Android开发中button按钮的使用及动态添加组件方法示例

2023-09-20 15:13:05 62

packagecom.example.lab2; importandroid.os.Bundle; importandroid.app.Activity; importandroid.content.Context; importandroid.view.Menu; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.view.View.OnLongClickListener; importandroid.widget.Button; importandroid.widget.EditText; importandroid.widget.ImageButton; importandroid.widget.LinearLayout; importandroid.widget.TextView; importandroid.widget.Toast; publicclassMainActivityextendsActivity{ EditTextet1;//输入用户名的EditText EditTextet2;//输入密码的EditText ImageButtonib;//声明ImageButton Buttonbtn;//重置按钮 Contextcontext; LinearLayoutmLinearLayout;//这个LineatLayout用于放置添加的组件 TextViewtv; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init();//初始化 //单击imagebutton OnClickListenerlistener=newOnClickListener(){ @Override publicvoidonClick(Viewarg0){ //TODOAuto-generatedmethodstub if(et1.getText().toString().equals("android")&&et2.getText().toString().equals("2015")) { ib.setImageResource(R.drawable.state1);//设置改变原来的图片 et1.setVisibility(View.GONE); et2.setVisibility(View.GONE); } else//输入账号或者密码错误的时候 { et2.setText(""); et2.setHint("账号或密码错误"); } } }; ib.setOnClickListener(listener); //长按imagebutton OnLongClickListenerlonglistener=newOnLongClickListener(){ @Override publicbooleanonLongClick(Viewarg0){ //TODOAuto-generatedmethodstub Toast.makeText(context,"动态添加了TextView了哦",Toast.LENGTH_SHORT); tv=newTextView(context); tv.setText("这里是动态添加的TextView"); mLinearLayout.addView(tv);//添加组件 returnfalse; } }; ib.setOnLongClickListener(longlistener); //重置 OnClickListenerlistener2=newOnClickListener(){ @Override publicvoidonClick(Viewarg0){ //TODOAuto-generatedmethodstub ib.setImageResource(R.drawable.state2); et1.setHint("请输入用户名"); et2.setHint("请输入密码"); et1.setText(""); et2.setText(""); et2.requestFocus();//将光标定位EditText et1.setVisibility(View.VISIBLE); et2.setVisibility(View.VISIBLE); mLinearLayout.removeAllViews();//点击重置按钮的时候，也将原来添加的组件一起清除 } }; btn.setOnClickListener(listener2); } //初始化函数 publicvoidinit() { et1=(EditText)findViewById(R.id.et_username); et2=(EditText)findViewById(R.id.et_passward); ib=(ImageButton)findViewById(R.id.ib); btn=(Button)findViewById(R.id.btn); context=MainActivity.this; mLinearLayout=(LinearLayout)findViewById(R.id.linearLayout); } }

Android开发中button按钮的使用及动态添加组件方法示例

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