Android(安卓)Studio入门小例子

界面

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

MainActivity.java

package com.example.zzyy.myapplication20161216;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.TextView;public class MainActivity extends AppCompatActivity {    private TextView showView = null;    private EditText edit = null;    private Button but = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        this.but = (Button)super.findViewById(R.id.mybut);        this.showView = (TextView)super.findViewById(R.id.mytext);        this.edit = (EditText)super.findViewById(R.id.myed);        this.edit.setOnClickListener(new OnClickListenerImpl());        this.edit.setOnFocusChangeListener(new OnFocusChangeListenerImpl());        but.setOnClickListener(new ShowLIstener());    }    private class OnFocusChangeListenerImpl implements View.OnFocusChangeListener{        @Override        public void onFocusChange(View v, boolean hasFocus) {            if(v.getId()==MainActivity.this.edit.getId()){                if(hasFocus){                    MainActivity.this.showView.setText("文本输入 组件获得焦点。");                }else{                    if(MainActivity.this.edit.getText().length()>0){                    }else{                        MainActivity.this.showView.setText("文本输入组件失去焦点,输入内容不能为空");                    }                }            }         }    }    private class OnClickListenerImpl implements View.OnClickListener{        public void onClick(View v) {            MainActivity.this.edit.setText("");        }    }    private class ShowLIstener implements View.OnClickListener{        public  void onClick(View view){            String info = edit.getText().toString();            showView.setText("输入的内容是:"+info);        }    }}

效果图

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