UI的基本控件设计

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

<!--按钮-->
    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="button"
        android:textAllCaps="false"
        />

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
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 implements View.OnClickListener {

    private static final String TAG = "MainActivity";

    private EditText editText;

    //图片编辑
    private ImageView imageView;

    //进度条
    private ProgressBar progressBar;

    //按钮
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editText = (EditText) findViewById(R.id.edit_text);

        imageView = (ImageView) findViewById(R.id.image_view);

        progressBar = (ProgressBar) findViewById(R.id.progress_bar);

        //添加按钮点击事件
        button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(this);

//        button.setOnClickListener(new View.OnClickListener() {

        //修改图片和文本弹出框
//            @Override
//            public void onClick(View v) {
//                String inputText = editText.getText().toString();
//                Toast.makeText(MainActivity.this,inputText,Toast.LENGTH_LONG).show();
//
//                imageView.setImageResource(R.drawable.image2);
//                Log.d(TAG, "onClick:点击了按钮 ");
//            }

        //隐藏进度条
//            public void onClick(View v) {
//                String inputText = editText.getText().toString();
//                Toast.makeText(MainActivity.this,inputText,Toast.LENGTH_LONG).show();
//
//                imageView.setImageResource(R.drawable.image2);
//                Log.d(TAG, "onClick:点击了按钮 ");
//            }
//        });
    }

    //隐藏进度条
    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.button:

                //此处添加点击触发的事件
                if (progressBar.getVisibility() == View.GONE) {
                    progressBar.setVisibility(View.VISIBLE);
                } else {
                    progressBar.setVisibility(View.GONE);
                }

                break;
            default:
                break;
        }
    }
}

<!--文字输入器-->
    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="type code"
        android:maxLength="5"
        />

<!--图片-->
    <ImageView
        android:id="@+id/image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/image1"
        />

<!--进度条-->
    <!--style="?android:attr/progressBarStyleHorizontal"可以把进度条变为水平显示-->
    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"

        />

@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button:
                //进度条的加载
                int progress = progressBar.getProgress();
                progress+=10;
                progressBar.setProgress(progress);
                break;
            default:
                break;
        }
    }

@Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.button:
                /**
                 * 界面弹出对话框
                 */

                AlertDialog.Builder dialog = new AlertDialog.Builder(
                        MainActivity.this
                );

                dialog.setTitle("这是一个弹出框");
                dialog.setMessage("重要的内容哦");
                dialog.setCancelable(false);


                dialog.setPositiveButton("好的", new DialogInterface.OnClickListener()                {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                });

                dialog.setNegativeButton("取消", new DialogInterface.OnClickListener()                {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                dialog.show();
                break;
            default:
                break;
        }
    }

@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button:
                /**
                 * 进度条对话框
                 */
                ProgressDialog progressDialog = new  ProgressDialog(MainActivity.this);
                progressDialog.setTitle("进度条框");
                progressDialog.setMessage("加载中.......");
                progressDialog.setCancelable(true);
                progressDialog.show();
                break;
            default:
                break;
        }
    }