android的基本操作.doc

android:layout_below=@id/text//位于指定控件下方 页面间的信息传输 第一个页面 Intent in=new?Intent(WriteText.this,MainActivity.class); ???????????in.putExtra(wkk, str); ???????????startActivity(in); 跳转目标页面 ? //定义全局变量 Intent?intent; ? intent?= getIntent(); ???????????String ss =?intent.getStringExtra(wkk); ???????????text.setText(ss); ? 弹窗的生命周期 //清单注册 activity android:name=com.example.text.WindowText ????????????android:label=@string/app_name android:theme=@android:style/Theme.Dialog ????????/activity //不需要记住会复制就好 public?class?WindowText?extends?Activity{ ????TextView?textView1; ??? ????public?voidonCreate(Bundle savedInstanceState) { ????????super.onCreate(savedInstanceState); ????????setContentView(R.layout.window); ????????textView1?= (TextView)findViewById(R.id.textView1); ????????textView1.setOnClickListener(new?android.view.View.OnClickListener() { ???????????public?void?onClick(Viewv) { ??????????????AlertDialog.Builder builder =?new?AlertDialog.Builder(WindowText.this); ??????????????builder.setTitle(Hello);//此处为弹窗标题 ??????????????builder.setIcon(R.drawable.ic_launcher); ??????????????builder.setMessage(是否充值1000000000元？);//弹窗内容 ??????????????builder.setPositiveButton(是,?new?OnClickListener() {//选项及点击后执行的代码 ??????????????????public?voidonClick(DialogInterface dialog,?int?which) { ??????????????????} ??????????????}); ??????????????builder.setNegativeButton(确认,?new?OnClickListener() {//选项及点击后执行的代码 ??????????????????public?voidonClick(DialogInterface dialog,?int?which) { ??????????????????} ??????????????}); ??????????????builder.show(); ???????????} ???????}); } } ? ? 设置字体的大小和颜色 style?name=text ????item?name=android:textSizetools:ignore=PxUsage24px/item ????item?name=android:textColor#FF0000/item /style 使用： style=@style/text ? //将图片设置成TextView的背景 android:background=@drawable/aaa ? ? //居中显示 android:gravity=center_vertical|center_horizontal android:gravity=center_vertical??这个的意思是指 限定它里面的内容要垂直居中显示。android:layout_gravity=center_vertical，这个是指它的位置是相对于它父亲的垂直居中。比如：//第一种：里面的内容都要垂直居中显示，是由父类