...");
                progressDialog.setCancelable(true);
                progressDialog.show();
            }