Android-基本控件

MainActivity.java

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private EditText editText;
    private ImageView imageView;
    private ProgressBar progressBar;

    @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);
        imageView=(ImageView) findViewById(R.id.image_view);
        progressBar=(ProgressBar) findViewById(R.id.progress_bar);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String inputText = editText.getText().toString();
                Toast.makeText(MainActivity.this,inputText,
                        Toast.LENGTH_LONG).show();
                imageView.setImageResource(R.drawable.img_1);

                /*if(progressBar.getVisibility()==View.GONE){
                    progressBar.setVisibility(View.VISIBLE);
                }else{
                    progressBar.setVisibility(View.GONE);
                }*/
                int progress=progressBar.getProgress();
                progress+=10;
                progressBar.setProgress(progress);
            }
        });
        //普通对话框
        Button button2=(Button) findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
                dialog.setTitle("This is Dialog");
                dialog.setMessage("Something important.");
                dialog.setCancelable(false); //是否用back键关闭
                dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {//确定按钮
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                    }
                });
                dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {//取消按钮
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {

                    }
                });
                dialog.show();
            }
        });
        //带进度条的对话框
        Button button3=(Button) findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ProgressDialog progressDialog= new ProgressDialog(MainActivity.this);
                progressDialog.setTitle("This is ProgressDialog");
                progressDialog.setMessage("Loading...");
                progressDialog.setCancelable(true);
                progressDialog.show();
            }
        });
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.ldxiaofeng.android.uiwidgettest.MainActivity">

    <TextView
        android:id="@+id/text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="20sp"
        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" /> <!--禁用自动大小写转换-->

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Dialog"
        android:textAllCaps="false" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ProgressDialog"
        android:textAllCaps="false" />

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入电话号码"
        android:maxLines="2"/>

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/img_2"/>

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"/>

</LinearLayout>